Home » Mailing lists » Devel » [PATCH 0/7] Containers (V8): Generic Process Containers
[PATCH 0/7] Containers (V8): Generic Process Containers [message #11801] |
Fri, 06 April 2007 23:32 ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
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Senior Member |
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--
This is an update to my multi-hierarchy multi-subsystem generic
process containers patch. Changes since V7 (12th Feb) include:
- Removed the config-time choice of the number of supported
hierarchies - this is now completely dynamic; new hierarchies are
allocated on demand, and freed when no longer in use.
- Subsystems are now registered at compile-time in
linux/container_subsys.h. This allows for faster access to subsystem
state since the id is a compile-time constant, so there's only a
single extra pointer dereference compared to having a pointer directly
in the task_struct. It also avoids wasting space with unused subsystem
pointers.
- Removed the container pointers from container_group - this results
in a structure very similar to Srivatsa Vaddagiri's rcfs
approach. (RCFS uses the nsproxy object rather than the
container_group object; merging container_group and nsproxy would be
pretty straightforward if desired).
- Removed callback_mutex from container subsystem to be purely back in
the cpuset subsystem. Renamed manage_mutex to container_mutex.
- Condensed post_attach_task() into attach_task() now that
callback_mutex is purely within cpuset.c
- Simplified the container_subsys_state reference counting - stricter
rules on liveness make adding reference counts cheaper.
Still TODO:
- decide whether "Containers" is an acceptable name for the system
given its usage by some other development groups, or whether something
else (ProcessSets? ResourceGroups?) would be better
- decide whether merging container_group and nsproxy is desirable
- add a hash-table based lookup for container_group objects.
- use seq_file properly in container tasks files (and also in
cpuset_attach_task) to avoid having to allocate a big array for all
the container's task pointers.
- add back support for the "release agent" functionality
- lots more testing
- define standards for container file names
Generic Process Containers
--------------------------
There have recently been various proposals floating around for
resource management/accounting and other task grouping subsystems in
the kernel, including ResGroups, User BeanCounters, NSProxy
containers, and others. These all need the basic abstraction of being
able to group together multiple processes in an aggregate, in order to
track/limit the resources permitted to those processes, or control
other behaviour of the processes, and all implement this grouping in
different ways.
Already existing in the kernel is the cpuset subsystem; this has a
process grouping mechanism that is mature, tested, and well documented
(particularly with regards to synchronization rules).
This patchset extracts the process grouping code from cpusets into a
generic container system, and makes the cpusets code a client of
the container system.
It also provides several example clients of the container system,
including ResGroups, BeanCounters and namespace proxy.
The change is implemented in three implementation patches, plus four example
subsystems that aren't necessarily intended to be merged as part of
this patch set, but demonstrate the applicability of the framework.
1) extract the process grouping code from cpusets into a standalone system
2) remove the process grouping code from cpusets and hook into the
container system
3) convert the container system to present a generic multi-hierarchy
API, and make cpusets a client of that API
4) example of a simple CPU accounting container subsystem. Useful as a
boilerplate for people implementing their own subsystems.
5) example of implementing ResGroups and its numtasks controller over
generic containers
6) example of implementing BeanCounters and its numfiles counter over
generic containers
7) example of integrating the namespace isolation code (sys_unshare()
or various clone flags) with generic containers, allowing virtual
servers to take advantage of other resource control efforts.
The intention is that the various resource management and
virtualization efforts can also become container clients, with the
result that:
- the userspace APIs are (somewhat) normalised
- it's easier to test out e.g. the ResGroups CPU controller in
conjunction with the BeanCounters memory controller, or use either of
them as the resource-control portion of a virtual server system.
- the additional kernel footprint of any of the competing resource
management systems is substantially reduced, since it doesn't need
to provide process grouping/containment, hence improving their
chances of getting into the kernel
Signed-off-by: Paul Menage <menage@google.com>
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[PATCH 6/7] Containers (V8): BeanCounters over generic process containers [message #11802 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
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Senior Member |
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This patch implements the BeanCounter resource control abstraction
over generic process containers. It contains the beancounter core
code, plus the numfiles resource counter. It doesn't currently contain
any of the memory tracking code or the code for switching beancounter
context in interrupts.
Currently all the beancounters resource counters are lumped into a
single hierarchy; ideally it would be possible for each resource
counter to be a separate container subsystem, allowing them to be
connected to different hierarchies.
---
fs/file_table.c | 11 +
include/bc/beancounter.h | 194 ++++++++++++++++++++
include/bc/misc.h | 27 ++
include/bc/task.h | 64 ++++++
include/linux/container_subsys.h | 6
include/linux/fs.h | 3
include/linux/sched.h | 3
init/Kconfig | 4
init/main.c | 3
kernel/Makefile | 1
kernel/bc/Kconfig | 17 +
kernel/bc/Makefile | 7
kernel/bc/beancounter.c | 368 +++++++++++++++++++++++++++++++++++++++
kernel/bc/misc.c | 57 ++++++
kernel/softirq.c | 7
15 files changed, 771 insertions(+), 1 deletion(-)
Index: container-2.6.20-new/init/Kconfig
============================================================ =======
--- container-2.6.20-new.orig/init/Kconfig
+++ container-2.6.20-new/init/Kconfig
@@ -607,6 +607,10 @@ config STOP_MACHINE
Need stop_machine() primitive.
endmenu
+menu "Beancounters"
+source "kernel/bc/Kconfig"
+endmenu
+
menu "Block layer"
source "block/Kconfig"
endmenu
Index: container-2.6.20-new/kernel/Makefile
============================================================ =======
--- container-2.6.20-new.orig/kernel/Makefile
+++ container-2.6.20-new/kernel/Makefile
@@ -12,6 +12,7 @@ obj-y = sched.o fork.o exec_domain.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += time/
+obj-$(CONFIG_BEANCOUNTERS) += bc/
obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
obj-$(CONFIG_LOCKDEP) += lockdep.o
ifeq ($(CONFIG_PROC_FS),y)
Index: container-2.6.20-new/kernel/bc/Kconfig
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/bc/Kconfig
@@ -0,0 +1,17 @@
+config BEANCOUNTERS
+ bool "Enable resource accounting/control"
+ default n
+ select CONTAINERS
+ help
+ When Y this option provides accounting and allows configuring
+ limits for user's consumption of exhaustible system resources.
+ The most important resource controlled by this patch is unswappable
+ memory (either mlock'ed or used by internal kernel structures and
+ buffers). The main goal of this patch is to protect processes
+ from running short of important resources because of accidental
+ misbehavior of processes or malicious activity aiming to ``kill''
+ the system. It's worth mentioning that resource limits configured
+ by setrlimit(2) do not give an acceptable level of protection
+ because they cover only a small fraction of resources and work on a
+ per-process basis. Per-process accounting doesn't prevent malicious
+ users from spawning a lot of resource-consuming processes.
Index: container-2.6.20-new/kernel/bc/Makefile
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/bc/Makefile
@@ -0,0 +1,7 @@
+#
+# kernel/bc/Makefile
+#
+# Copyright (C) 2006 OpenVZ SWsoft Inc.
+#
+
+obj-y = beancounter.o misc.o
Index: container-2.6.20-new/include/bc/beancounter.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/bc/beancounter.h
@@ -0,0 +1,194 @@
+/*
+ * include/bc/beancounter.h
+ *
+ * Copyright (C) 2006 OpenVZ SWsoft Inc
+ *
+ */
+
+#ifndef __BEANCOUNTER_H__
+#define __BEANCOUNTER_H__
+
+#include <linux/container.h>
+
+enum {
+ BC_KMEMSIZE,
+ BC_PRIVVMPAGES,
+ BC_PHYSPAGES,
+ BC_NUMTASKS,
+ BC_NUMFILES,
+
+ BC_RESOURCES
+};
+
+struct bc_resource_parm {
+ unsigned long barrier;
+ unsigned long limit;
+ unsigned long held;
+ unsigned long minheld;
+ unsigned long maxheld;
+ unsigned long failcnt;
+
+};
+
+#ifdef __KERNEL__
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/configfs.h>
+#include <asm/atomic.h>
+
+#define BC_MAXVALUE ((unsigned long)LONG_MAX)
+
+enum bc_severity {
+ BC_BARRIER,
+ BC_LIMIT,
+ BC_FORCE,
+};
+
+struct beancounter;
+
+#ifdef CONFIG_BEANCOUNTERS
+
+enum bc_attr_index {
+ BC_RES_HELD,
+ BC_RES_MAXHELD,
+ BC_RES_MINHELD,
+ BC_RES_BARRIER,
+ BC_RES_LIMIT,
+ BC_RES_FAILCNT,
+
+ BC_ATTRS
+};
+
+struct bc_resource {
+ char *bcr_name;
+ int res_id;
+
+ int (*bcr_init)(struct beancounter *bc, int res);
+ int (*bcr_change)(struct beancounter *bc,
+ unsigned long new_bar, unsigned long new_lim);
+ void (*bcr_barrier_hit)(struct beancounter *bc);
+ int (*bcr_limit_hit)(struct beancounter *bc, unsigned long val,
+ unsigned long flags);
+ void (*bcr_fini)(struct beancounter *bc);
+
+ /* container file handlers */
+ struct cftype cft_attrs[BC_ATTRS];
+};
+
+extern struct bc_resource *bc_resources[];
+extern struct container_subsys bc_subsys;
+
+struct beancounter {
+ struct container_subsys_state css;
+ spinlock_t bc_lock;
+
+ struct bc_resource_parm bc_parms[BC_RESOURCES];
+};
+
+/* Update the beancounter for a container */
+static inline void set_container_bc(struct container *cont,
+ struct beancounter *bc)
+{
+ cont->subsys[bc_subsys.subsys_id] = &bc->css;
+}
+
+/* Retrieve the beancounter for a container */
+static inline struct beancounter *container_bc(struct container *cont)
+{
+ return container_of(container_subsys_state(cont, bc_subsys_id),
+ struct beancounter, css);
+}
+
+/* Retrieve the beancounter for a task */
+static inline struct beancounter *task_bc(struct task_struct *task)
+{
+ return container_of(task_subsys_state(task, bc_subsys_id),
+ struct beancounter, css);
+}
+
+static inline void bc_adjust_maxheld(struct bc_resource_parm *parm)
+{
+ if (parm->maxheld < parm->held)
+ parm->maxheld = parm->held;
+}
+
+static inline void bc_adjust_minheld(struct bc_resource_parm *parm)
+{
+ if (parm->minheld > parm->held)
+ parm->minheld = parm->held;
+}
+
+static inline void bc_init_resource(struct bc_resource_parm *parm,
+ unsigned long bar, unsigned long lim)
+{
+ parm->barrier = bar;
+ parm->limit = lim;
+ parm->held = 0;
+ parm->minheld = 0;
+ parm->maxheld = 0;
+ parm->failcnt = 0;
+}
+
+int bc_change_param(struct beancounter *bc, int res,
+ unsigned long bar, unsigned long lim);
+
+int __must_check bc_charge_locked(struct beancounter *bc, int res_id,
+ unsigned long val, int strict, unsigned long flags);
+static inline int __must_check bc_charge(struct beancounter *bc, int res_id,
+ unsigned long val, int strict)
+{
+ int ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bc->bc_lock, flags);
+ ret = bc_charge_locked(bc, res_id, val, strict, flags);
+ spin_unlock_irqrestore(&bc->bc_lock, flags);
+ return ret;
+}
+
+void bc_uncharge_locked(struct beancounter *bc, int res_id,
+ unsigned long val);
+
+static inline void bc_uncharge(struct beancounter *bc, int res_id,
+ unsigned long val)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&bc->bc_lock, flags);
+ bc_uncharge_locked(bc, res_id, val);
+ spin_unlock_irqrestore(&bc->bc_lock, flags);
+}
+
+void __init bc_register_resource(int res_id, struct bc_resource *br);
+void __init bc_init_early(void);
+#else /* CONFIG_BEANCOUNTERS */
+static inline int __must_check bc_charge_locked(struct beancounter *bc, int res,
+ unsigned long val, int strict, unsigned long flags)
+{
+ return 0;
+}
+
+static inline int __must_check bc_charge(struct beancounter *bc, int res,
+ unsigned long val, int strict)
+{
+ return 0;
+}
+
+static inline void bc_uncharge_locked(struct beancounter *bc, int res,
+ unsigned long val)
+{
+}
+
+static inline void bc_uncharge(struct beancounter *bc, int res,
+ unsigned long val)
+{
+}
+
+static inline void bc_init_early(void)
+{
+}
+#endif /* CONFIG_BEANCOUNTERS */
+#endif /* __KERNEL__ */
+#endif
Index: container-2.6.20-new/init/main.c
============================================================ =======
--- container-2.6.20-new.orig/init/main.c
+++ container-2.6.20-new/init/main.c
@@ -54,6 +54,8 @@
#include <linux/pid_namespace.h>
#include <linux/device.h>
+#include <bc/beancounter.h>
+
#include <asm/io.h>
#include <asm/bugs.h>
#include <asm/setup.h>
@@ -487,6 +489,7 @@ asmlinkage void __init start_kernel(void
extern struct kernel_param __start___param[], __stop___param[];
container_init_early();
+ bc_init_early();
smp_setup_processor_id();
/*
Index: container-2.6.20-new/kernel/bc/beancounter.c
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/bc/beancounter.c
@@ -0,0 +1,368 @@
+/*
+ * kernel/bc/beancounter.c
+ *
+ * Copyright (C) 2006 OpenVZ SWsoft Inc
+ *
+ */
+
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/hash.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/uaccess.h>
+
+#include <bc/beancounter.h>
+
+#define BC_HASH_BITS (8)
+#define BC_HASH_SIZE (1 << BC_HASH_BITS)
+
+static int bc_dummy_init(struct beancounter *bc, int i)
+{
+ bc_init_resource(&bc->bc_parms[i], BC_MAXVALUE, BC_MAXVALUE);
+ return 0;
+}
+
+static struct bc_resource bc_dummy_res = {
+ .bcr_name = "dummy",
+ .bcr_init = bc_dummy_init,
+};
+
+struct bc_resource *bc_resources[BC_RESOURCES] = {
+ [0 ... BC_RESOURCES - 1] = &bc_dummy_res,
+};
+
+struct beancounter init_bc;
+static struct kmem_cache *bc_cache;
+
+static int bc_create(struct container_subsys *ss,
+ struct container *cont)
+{
+ int i;
+ struct beancounter *new_bc;
+
+ if (!cont->parent) {
+ /* Early initialization for top container */
+ set_container_bc(cont, &init_bc);
+ init_bc.css.container = cont;
+ return 0;
+ }
+
+ new_bc = kmem_cache_alloc(bc_cache, GFP_KERNEL);
+ if (!new_bc)
+ return -ENOMEM;
+
+ spin_lock_init(&new_bc->bc_lock);
+
+ for (i = 0; i < BC_RESOURCES; i++) {
+ int err;
+ if ((err = bc_resources[i]->bcr_init(new_bc, i))) {
+ for (i--; i >= 0; i--)
+ if (bc_resources[i]->bcr_fini)
+ bc_resources[i]->bcr_fini(new_bc);
+ kmem_cache_free(bc_cache, new_bc);
+ return err;
+ }
+ }
+
+ new_bc->css.container = cont;
+ set_container_bc(cont, new_bc);
+ return 0;
+}
+
+static void bc_destroy(struct container_subsys *ss,
+ struct container *cont)
+{
+ struct beancounter *bc = container_bc(cont);
+ kmem_cache_free(bc_cache, bc);
+}
+
+int bc_charge_locked(struct beancounter *bc, int res, unsigned long val,
+ int strict, unsigned long flags)
+{
+ struct bc_resource_parm *parm;
+ unsigned long new_held;
+
+ BUG_ON(val > BC_MAXVALUE);
+
+ parm = &bc->bc_parms[res];
+ new_held = parm->held + val;
+
+ switch (strict) {
+ case BC_LIMIT:
+ if (new_held > parm->limit)
+ break;
+ /* fallthrough */
+ case BC_BARRIER:
+ if (new_held > parm->barrier) {
+ if (strict == BC_BARRIER)
+ break;
+ if (parm->held < parm->barrier &&
+ bc_resources[res]->bcr_barrier_hit)
+ bc_resources[res]->bcr_barrier_hit(bc);
+ }
+ /* fallthrough */
+ case BC_FORCE:
+ parm->held = new_held;
+ bc_adjust_maxheld(parm);
+ return 0;
+ default:
+ BUG();
+ }
+
+ if (bc_resources[res]->bcr_limit_hit)
+ return bc_resources[res]->bcr_limit_hit(bc, val, flags);
+
+ parm->failcnt++;
+ return -ENOMEM;
+}
+
+void bc_uncharge_locked(struct beancounter *bc, int res, unsigned long val)
+{
+ struct bc_resource_parm *parm;
+
+ BUG_ON(val > BC_MAXVALUE);
+
+ parm = &bc->bc_parms[res];
+ if (unlikely(val > parm->held)) {
+ printk(KERN_ERR "BC: Uncharging too much of %s: %lu vs %lu\n",
+ bc_resources[res]->bcr_name,
+ val, parm->held);
+ val = parm->held;
+ }
+
+ parm->held -= val;
+ bc_adjust_minheld(parm);
+}
+
+int bc_change_param(struct beancounter *bc, int res,
+ unsigned long bar, unsigned long lim)
+{
+ int ret;
+
+ ret = -EINVAL;
+ if (bar > lim)
+ goto out;
+ if (bar > BC_MAXVALUE || lim > BC_MAXVALUE)
+ goto out;
+
+ ret = 0;
+ spin_lock_irq(&bc->bc_lock);
+ if (bc_resources[res]->bcr_change) {
+ ret = bc_resources[res]->bcr_change(bc, bar, lim);
+ if (ret < 0)
+ goto out_unlock;
+ }
+
+ bc->bc_parms[res].barrier = bar;
+ bc->bc_parms[res].limit = lim;
+
+out_unlock:
+ spin_unlock_irq(&bc->bc_lock);
+out:
+ return ret;
+}
+
+static ssize_t bc_resource_show(struct container *cont, struct cftype *cft,
+ struct file *file, char __user *userbuf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct beancounter *bc = container_bc(cont);
+ int idx = cft->private;
+ struct bc_resource *res = container_of(cft, struct bc_resource,
+ cft_attrs[idx]);
+
+ char *page;
+ ssize_t retval = 0;
+ char *s;
+
+ if (!(page = (char *)__get_free_page(GFP_KERNEL)))
+ return -ENOMEM;
+
+ s = page;
+
+ switch(idx) {
+ case BC_RES_HELD:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].held);
+ break;
+ case BC_RES_BARRIER:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].barrier);
+ break;
+ case BC_RES_LIMIT:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].limit);
+ break;
+ case BC_RES_MAXHELD:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].maxheld);
+ break;
+ case BC_RES_MINHELD:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].minheld);
+ break;
+ case BC_RES_FAILCNT:
+ s += sprintf(page, "%lu\n", bc->bc_parms[res->res_id].failcnt);
+ break;
+ default:
+ retval = -EINVAL;
+ goto out;
+ break;
+ }
+
+ retval = simple_read_from_buffer(userbuf, nbytes, ppos, page, s-page);
+ out:
+ free_page((unsigned long) page);
+ return retval;
+}
+
+static ssize_t bc_resource_store(struct container *cont, struct cftype *cft,
+ struct file *file,
+ const char __user *userbuf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct beancounter *bc = container_bc(cont);
+ int idx = cft->private;
+ struct bc_resource *res = container_of(cft, struct bc_resource,
+ cft_attrs[idx]);
+
+ char buffer[64];
+ unsigned long val;
+ char *end;
+ int ret = 0;
+
+ if (nbytes >= sizeof(buffer))
+ return -E2BIG;
+
+ if (copy_from_user(buffer, userbuf, nbytes))
+ return -EFAULT;
+
+ buffer[nbytes] = 0;
+
+ container_lock();
+
+ if (container_is_removed(cont)) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ ret = -EINVAL;
+ val = simple_strtoul(buffer, &end, 10);
+ if (*end != '\0')
+ goto out_unlock;
+
+ switch (idx) {
+ case BC_RES_BARRIER:
+ ret = bc_change_param(bc, res->res_id,
+ val, bc->bc_parms[res->res_id].limit);
+ break;
+ case BC_RES_LIMIT:
+ ret = bc_change_param(bc, res->res_id,
+ bc->bc_parms[res->res_id].barrier, val);
+ break;
+ }
+
+ if (ret == 0)
+ ret = nbytes;
+
+ out_unlock:
+ container_unlock();
+
+ return ret;
+}
+
+
+
+void __init bc_register_resource(int res_id, struct bc_resource *br)
+{
+ int attr;
+ BUG_ON(bc_resources[res_id] != &bc_dummy_res);
+ BUG_ON(res_id >= BC_RESOURCES);
+
+ bc_resources[res_id] = br;
+ br->res_id = res_id;
+
+ for (attr = 0; attr < BC_ATTRS; attr++) {
+
+ /* Construct a file handler for each attribute of this
+ * resource; the name is of the form
+ * "bc.<resname>.<attrname>" */
+
+ struct cftype *cft = &br->cft_attrs[attr];
+ const char *attrname;
+ cft->private = attr;
+ strcpy(cft->name, "bc.");
+ strcat(cft->name, br->bcr_name);
+ strcat(cft->name, ".");
+ switch (attr) {
+ case BC_RES_HELD:
+ attrname = "held"; break;
+ case BC_RES_BARRIER:
+ attrname = "barrier"; break;
+ case BC_RES_LIMIT:
+ attrname = "limit"; break;
+ case BC_RES_MAXHELD:
+ attrname = "maxheld"; break;
+ case BC_RES_MINHELD:
+ attrname = "minheld"; break;
+ case BC_RES_FAILCNT:
+ attrname = "failcnt"; break;
+ default:
+ BUG();
+ }
+ strcat(cft->name, attrname);
+ cft->read = bc_resource_show;
+ cft->write = bc_resource_store;
+ }
+}
+
+void __init bc_init_early(void)
+{
+ int i;
+
+ spin_lock_init(&init_bc.bc_lock);
+
+ for (i = 0; i < BC_RESOURCES; i++) {
+ init_bc.bc_parms[i].barrier = BC_MAXVALUE;
+ init_bc.bc_parms[i].limit = BC_MAXVALUE;
+
+ }
+}
+
+int __init bc_init_late(void)
+{
+ bc_cache = kmem_cache_create("beancounters",
+ sizeof(struct beancounter), 0,
+ SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL, NULL);
+ return 0;
+}
+
+__initcall(bc_init_late);
+
+static int bc_populate(struct container_subsys *ss, struct container *cont)
+{
+ int err;
+ int attr, res;
+ for (res = 0; res < BC_RESOURCES; res++) {
+ struct bc_resource *bcr = bc_resources[res];
+
+ for (attr = 0; attr < BC_ATTRS; attr++) {
+ struct cftype *cft = &bcr->cft_attrs[attr];
+ if (!cft->name[0]) continue;
+ err = container_add_file(cont, cft);
+ if (err < 0) return err;
+ }
+ }
+ return 0;
+}
+
+struct container_subsys bc_subsys = {
+ .name = "bc",
+ .create = bc_create,
+ .destroy = bc_destroy,
+ .populate = bc_populate,
+ .subsys_id = bc_subsys_id,
+ .early_init = 1,
+};
+
+EXPORT_SYMBOL(bc_resources);
+EXPORT_SYMBOL(init_bc);
+EXPORT_SYMBOL(bc_change_param);
Index: container-2.6.20-new/include/bc/misc.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/bc/misc.h
@@ -0,0 +1,27 @@
+/*
+ * include/bc/misc.h
+ *
+ * Copyright (C) 2006 OpenVZ SWsoft Inc
+ *
+ */
+
+#ifndef __BC_MISC_H__
+#define __BC_MISC_H__
+
+struct file;
+
+#ifdef CONFIG_BEANCOUNTERS
+int __must_check bc_file_charge(struct file *);
+void bc_file_uncharge(struct file *);
+#else
+static inline int __must_check bc_file_charge(struct file *f)
+{
+ return 0;
+}
+
+static inline void bc_file_uncharge(struct file *f)
+{
+}
+#endif
+
+#endif
Index: container-2.6.20-new/kernel/bc/misc.c
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/bc/misc.c
@@ -0,0 +1,57 @@
+
+#include <linux/fs.h>
+#include <bc/beancounter.h>
+#include <bc/task.h>
+
+int bc_file_charge(struct file *file)
+{
+ int sev;
+ struct beancounter *bc;
+
+ rcu_read_lock();
+ bc = get_exec_bc();
+ css_get(&bc->css);
+ rcu_read_unlock();
+
+ sev = (capable(CAP_SYS_ADMIN) ? BC_LIMIT : BC_BARRIER);
+
+ if (bc_charge(bc, BC_NUMFILES, 1, sev)) {
+ css_put(&bc->css);
+ return -EMFILE;
+ }
+
+ file->f_bc = bc;
+ return 0;
+}
+
+void bc_file_uncharge(struct file *file)
+{
+ struct beancounter *bc;
+
+ bc = file->f_bc;
+ bc_uncharge(bc, BC_NUMFILES, 1);
+ css_put(&bc->css);
+}
+
+#define BC_NUMFILES_BARRIER 256
+#define BC_NUMFILES_LIMIT 512
+
+static int bc_files_init(struct beancounter *bc, int i)
+{
+ bc_init_resource(&bc->bc_parms[BC_NUMFILES],
+ BC_NUMFILES_BARRIER, BC_NUMFILES_LIMIT);
+ return 0;
+}
+
+static struct bc_resource bc_files_resource = {
+ .bcr_name = "numfiles",
+ .bcr_init = bc_files_init,
+};
+
+static int __init bc_misc_init_resource(void)
+{
+ bc_register_resource(BC_NUMFILES, &bc_files_resource);
+ return 0;
+}
+
+__initcall(bc_misc_init_resource);
Index: container-2.6.20-new/fs/file_table.c
============================================================ =======
--- container-2.6.20-new.orig/fs/file_table.c
+++ container-2.6.20-new/fs/file_table.c
@@ -22,6 +22,8 @@
#include <linux/sysctl.h>
#include <linux/percpu_counter.h>
+#include <bc/misc.h>
+
#include <asm/atomic.h>
/* sysctl tunables... */
@@ -43,6 +45,7 @@ static inline void file_free_rcu(struct
static inline void file_free(struct file *f)
{
percpu_counter_dec(&nr_files);
+ bc_file_uncharge(f);
call_rcu(&f->f_u.fu_rcuhead, file_free_rcu);
}
@@ -107,8 +110,10 @@ struct file *get_empty_filp(void)
if (f == NULL)
goto fail;
- percpu_counter_inc(&nr_files);
memset(f, 0, sizeof(*f));
+ if (bc_file_charge(f))
+ goto fail_charge;
+ percpu_counter_inc(&nr_files);
if (security_file_alloc(f))
goto fail_sec;
@@ -135,6 +140,10 @@ fail_sec:
file_free(f);
fail:
return NULL;
+
+ fail_charge:
+ kmem_cache_free(filp_cachep, f);
+ return NULL;
}
EXPORT_SYMBOL(get_empty_filp);
Index: container-2.6.20-new/include/linux/fs.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/fs.h
+++ container-2.6.20-new/include/linux/fs.h
@@ -739,6 +739,9 @@ struct file {
spinlock_t f_ep_lock;
#endif /* #ifdef CONFIG_EPOLL */
struct address_space *f_mapping;
+#ifdef CONFIG_BEANCOUNTERS
+ struct beancounter *f_bc;
+#endif
};
extern spinlock_t files_lock;
#define file_list_lock() spin_lock(&files_lock);
Index: container-2.6.20-new/include/bc/task.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/bc/task.h
@@ -0,0 +1,64 @@
+/*
+ * include/bc/task.h
+ *
+ * Copyright (C) 2007 OpenVZ SWsoft Inc
+ * Adapted by Paul Menage <menage@google.com> for generic containers
+ *
+ */
+
+#ifndef __BC_TASK_H__
+#define __BC_TASK_H__
+
+#include <linux/container.h>
+#include <linux/hardirq.h>
+#include <bc/beancounter.h>
+
+struct beancounter;
+struct task_struct;
+
+#ifdef CONFIG_BEANCOUNTERS
+extern struct beancounter init_bc;
+
+extern struct container_subsys bc_subsys;
+
+
+/*
+ * Caller must be in rcu_read safe section or hold task_lock(current)
+ */
+
+static inline struct beancounter *get_exec_bc(void)
+{
+ struct task_struct *tsk;
+
+ if (in_irq())
+ return &init_bc;
+
+ tsk = current;
+ if (tsk->tmp_exec_bc != NULL)
+ return tsk->tmp_exec_bc;
+
+ return task_bc(tsk);
+}
+
+#define set_exec_bc(bc) ({ \
+ struct task_struct *t; \
+ struct beancounter *old; \
+ t = current; \
+ old = t->tmp_exec_bc; \
+ t->tmp_exec_bc = bc; \
+ old; \
+ })
+
+#define reset_exec_bc(old, expected) do { \
+ struct task_struct *t; \
+ t = current; \
+ BUG_ON(t->tmp_exec_bc != expected); \
+ t->tmp_exec_bc = old; \
+ } while (0)
+
+#else
+
+#define set_exec_bc(bc) (NULL)
+#define reset_exec_bc(bc, exp) do { } while (0)
+#endif
+#endif
Index: container-2.6.20-new/include/linux/sched.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/sched.h
+++ container-2.6.20-new/include/linux/sched.h
@@ -1052,6 +1052,9 @@ struct task_struct {
#ifdef CONFIG_FAULT_INJECTION
int make_it_fail;
#endif
+#ifdef CONFIG_BEANCOUNTERS
+ struct beancounter *tmp_exec_bc;
+#endif
};
static inline pid_t process_group(struct task_struct *tsk)
Index: container-2.6.20-new/kernel/softirq.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/softirq.c
+++ container-2.6.20-new/kernel/softirq.c
@@ -18,6 +18,8 @@
#include <linux/rcupdate.h>
#include <linux/smp.h>
+#include <bc/task.h>
+
#include <asm/irq.h>
/*
- No shared variables, all the data are CPU local.
@@ -209,6 +211,7 @@ asmlinkage void __do_softirq(void)
__u32 pending;
int max_restart = MAX_SOFTIRQ_RESTART;
int cpu;
+ struct beancounter *bc;
pending = local_softirq_pending();
account_system_vtime(current);
@@ -225,6 +228,8 @@ restart:
h = softirq_vec;
+ bc = set_exec_bc(&init_bc);
+
do {
if (pending & 1) {
h->action(h);
@@ -234,6 +239,8 @@ restart:
pending >>= 1;
} while (pending);
+ reset_exec_bc(bc, &init_bc);
+
local_irq_disable();
pending = local_softirq_pending();
Index: container-2.6.20-new/include/linux/container_subsys.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/container_subsys.h
+++ container-2.6.20-new/include/linux/container_subsys.h
@@ -23,4 +23,10 @@ SUBSYS(numtasks)
/* */
+#ifdef CONFIG_BEANCOUNTERS
+SUBSYS(bc)
+#endif
+
+/* */
+
/* */
--
|
|
|
[PATCH 4/7] Containers (V8): Simple CPU accounting container subsystem [message #11803 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This example demonstrates how to use the generic container subsystem
for a simple resource tracker that counts, for the processes in a
container, the total CPU time used and the %CPU used in the last
complete 10 second interval.
Portions contributed by Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Paul Menage <menage@google.com>
---
include/linux/container_subsys.h | 6 +
include/linux/cpu_acct.h | 14 ++
init/Kconfig | 7 +
kernel/Makefile | 1
kernel/cpu_acct.c | 204 +++++++++++++++++++++++++++++++++++++++
kernel/sched.c | 14 ++
6 files changed, 243 insertions(+), 3 deletions(-)
Index: container-2.6.20-new/include/linux/cpu_acct.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/linux/cpu_acct.h
@@ -0,0 +1,14 @@
+
+#ifndef _LINUX_CPU_ACCT_H
+#define _LINUX_CPU_ACCT_H
+
+#include <linux/container.h>
+#include <asm/cputime.h>
+
+#ifdef CONFIG_CONTAINER_CPUACCT
+extern void cpuacct_charge(struct task_struct *, cputime_t cputime);
+#else
+static void inline cpuacct_charge(struct task_struct *p, cputime_t cputime) {}
+#endif
+
+#endif
Index: container-2.6.20-new/init/Kconfig
============================================================ =======
--- container-2.6.20-new.orig/init/Kconfig
+++ container-2.6.20-new/init/Kconfig
@@ -278,6 +278,13 @@ config PROC_PID_CPUSET
depends on CPUSETS
default y
+config CONTAINER_CPUACCT
+ bool "Simple CPU accounting container subsystem"
+ select CONTAINERS
+ help
+ Provides a simple Resource Controller for monitoring the
+ total CPU consumed by the tasks in a container
+
config RELAY
bool "Kernel->user space relay support (formerly relayfs)"
help
Index: container-2.6.20-new/kernel/cpu_acct.c
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/cpu_acct.c
@@ -0,0 +1,204 @@
+/*
+ * kernel/cpu_acct.c - CPU accounting container subsystem
+ *
+ * Copyright (C) Google Inc, 2006
+ *
+ * Developed by Paul Menage (menage@google.com) and Balbir Singh
+ * (balbir@in.ibm.com)
+ *
+ */
+
+/*
+ * Container subsystem for reporting total CPU usage of tasks in a
+ * container, along with percentage load over a time interval
+ */
+
+#include <linux/module.h>
+#include <linux/container.h>
+#include <linux/fs.h>
+#include <asm/div64.h>
+
+struct cpuacct {
+ struct container_subsys_state css;
+ spinlock_t lock;
+ /* total time used by this class */
+ cputime64_t time;
+
+ /* time when next load calculation occurs */
+ u64 next_interval_check;
+
+ /* time used in current period */
+ cputime64_t current_interval_time;
+
+ /* time used in last period */
+ cputime64_t last_interval_time;
+};
+
+struct container_subsys cpuacct_subsys;
+
+static inline struct cpuacct *container_ca(struct container *cont)
+{
+ return container_of(container_subsys_state(cont, cpuacct_subsys_id),
+ struct cpuacct, css);
+}
+
+static inline struct cpuacct *task_ca(struct task_struct *task)
+{
+ return container_ca(task_container(task, cpuacct_subsys_id));
+}
+
+#define INTERVAL (HZ * 10)
+
+static inline u64 next_interval_boundary(u64 now) {
+ /* calculate the next interval boundary beyond the
+ * current time */
+ do_div(now, INTERVAL);
+ return (now + 1) * INTERVAL;
+}
+
+static int cpuacct_create(struct container_subsys *ss, struct container *cont)
+{
+ struct cpuacct *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
+ if (!ca)
+ return -ENOMEM;
+ spin_lock_init(&ca->lock);
+ ca->next_interval_check = next_interval_boundary(get_jiffies_64());
+ cont->subsys[cpuacct_subsys.subsys_id] = &ca->css;
+ return 0;
+}
+
+static void cpuacct_destroy(struct container_subsys *ss,
+ struct container *cont)
+{
+ kfree(container_ca(cont));
+}
+
+/* Lazily update the load calculation if necessary. Called with ca locked */
+static void cpuusage_update(struct cpuacct *ca)
+{
+ u64 now = get_jiffies_64();
+ /* If we're not due for an update, return */
+ if (ca->next_interval_check > now)
+ return;
+
+ if (ca->next_interval_check <= (now - INTERVAL)) {
+ /* If it's been more than an interval since the last
+ * check, then catch up - the last interval must have
+ * been zero load */
+ ca->last_interval_time = 0;
+ ca->next_interval_check = next_interval_boundary(now);
+ } else {
+ /* If a steal takes the last interval time negative,
+ * then we just ignore it */
+ if ((s64)ca->current_interval_time > 0) {
+ ca->last_interval_time = ca->current_interval_time;
+ } else {
+ ca->last_interval_time = 0;
+ }
+ ca->next_interval_check += INTERVAL;
+ }
+ ca->current_interval_time = 0;
+}
+
+static ssize_t cpuusage_read(struct container *cont,
+ struct cftype *cft,
+ struct file *file,
+ char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct cpuacct *ca = container_ca(cont);
+ u64 time;
+ char usagebuf[64];
+ char *s = usagebuf;
+
+ spin_lock_irq(&ca->lock);
+ cpuusage_update(ca);
+ time = cputime64_to_jiffies64(ca->time);
+ spin_unlock_irq(&ca->lock);
+
+ /* Convert 64-bit jiffies to seconds */
+ time *= 1000;
+ do_div(time, HZ);
+ s += sprintf(s, "%llu", (unsigned long long) time);
+
+ return simple_read_from_buffer(buf, nbytes, ppos, usagebuf, s - usagebuf);
+}
+
+static ssize_t load_read(struct container *cont,
+ struct cftype *cft,
+ struct file *file,
+ char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct cpuacct *ca = container_ca(cont);
+ u64 time;
+ char usagebuf[64];
+ char *s = usagebuf;
+
+ /* Find the time used in the previous interval */
+ spin_lock_irq(&ca->lock);
+ cpuusage_update(ca);
+ time = cputime64_to_jiffies64(ca->last_interval_time);
+ spin_unlock_irq(&ca->lock);
+
+ /* Convert time to a percentage, to give the load in the
+ * previous period */
+ time *= 100;
+ do_div(time, INTERVAL);
+
+ s += sprintf(s, "%llu", (unsigned long long) time);
+
+ return simple_read_from_buffer(buf, nbytes, ppos, usagebuf, s - usagebuf);
+}
+static struct cftype cft_usage = {
+ .name = "cpuacct.usage",
+ .read = cpuusage_read,
+};
+
+static struct cftype cft_load = {
+ .name = "cpuacct.load",
+ .read = load_read,
+};
+
+static int cpuacct_populate(struct container_subsys *ss,
+ struct container *cont)
+{
+ int err;
+
+ if ((err = container_add_file(cont, &cft_usage)))
+ return err;
+ if ((err = container_add_file(cont, &cft_load)))
+ return err;
+
+ return 0;
+}
+
+
+void cpuacct_charge(struct task_struct *task, cputime_t cputime)
+{
+
+ struct cpuacct *ca;
+ unsigned long flags;
+
+ if (!cpuacct_subsys.active)
+ return;
+ rcu_read_lock();
+ ca = task_ca(task);
+ if (ca) {
+ spin_lock_irqsave(&ca->lock, flags);
+ cpuusage_update(ca);
+ ca->time = cputime64_add(ca->time, cputime);
+ ca->current_interval_time =
+ cputime64_add(ca->current_interval_time, cputime);
+ spin_unlock_irqrestore(&ca->lock, flags);
+ }
+ rcu_read_unlock();
+}
+
+struct container_subsys cpuacct_subsys = {
+ .name = "cpuacct",
+ .create = cpuacct_create,
+ .destroy = cpuacct_destroy,
+ .populate = cpuacct_populate,
+ .subsys_id = cpuacct_subsys_id,
+};
Index: container-2.6.20-new/kernel/Makefile
============================================================ =======
--- container-2.6.20-new.orig/kernel/Makefile
+++ container-2.6.20-new/kernel/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_COMPAT) += compat.o
obj-$(CONFIG_CONTAINERS) += container.o
obj-$(CONFIG_CPUSETS) += cpuset.o
+obj-$(CONFIG_CONTAINER_CPUACCT) += cpu_acct.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
Index: container-2.6.20-new/kernel/sched.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/sched.c
+++ container-2.6.20-new/kernel/sched.c
@@ -52,6 +52,7 @@
#include <linux/tsacct_kern.h>
#include <linux/kprobes.h>
#include <linux/delayacct.h>
+#include <linux/cpu_acct.h>
#include <asm/tlb.h>
#include <asm/unistd.h>
@@ -3066,9 +3067,13 @@ void account_user_time(struct task_struc
{
struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
cputime64_t tmp;
+ struct rq *rq = this_rq();
p->utime = cputime_add(p->utime, cputime);
+ if (p != rq->idle)
+ cpuacct_charge(p, cputime);
+
/* Add user time to cpustat. */
tmp = cputime_to_cputime64(cputime);
if (TASK_NICE(p) > 0)
@@ -3098,9 +3103,10 @@ void account_system_time(struct task_str
cpustat->irq = cputime64_add(cpustat->irq, tmp);
else if (softirq_count())
cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
- else if (p != rq->idle)
+ else if (p != rq->idle) {
cpustat->system = cputime64_add(cpustat->system, tmp);
- else if (atomic_read(&rq->nr_iowait) > 0)
+ cpuacct_charge(p, cputime);
+ } else if (atomic_read(&rq->nr_iowait) > 0)
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
cpustat->idle = cputime64_add(cpustat->idle, tmp);
@@ -3125,8 +3131,10 @@ void account_steal_time(struct task_stru
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
cpustat->idle = cputime64_add(cpustat->idle, tmp);
- } else
+ } else {
cpustat->steal = cputime64_add(cpustat->steal, tmp);
+ cpuacct_charge(p, -tmp);
+ }
}
static void task_running_tick(struct rq *rq, struct task_struct *p)
Index: container-2.6.20-new/include/linux/container_subsys.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/container_subsys.h
+++ container-2.6.20-new/include/linux/con
...
|
|
|
[PATCH 1/7] Containers (V8): Generic container system abstracted from cpusets code [message #11804 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This patch creates a generic process container system based on (and
parallel top) the cpusets code. At a coarse level it was created by
copying kernel/cpuset.c, doing s/cpuset/container/g, and stripping out any
code that was cpuset-specific rather than applicable to any process
container subsystem.
Signed-off-by: Paul Menage <menage@google.com>
---
Documentation/containers.txt | 229 +++++++
fs/proc/base.c | 7
include/linux/container.h | 96 +++
include/linux/sched.h | 5
init/Kconfig | 9
init/main.c | 3
kernel/Makefile | 1
kernel/container.c | 1260 +++++++++++++++++++++++++++++++++++++++++++
kernel/exit.c | 2
kernel/fork.c | 3
10 files changed, 1614 insertions(+), 1 deletion(-)
Index: container-2.6.20-new/fs/proc/base.c
============================================================ =======
--- container-2.6.20-new.orig/fs/proc/base.c
+++ container-2.6.20-new/fs/proc/base.c
@@ -68,6 +68,7 @@
#include <linux/security.h>
#include <linux/ptrace.h>
#include <linux/seccomp.h>
+#include <linux/container.h>
#include <linux/cpuset.h>
#include <linux/audit.h>
#include <linux/poll.h>
@@ -1870,6 +1871,9 @@ static struct pid_entry tgid_base_stuff[
#ifdef CONFIG_CPUSETS
REG("cpuset", S_IRUGO, cpuset),
#endif
+#ifdef CONFIG_CONTAINERS
+ REG("container", S_IRUGO, container),
+#endif
INF("oom_score", S_IRUGO, oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust),
#ifdef CONFIG_AUDITSYSCALL
@@ -2151,6 +2155,9 @@ static struct pid_entry tid_base_stuff[]
#ifdef CONFIG_CPUSETS
REG("cpuset", S_IRUGO, cpuset),
#endif
+#ifdef CONFIG_CONTAINERS
+ REG("container", S_IRUGO, container),
+#endif
INF("oom_score", S_IRUGO, oom_score),
REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust),
#ifdef CONFIG_AUDITSYSCALL
Index: container-2.6.20-new/include/linux/container.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/linux/container.h
@@ -0,0 +1,96 @@
+#ifndef _LINUX_CONTAINER_H
+#define _LINUX_CONTAINER_H
+/*
+ * container interface
+ *
+ * Copyright (C) 2003 BULL SA
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc.
+ *
+ */
+
+#include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/nodemask.h>
+
+#ifdef CONFIG_CONTAINERS
+
+extern int number_of_containers; /* How many containers are defined in system? */
+
+extern int container_init_early(void);
+extern int container_init(void);
+extern void container_init_smp(void);
+extern void container_fork(struct task_struct *p);
+extern void container_exit(struct task_struct *p);
+
+extern struct file_operations proc_container_operations;
+
+extern void container_lock(void);
+extern void container_unlock(void);
+
+extern void container_manage_lock(void);
+extern void container_manage_unlock(void);
+
+struct container {
+ unsigned long flags; /* "unsigned long" so bitops work */
+
+ /*
+ * Count is atomic so can incr (fork) or decr (exit) without a lock.
+ */
+ atomic_t count; /* count tasks using this container */
+
+ /*
+ * We link our 'sibling' struct into our parent's 'children'.
+ * Our children link their 'sibling' into our 'children'.
+ */
+ struct list_head sibling; /* my parent's children */
+ struct list_head children; /* my children */
+
+ struct container *parent; /* my parent */
+ struct dentry *dentry; /* container fs entry */
+};
+
+/* struct cftype:
+ *
+ * The files in the container filesystem mostly have a very simple read/write
+ * handling, some common function will take care of it. Nevertheless some cases
+ * (read tasks) are special and therefore I define this structure for every
+ * kind of file.
+ *
+ *
+ * When reading/writing to a file:
+ * - the container to use in file->f_dentry->d_parent->d_fsdata
+ * - the 'cftype' of the file is file->f_dentry->d_fsdata
+ */
+
+struct inode;
+struct cftype {
+ char *name;
+ int private;
+ int (*open) (struct inode *inode, struct file *file);
+ ssize_t (*read) (struct container *cont, struct cftype *cft,
+ struct file *file,
+ char __user *buf, size_t nbytes, loff_t *ppos);
+ ssize_t (*write) (struct container *cont, struct cftype *cft,
+ struct file *file,
+ const char __user *buf, size_t nbytes, loff_t *ppos);
+ int (*release) (struct inode *inode, struct file *file);
+};
+
+int container_add_file(struct container *cont, const struct cftype *cft);
+
+int container_is_removed(const struct container *cont);
+
+#else /* !CONFIG_CONTAINERS */
+
+static inline int container_init_early(void) { return 0; }
+static inline int container_init(void) { return 0; }
+static inline void container_init_smp(void) {}
+static inline void container_fork(struct task_struct *p) {}
+static inline void container_exit(struct task_struct *p) {}
+
+static inline void container_lock(void) {}
+static inline void container_unlock(void) {}
+
+#endif /* !CONFIG_CONTAINERS */
+
+#endif /* _LINUX_CONTAINER_H */
Index: container-2.6.20-new/include/linux/sched.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/sched.h
+++ container-2.6.20-new/include/linux/sched.h
@@ -743,8 +743,8 @@ extern unsigned int max_cache_size;
struct io_context; /* See blkdev.h */
+struct container;
struct cpuset;
-
#define NGROUPS_SMALL 32
#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t)))
struct group_info {
@@ -1031,6 +1031,9 @@ struct task_struct {
int cpuset_mems_generation;
int cpuset_mem_spread_rotor;
#endif
+#ifdef CONFIG_CONTAINERS
+ struct container *container;
+#endif
struct robust_list_head __user *robust_list;
#ifdef CONFIG_COMPAT
struct compat_robust_list_head __user *compat_robust_list;
Index: container-2.6.20-new/init/Kconfig
============================================================ =======
--- container-2.6.20-new.orig/init/Kconfig
+++ container-2.6.20-new/init/Kconfig
@@ -238,6 +238,15 @@ config IKCONFIG_PROC
This option enables access to the kernel configuration file
through /proc/config.gz.
+config CONTAINERS
+ bool "Container support"
+ help
+ This option will let you create and manage process containers,
+ which can be used to aggregate multiple processes, e.g. for
+ the purposes of resource tracking.
+
+ Say N if unsure
+
config CPUSETS
bool "Cpuset support"
depends on SMP
Index: container-2.6.20-new/init/main.c
============================================================ =======
--- container-2.6.20-new.orig/init/main.c
+++ container-2.6.20-new/init/main.c
@@ -39,6 +39,7 @@
#include <linux/writeback.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
+#include <linux/container.h>
#include <linux/efi.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
@@ -485,6 +486,7 @@ asmlinkage void __init start_kernel(void
char * command_line;
extern struct kernel_param __start___param[], __stop___param[];
+ container_init_early();
smp_setup_processor_id();
/*
@@ -608,6 +610,7 @@ asmlinkage void __init start_kernel(void
#ifdef CONFIG_PROC_FS
proc_root_init();
#endif
+ container_init();
cpuset_init();
taskstats_init_early();
delayacct_init();
Index: container-2.6.20-new/kernel/container.c
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/container.c
@@ -0,0 +1,1260 @@
+/*
+ * kernel/container.c
+ *
+ * Generic process-grouping system.
+ *
+ * Based originally on the cpuset system, extracted by Paul Menage
+ * Copyright (C) 2006 Google, Inc
+ *
+ * Copyright notices from the original cpuset code:
+ * --------------------------------------------------
+ * Copyright (C) 2003 BULL SA.
+ * Copyright (C) 2004-2006 Silicon Graphics, Inc.
+ *
+ * Portions derived from Patrick Mochel's sysfs code.
+ * sysfs is Copyright (c) 2001-3 Patrick Mochel
+ *
+ * 2003-10-10 Written by Simon Derr.
+ * 2003-10-22 Updates by Stephen Hemminger.
+ * 2004 May-July Rework by Paul Jackson.
+ * ---------------------------------------------------
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of the Linux
+ * distribution for more details.
+ */
+
+#include <linux/cpu.h>
+#include <linux/cpumask.h>
+#include <linux/container.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/kmod.h>
+#include <linux/list.h>
+#include <linux/mempolicy.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/pagemap.h>
+#include <linux/proc_fs.h>
+#include <linux/rcupdate.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/backing-dev.h>
+#include <linux/sort.h>
+
+#include <asm/uaccess.h>
+#include <asm/atomic.h>
+#include <linux/mutex.h>
+
+#define CONTAINER_SUPER_MAGIC 0x27e0eb
+
+/*
+ * Tracks how many containers are currently defined in system.
+ * When there is only one container (the root container) we can
+ * short circuit some hooks.
+ */
+int number_of_containers __read_mostly;
+
+/* bits in struct container flags field */
+typedef enum {
+ CONT_REMOVED,
+ CONT_NOTIFY_ON_RELEASE,
+} container_flagbits_t;
+
+/* convenient tests for these bits */
+inline int container_is_removed(const struct container *cont)
+{
+ return test_bit(CONT_REMOVED, &cont->flags);
+}
+
+static inline int notify_on_release(const struct container *cont)
+{
+ return test_bit(CONT_NOTIFY_ON_RELEASE, &cont->flags);
+}
+
+static struct container top_container = {
+ .count = ATOMIC_INIT(0),
+ .sibling = LIST_HEAD_INIT(top_container.sibling),
+ .children = LIST_HEAD_INIT(top_container.children),
+};
+
+static struct vfsmount *container_mount;
+static struct super_block *container_sb;
+
+/*
+ * There is one global container mutexes. We also require taking
+ * task_lock() when dereferencing a tasks container pointer. See "The
+ * task_lock() exception", at the end of this comment.
+ *
+ * A task must hold container_mutex to modify containers.
+ *
+ * Any task can increment and decrement the count field without lock.
+ * So in general, code holding container_mutex can't rely on the count
+ * field not changing. However, if the count goes to zero, then only
+ * attach_task() can increment it again. Because a count of zero
+ * means that no tasks are currently attached, therefore there is no
+ * way a task attached to that container can fork (the other way to
+ * increment the count). So code holding container_mutex can safely
+ * assume that if the count is zero, it will stay zero. Similarly, if
+ * a task holds container_mutex on a container with zero count, it
+ * knows that the container won't be removed, as container_rmdir()
+ * needs that mutex.
+ *
+ * The container_common_file_write handler for operations that modify
+ * the container hierarchy holds container_mutex across the entire operation,
+ * single threading all such container modifications across the system.
+ *
+ * The fork and exit callbacks container_fork() and container_exit(), don't
+ * (usually) take container_mutex. These are the two most performance
+ * critical pieces of code here. The exception occurs on container_exit(),
+ * when a task in a notify_on_release container exits. Then container_mutex
+ * is taken, and if the container count is zero, a usermode call made
+ * to /sbin/container_release_agent with the name of the container (path
+ * relative to the root of container file system) as the argument.
+ *
+ * A container can only be deleted if both its 'count' of using tasks
+ * is zero, and its list of 'children' containers is empty. Since all
+ * tasks in the system use _some_ container, and since there is always at
+ * least one task in the system (init, pid == 1), therefore, top_container
+ * always has either children containers and/or using tasks. So we don't
+ * need a special hack to ensure that top_container cannot be deleted.
+ *
+ * The task_lock() exception
+ *
+ * The need for this exception arises from the action of
+ * attach_task(), which overwrites one tasks container pointer with
+ * another. It does so using container_mutexe, however there are
+ * several performance critical places that need to reference
+ * task->container without the expense of grabbing a system global
+ * mutex. Therefore except as noted below, when dereferencing or, as
+ * in attach_task(), modifying a task'ss container pointer we use
+ * task_lock(), which acts on a spinlock (task->alloc_lock) already in
+ * the task_struct routinely used for such matters.
+ *
+ * P.S. One more locking exception. RCU is used to guard the
+ * update of a tasks container pointer by attach_task()
+ */
+
+static DEFINE_MUTEX(container_mutex);
+
+/*
+ * A couple of forward declarations required, due to cyclic reference loop:
+ * container_mkdir -> container_create -> container_populate_dir -> container_add_file
+ * -> container_create_file -> container_dir_inode_operations -> container_mkdir.
+ */
+
+static int container_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+static int container_rmdir(struct inode *unused_dir, struct dentry *dentry);
+
+static struct backing_dev_info container_backing_dev_info = {
+ .ra_pages = 0, /* No readahead */
+ .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+};
+
+static struct inode *container_new_inode(mode_t mode)
+{
+ struct inode *inode = new_inode(container_sb);
+
+ if (inode) {
+ inode->i_mode = mode;
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_blocks = 0;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ inode->i_mapping->backing_dev_info = &container_backing_dev_info;
+ }
+ return inode;
+}
+
+static void container_diput(struct dentry *dentry, struct inode *inode)
+{
+ /* is dentry a directory ? if so, kfree() associated container */
+ if (S_ISDIR(inode->i_mode)) {
+ struct container *cont = dentry->d_fsdata;
+ BUG_ON(!(container_is_removed(cont)));
+ kfree(cont);
+ }
+ iput(inode);
+}
+
+static struct dentry_operations container_dops = {
+ .d_iput = container_diput,
+};
+
+static struct dentry *container_get_dentry(struct dentry *parent, const char *name)
+{
+ struct dentry *d = lookup_one_len(name, parent, strlen(name));
+ if (!IS_ERR(d))
+ d->d_op = &container_dops;
+ return d;
+}
+
+static void remove_dir(struct dentry *d)
+{
+ struct dentry *parent = dget(d->d_parent);
+
+ d_delete(d);
+ simple_rmdir(parent->d_inode, d);
+ dput(parent);
+}
+
+/*
+ * NOTE : the dentry must have been dget()'ed
+ */
+static void container_d_remove_dir(struct dentry *dentry)
+{
+ struct list_head *node;
+
+ spin_lock(&dcache_lock);
+ node = dentry->d_subdirs.next;
+ while (node != &dentry->d_subdirs) {
+ struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
+ list_del_init(node);
+ if (d->d_inode) {
+ d = dget_locked(d);
+ spin_unlock(&dcache_lock);
+ d_delete(d);
+ simple_unlink(dentry->d_inode, d);
+ dput(d);
+ spin_lock(&dcache_lock);
+ }
+ node = dentry->d_subdirs.next;
+ }
+ list_del_init(&dentry->d_u.d_child);
+ spin_unlock(&dcache_lock);
+ remove_dir(dentry);
+}
+
+static struct super_operations container_ops = {
+ .statfs = simple_statfs,
+ .drop_inode = generic_delete_inode,
+};
+
+static int container_fill_super(struct super_block *sb, void *unused_data,
+ int unused_silent)
+{
+ struct inode *inode;
+ struct dentry *root;
+
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+ sb->s_magic = CONTAINER_SUPER_MAGIC;
+ sb->s_op = &container_ops;
+ container_sb = sb;
+
+ inode = container_new_inode(S_IFDIR | S_IRUGO | S_IXUGO | S_IWUSR);
+ if (inode) {
+ inode->i_op = &simple_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+ /* directories start off with i_nlink == 2 (for "." entry) */
+ inode->i_nlink++;
+ } else {
+ return -ENOMEM;
+ }
+
+ root = d_alloc_root(inode);
+ if (!root) {
+ iput(inode);
+ return -ENOMEM;
+ }
+ sb->s_root = root;
+ return 0;
+}
+
+static int container_get_sb(struct file_system_type *fs_type,
+ int flags, const char *unused_dev_name,
+ void *data, struct vfsmount *mnt)
+{
+ return get_sb_single(fs_type, flags, data, container_fill_super, mnt);
+}
+
+static struct file_system_type container_fs_type = {
+ .name = "container",
+ .get_sb = container_get_sb,
+ .kill_sb = kill_litter_super,
+};
+
+static inline struct container *__d_cont(struct dentry *dentry)
+{
+ return dentry->d_fsdata;
+}
+
+static inline struct cftype *__d_cft(struct dentry *dentry)
+{
+ return dentry->d_fsdata;
+}
+
+/*
+ * Call with container_mutex held. Writes path of container into buf.
+ * Returns 0 on success, -errno on error.
+ */
+
+static int container_path(const struct container *cont, char *buf, int buflen)
+{
+ char *start;
+
+ start = buf + buflen;
+
+ *--start = '\0';
+ for (;;) {
+ int len = cont->dentry->d_name.len;
+ if ((start -= len) < buf)
+ return -ENAMETOOLONG;
+ memcpy(start, cont->dentry->d_name.name, len);
+ cont = cont->parent;
+ if (!cont)
+ break;
+ if (!cont->parent)
+ continue;
+ if (--start < buf)
+ return -ENAMETOOLONG;
+ *start = '/';
+ }
+ memmove(buf, start, buf + buflen - start);
+ return 0;
+}
+
+/*
+ * Notify userspace when a container is released, by running
+ * /sbin/container_release_agent with the name of the container (path
+ * relative to the root of container file system) as the argument.
+ *
+ * Most likely, this user command will try to rmdir this container.
+ *
+ * This races with the possibility that some other task will be
+ * attached to this container before it is removed, or that some other
+ * user task will 'mkdir' a child container of this container. That's ok.
+ * The presumed 'rmdir' will fail quietly if this container is no longer
+ * unused, and this container will be reprieved from its death sentence,
+ * to continue to serve a useful existence. Next time it's released,
+ * we will get notified again, if it still has 'notify_on_release' set.
+ *
+ * The final arg to call_usermodehelper() is 0, which means don't
+ * wait. The separate /sbin/container_release_agent task is forked by
+ * call_usermodehelper(), then control in this thread returns here,
+ * without waiting for the release agent task. We don't bother to
+ * wait because the caller of this routine has no use for the exit
+ * status of the /sbin/container_release_agent task, so no sense holding
+ * our caller up for that.
+ *
+ * When we had only one container mutex, we had to call this
+ * without holding it, to avoid deadlock when call_usermodehelper()
+ * allocated memory. With two locks, we could now call this while
+ * holding container_mutex, but we still don't, so as to minimize
+ * the time container_mutex is held.
+ */
+
+static void container_release_agent(const char *pathbuf)
+{
+ char *argv[3], *envp[3];
+ int i;
+
+ if (!pathbuf)
+ return;
+
+ i = 0;
+ argv[i++] = "/sbin/container_release_agent";
+ argv[i++] = (char *)pathbuf;
+ argv[i] = NULL;
+
+ i = 0;
+ /* minimal command environment */
+ envp[i++] = "HOME=/";
+ envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[i] = NULL;
+
+ call_usermodehelper(argv[0], argv, envp, 0);
+ kfree(pathbuf);
+}
+
+/*
+ * Either cont->count of using tasks transitioned to zero, or the
+ * cont->children list of child containers just became empty. If this
+ * cont is notify_on_release() and now both the user count is zero and
+ * the list of children is empty, prepare container path in a kmalloc'd
+ * buffer, to be returned via ppathbuf, so that the caller can invoke
+ * container_release_agent() with it later on, once container_mutex is dropped.
+ * Call here with container_mutex held.
+ *
+ * This check_for_release() routine is responsible for kmalloc'ing
+ * pathbuf. The above container_release_agent() is responsible for
+ * kfree'ing pathbuf. The caller of these routines is responsible
+ * for providing a pathbuf pointer, initialized to NULL, then
+ * calling check_for_release() with container_mutex held and the address
+ * of the pathbuf pointer, then dropping container_mutex, then calling
+ * container_release_agent() with pathbuf, as set by check_for_release().
+ */
+
+static void check_for_release(struct container *cont, char **ppathbuf)
+{
+ if (notify_on_release(cont) && atomic_read(&cont->count) == 0 &&
+ list_empty(&cont->children)) {
+ char *buf;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return;
+ if (container_path(cont, buf, PAGE_SIZE) < 0)
+ kfree(buf);
+ else
+ *ppathbuf = buf;
+ }
+}
+
+
+/*
+ * update_flag - read a 0 or a 1 in a file and update associated flag
+ * bit: the bit to update (CONT_NOTIFY_ON_RELEASE)
+ * cont: the container to update
+ * buf: the buffer where we read the 0 or 1
+ *
+ * Call with container_mutex held.
+ */
+
+static int update_flag(container_flagbits_t bit, struct container *cont, char *buf)
+{
+ int turning_on;
+
+ turning_on = (simple_strtoul(buf, NULL, 10) != 0);
+
+ if (turning_on)
+ set_bit(bit, &cont->flags);
+ else
+ clear_bit(bit, &cont->flags);
+
+ return 0;
+}
+
+
+/*
+ * Attack task specified by pid in 'pidbuf' to container 'cont', possibly
+ * writing the path of the old container in 'ppathbuf' if it needs to be
+ * notified on release.
+ *
+ * Call holding container_mutex. May take task_lock of the task 'pid'
+ * during call.
+ */
+
+static int attach_task(struct container *cont, char *pidbuf, char **ppathbuf)
+{
+ pid_t pid;
+ struct task_struct *tsk;
+ struct container *oldcont;
+ int retval;
+
+ if (sscanf(pidbuf, "%d", &pid) != 1)
+ return -EIO;
+
+ if (pid) {
+ read_lock(&tasklist_lock);
+
+ tsk = find_task_by_pid(pid);
+ if (!tsk || tsk->flags & PF_EXITING) {
+ read_unlock(&tasklist_lock);
+ return -ESRCH;
+ }
+
+ get_task_struct(tsk);
+ read_unlock(&tasklist_lock);
+
+ if ((current->euid) && (current->euid != tsk->uid)
+ && (current->euid != tsk->suid)) {
+ put_task_struct(tsk);
+ return -EACCES;
+ }
+ } else {
+ tsk = current;
+ get_task_struct(tsk);
+ }
+
+ retval = security_task_setscheduler(tsk, 0, NULL);
+ if (retval) {
+ put_task_struct(tsk);
+ return retval;
+ }
+
+ task_lock(tsk);
+ oldcont = tsk->container;
+ if (!oldcont) {
+ task_unlock(tsk);
+ put_task_struct(tsk);
+ return -ESRCH;
+ }
+ atomic_inc(&cont->count);
+ rcu_assign_pointer(tsk->container, cont);
+ task_unlock(tsk);
+
+ put_task_struct(tsk);
+ synchronize_rcu();
+ if (atomic_dec_and_test(&oldcont->count))
+ check_for_release(oldcont, ppathbuf);
+ return 0;
+}
+
+/* The various types of files and directories in a container file system */
+
+typedef enum {
+ FILE_ROOT,
+ FILE_DIR,
+ FILE_NOTIFY_ON_RELEASE,
+ FILE_TASKLIST,
+} container_filetype_t;
+
+static ssize_t container_common_file_write(struct container *cont,
+ struct cftype *cft,
+ struct file *file,
+ const char __user *userbuf,
+ size_t nbytes, loff_t *unused_ppos)
+{
+ container_filetype_t type = cft->private;
+ char *buffer;
+ char *pathbuf = NULL;
+ int retval = 0;
+
+ /* Crude upper limit on largest legitimate cpulist user might write. */
+ if (nbytes > 100 + 6 * NR_CPUS)
+ return -E2BIG;
+
+ /* +1 for nul-terminator */
+ if ((buffer = kmalloc(nbytes + 1, GFP_KERNEL)) == 0)
+ return -ENOMEM;
+
+ if (copy_from_user(buffer, userbuf, nbytes)) {
+ retval = -EFAULT;
+ goto out1;
+ }
+ buffer[nbytes] = 0; /* nul-terminate */
+
+ mutex_lock(&container_mutex);
+
+ if (container_is_removed(cont)) {
+ retval = -ENODEV;
+ goto out2;
+ }
+
+ switch (type) {
+ case FILE_NOTIFY_ON_RELEASE:
+ retval = update_flag(CONT_NOTIFY_ON_RELEASE, cont, buffer);
+ break;
+ case FILE_TASKLIST:
+ retval = attach_task(cont, buffer, &pathbuf);
+ break;
+ default:
+ retval = -EINVAL;
+ goto out2;
+ }
+
+ if (retval == 0)
+ retval = nbytes;
+out2:
+ mutex_unlock(&container_mutex);
+ container_release_agent(pathbuf);
+out1:
+ kfree(buffer);
+ return retval;
+}
+
+static ssize_t container_file_write(struct file *file, const char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ ssize_t retval = 0;
+ struct cftype *cft = __d_cft(file->f_dentry);
+ struct container *cont = __d_cont(file->f_dentry->d_parent);
+ if (!cft)
+ return -ENODEV;
+
+ /* special function ? */
+ if (cft->write)
+ retval = cft->write(cont, cft, file, buf, nbytes, ppos);
+ else
+ retval = -EINVAL;
+
+ return retval;
+}
+
+static ssize_t container_common_file_read(struct container *cont,
+ struct cftype *cft,
+ struct file *file,
+ char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ container_filetype_t type = cft->private;
+ char *page;
+ ssize_t retval = 0;
+ char *s;
+
+ if (!(page = (char *)__get_free_page(GFP_KERNEL)))
+ return -ENOMEM;
+
+ s = page;
+
+ switch (type) {
+ case FILE_NOTIFY_ON_RELEASE:
+ *s++ = notify_on_release(cont) ? '1' : '0';
+ break;
+ default:
+ retval = -EINVAL;
+ goto out;
+ }
+ *s++ = '\n';
+
+ retval = simple_read_from_buffer(buf, nbytes, ppos, page, s - page);
+out:
+ free_page((unsigned long)page);
+ return retval;
+}
+
+static ssize_t container_file_read(struct file *file, char __user *buf, size_t nbytes,
+ loff_t *ppos)
+{
+ ssize_t retval = 0;
+ struct cftype *cft = __d_cft(file->f_dentry);
+ struct container *cont = __d_cont(file->f_dentry->d_parent);
+ if (!cft)
+ return -ENODEV;
+
+ /* special function ? */
+ if (cft->read)
+ retval = cft->read(cont, cft, file, buf, nbytes, ppos);
+ else
+ retval = -EINVAL;
+
+ return retval;
+}
+
+static int container_file_open(struct inode *inode, struct file *file)
+{
+ int err;
+ struct cftype *cft;
+
+ err = generic_file_open(inode, file);
+ if (err)
+ return err;
+
+ cft = __d_cft(file->f_dentry);
+ if (!cft)
+ return -ENODEV;
+ if (cft->open)
+ err = cft->open(inode, file);
+ else
+ err = 0;
+
+ return err;
+}
+
+static int container_file_release(struct inode *inode, struct file *file)
+{
+ struct cftype *cft = __d_cft(file->f_dentry);
+ if (cft->release)
+ return cft->release(inode, file);
+ return 0;
+}
+
+/*
+ * container_rename - Only allow simple rename of directories in place.
+ */
+static int container_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ if (!S_ISDIR(old_dentry->d_inode->i_mode))
+ return -ENOTDIR;
+ if (new_dentry->d_inode)
+ return -EEXIST;
+ if (old_dir != new_dir)
+ return -EIO;
+ return simple_rename(old_dir, old_dentry, new_dir, new_dentry);
+}
+
+static struct file_operations container_file_operations = {
+ .read = container_file_read,
+ .write = container_file_write,
+ .llseek = generic_file_llseek,
+ .open = container_file_open,
+ .release = container_file_release,
+};
+
+static struct inode_operations container_dir_inode_operations = {
+ .lookup = simple_lookup,
+ .mkdir = container_mkdir,
+ .rmdir = container_rmdir,
+ .rename = container_rename,
+};
+
+static int container_create_file(struct dentry *dentry, int mode)
+{
+ struct inode *inode;
+
+ if (!dentry)
+ return -ENOENT;
+ if (dentry->d_inode)
+ return -EEXIST;
+
+ inode = container_new_inode(mode);
+ if (!inode)
+ return -ENOMEM;
+
+ if (S_ISDIR(mode)) {
+ inode->i_op = &container_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+
+ /* start off with i_nlink == 2 (for "." entry) */
+ inode->i_nlink++;
+ } else if (S_ISREG(mode)) {
+ inode->i_size = 0;
+ inode->i_fop = &container_file_operations;
+ }
+
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+ return 0;
+}
+
+/*
+ * container_create_dir - create a directory for an object.
+ * cont: the container we create the directory for.
+ * It must have a valid ->parent field
+ * And we are going to fill its ->dentry field.
+ * name: The name to give to the container directory. Will be copied.
+ * mode: mode to set on new directory.
+ */
+
+static int container_create_dir(struct container *cont, const char *name, int mode)
+{
+ struct dentry *dentry = NULL;
+ struct dentry *parent;
+ int error = 0;
+
+ parent = cont->parent->dentry;
+ dentry = container_get_dentry(parent, name);
+ if (IS_ERR(dentry))
+ return PTR_ERR(dentry);
+ error = container_create_file(dentry, S_IFDIR | mode);
+ if (!error) {
+ dentry->d_fsdata = cont;
+ parent->d_inode->i_nlink++;
+ cont->dentry = dentry;
+ }
+ dput(dentry);
+
+ return error;
+}
+
+int container_add_file(struct container *cont, const struct cftype *cft)
+{
+ struct dentry *dir = cont->dentry;
+ struct dentry *dentry;
+ int error;
+
+ mutex_lock(&dir->d_inode->i_mutex);
+ dentry = container_get_dentry(dir, cft->name);
+ if (!IS_ERR(dentry)) {
+ error = container_create_file(dentry, 0644 | S_IFREG);
+ if (!error)
+ dentry->d_fsdata = (void *)cft;
+ dput(dentry);
+ } else
+ error = PTR_ERR(dentry);
+ mutex_unlock(&dir->d_inode->i_mutex);
+ return error;
+}
+
+/*
+ * Stuff for reading the 'tasks' file.
+ *
+ * Reading this file can return large amounts of data if a container has
+ * *lots* of attached tasks. So it may need several calls to read(),
+ * but we cannot guarantee that the information we produce is correct
+ * unless we produce it entirely atomically.
+ *
+ * Upon tasks file open(), a struct ctr_struct is allocated, that
+ * will have a pointer to an array (also allocated here). The struct
+ * ctr_struct * is stored in file->private_data. Its resources will
+ * be freed by release() when the file is closed. The array is used
+ * to sprintf the PIDs and then used by read().
+ */
+
+/* containers_tasks_read array */
+
+struct ctr_struct {
+ char *buf;
+ int bufsz;
+};
+
+/*
+ * Load into 'pidarray' up to 'npids' of the tasks using container 'cont'.
+ * Return actual number of pids loaded. No need to task_lock(p)
+ * when reading out p->container, as we don't really care if it changes
+ * on the next cycle, and we are not going to try to dereference it.
+ */
+static int pid_array_load(pid_t *pidarray, int npids, struct container *cont)
+{
+ int n = 0;
+ struct task_struct *g, *p;
+
+ read_lock(&tasklist_lock);
+
+ do_each_thread(g, p) {
+ if (p->container == cont) {
+ pidarray[n++] = pid_nr(task_pid(p));
+ if (unlikely(n == npids))
+ goto array_full;
+ }
+ } while_each_thread(g, p);
+
+array_full:
+ read_unlock(&tasklist_lock);
+ return n;
+}
+
+static int cmppid(const void *a, const void *b)
+{
+ return *(pid_t *)a - *(pid_t *)b;
+}
+
+/*
+ * Convert array 'a' of 'npids' pid_t's to a string of newline separated
+ * decimal pids in 'buf'. Don't write more than 'sz' chars, but return
+ * count 'cnt' of how many chars would be written if buf were large enough.
+ */
+static int pid_array_to_buf(char *buf, int sz, pid_t *a, int npids)
+{
+ int cnt = 0;
+ int i;
+
+ for (i = 0; i < npids; i++)
+ cnt += snprintf(buf + cnt, max(sz - cnt, 0), "%d\n", a[i]);
+ return cnt;
+}
+
+/*
+ * Handle an open on 'tasks' file. Prepare a buffer listing the
+ * process id's of tasks currently attached to the container being opened.
+ *
+ * Does not require any specific container mutexes, and does not take any.
+ */
+static int container_tasks_open(struct inode *unused, struct file *file)
+{
+ struct container *cont = __d_cont(file->f_dentry->d_parent);
+ struct ctr_struct *ctr;
+ pid_t *pidarray;
+ int npids;
+ char c;
+
+ if (!(file->f_mode & FMODE_READ))
+ return 0;
+
+ ctr = kmalloc(sizeof(*ctr), GFP_KERNEL);
+ if (!ctr)
+ goto err0;
+
+ /*
+ * If container gets more users after we read count, we won't have
+ * enough space - tough. This race is indistinguishable to the
+ * caller from the case that the additional container users didn't
+ * show up until sometime later on.
+ */
+ npids = atomic_read(&cont->count);
+ pidarray = kmalloc(npids * sizeof(pid_t), GFP_KERNEL);
+ if (!pidarray)
+ goto err1;
+
+ npids = pid_array_load(pidarray, npids, cont);
+ sort(pidarray, npids, sizeof(pid_t), cmppid, NULL);
+
+ /* Call pid_array_to_buf() twice, first just to get bufsz */
+ ctr->bufsz = pid_array_to_buf(&c, sizeof(c), pidarray, npids) + 1;
+ ctr->buf = kmalloc(ctr->bufsz, GFP_KERNEL);
+ if (!ctr->buf)
+ goto err2;
+ ctr->bufsz = pid_array_to_buf(ctr->buf, ctr->bufsz, pidarray, npids);
+
+ kfree(pidarray);
+ file->private_data = ctr;
+ return 0;
+
+err2:
+ kfree(pidarray);
+err1:
+ kfree(ctr);
+err0:
+ return -ENOMEM;
+}
+
+static ssize_t container_tasks_read(struct container *cont,
+ struct cftype *cft,
+ struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct ctr_struct *ctr = file->private_data;
+
+ if (*ppos + nbytes > ctr->bufsz)
+ nbytes = ctr->bufsz - *ppos;
+ if (copy_to_user(buf, ctr->buf + *ppos, nbytes))
+ return -EFAULT;
+ *ppos += nbytes;
+ return nbytes;
+}
+
+static int container_tasks_release(struct inode *unused_inode, struct file *file)
+{
+ struct ctr_struct *ctr;
+
+ if (file->f_mode & FMODE_READ) {
+ ctr = file->private_data;
+ kfree(ctr->buf);
+ kfree(ctr);
+ }
+ return 0;
+}
+
+/*
+ * for the common functions, 'private' gives the type of file
+ */
+
+static struct cftype cft_tasks = {
+ .name = "tasks",
+ .open = container_tasks_open,
+ .read = container_tasks_read,
+ .write = container_common_file_write,
+ .release = container_tasks_release,
+ .private = FILE_TASKLIST,
+};
+
+static struct cftype cft_notify_on_release = {
+ .name = "notify_on_release",
+ .read = container_common_file_read,
+ .write = container_common_file_write,
+ .private = FILE_NOTIFY_ON_RELEASE,
+};
+
+static int container_populate_dir(struct container *cont)
+{
+ int err;
+
+ if ((err = container_add_file(cont, &cft_notify_on_release)) < 0)
+ return err;
+ if ((err = container_add_file(cont, &cft_tasks)) < 0)
+ return err;
+ return 0;
+}
+
+/*
+ * container_create - create a container
+ * parent: container that will be parent of the new container.
+ * name: name of the new container. Will be strcpy'ed.
+ * mode: mode to set on new inode
+ *
+ * Must be called with the mutex on the parent inode held
+ */
+
+static long container_create(struct container *parent, const char *name, int mode)
+{
+ struct container *cont;
+ int err;
+
+ cont = kmalloc(sizeof(*cont), GFP_KERNEL);
+ if (!cont)
+ return -ENOMEM;
+
+ mutex_lock(&container_mutex);
+ cont->flags = 0;
+ if (notify_on_release(parent))
+ set_bit(CONT_NOTIFY_ON_RELEASE, &cont->flags);
+ atomic_set(&cont->count, 0);
+ INIT_LIST_HEAD(&cont->sibling);
+ INIT_LIST_HEAD(&cont->children);
+
+ cont->parent = parent;
+
+ list_add(&cont->sibling, &cont->parent->children);
+ number_of_containers++;
+
+ err = container_create_dir(cont, name, mode);
+ if (err < 0)
+ goto err_remove;
+
+ /*
+ * Release container_mutex before container_populate_dir() because it
+ * will down() this new directory's i_mutex and if we race with
+ * another mkdir, we might deadlock.
+ */
+ mutex_unlock(&container_mutex);
+
+ err = container_populate_dir(cont);
+ /* If err < 0, we have a half-filled directory - oh well ;) */
+ return 0;
+
+ err_remove:
+ list_del(&cont->sibling);
+ number_of_containers--;
+
+ mutex_unlock(&container_mutex);
+ kfree(cont);
+ return err;
+}
+
+static int container_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ struct container *c_parent = dentry->d_parent->d_fsdata;
+
+ /* the vfs holds inode->i_mutex already */
+ return container_create(c_parent, dentry->d_name.name, mode | S_IFDIR);
+}
+
+static int container_rmdir(struct inode *unused_dir, struct dentry *dentry)
+{
+ struct container *cont = dentry->d_fsdata;
+ struct dentry *d;
+ struct container *parent;
+ char *pathbuf = NULL;
+
+ /* the vfs holds both inode->i_mutex already */
+
+ mutex_lock(&container_mutex);
+ if (atomic_read(&cont->count) > 0) {
+ mutex_unlock(&container_mutex);
+ return -EBUSY;
+ }
+ if (!list_empty(&cont->children)) {
+ mutex_unlock(&container_mutex);
+ return -EBUSY;
+ }
+ parent = cont->parent;
+ set_bit(CONT_REMOVED, &cont->flags);
+ list_del(&cont->sibling); /* delete my sibling from parent->children */
+ spin_lock(&cont->dentry->d_lock);
+ d = dget(cont->dentry);
+ cont->dentry = NULL;
+ spin_unlock(&d->d_lock);
+ container_d_remove_dir(d);
+ dput(d);
+ number_of_containers--;
+
+ if (list_empty(&parent->children))
+ check_for_release(parent, &pathbuf);
+ mutex_unlock(&container_mutex);
+ container_release_agent(pathbuf);
+ return 0;
+}
+
+/*
+ * container_init_early - probably not needed yet, but will be needed
+ * once cpusets are hooked into this code
+ */
+
+int __init container_init_early(void)
+{
+ struct task_struct *tsk = current;
+
+ tsk->container = &top_container;
+ return 0;
+}
+
+/**
+ * container_init - initialize containers at system boot
+ *
+ * Description: Initialize top_container and the container internal file system,
+ **/
+
+int __init container_init(void)
+{
+ struct dentry *root;
+ int err;
+
+ init_task.container = &top_container;
+
+ err = register_filesystem(&container_fs_type);
+ if (err < 0)
+ goto out;
+ container_mount = kern_mount(&container_fs_type);
+ if (IS_ERR(container_mount)) {
+ printk(KERN_ERR "container: could not mount!\n");
+ err = PTR_ERR(container_mount);
+ container_mount = NULL;
+ goto out;
+ }
+ root = container_mount->mnt_sb->s_root;
+ root->d_fsdata = &top_container;
+ root->d_inode->i_nlink++;
+ top_container.dentry = root;
+ root->d_inode->i_op = &container_dir_inode_operations;
+ number_of_containers = 1;
+ err = container_populate_dir(&top_container);
+out:
+ return err;
+}
+
+/**
+ * container_fork - attach newly forked task to its parents container.
+ * @tsk: pointer to task_struct of forking parent process.
+ *
+ * Description: A task inherits its parent's container at fork().
+ *
+ * A pointer to the shared container was automatically copied in fork.c
+ * by dup_task_struct(). However, we ignore that copy, since it was
+ * not made under the protection of task_lock(), so might no longer be
+ * a valid container pointer. attach_task() might have already changed
+ * current->container, allowing the previously referenced container to
+ * be removed and freed. Instead, we task_lock(current) and copy
+ * its present value of current->container for our freshly forked child.
+ *
+ * At the point that container_fork() is called, 'current' is the parent
+ * task, and the passed argument 'child' points to the child task.
+ **/
+
+void container_fork(struct task_struct *child)
+{
+ task_lock(current);
+ child->container = current->container;
+ atomic_inc(&child->container->count);
+ task_unlock(current);
+}
+
+/**
+ * container_exit - detach container from exiting task
+ * @tsk: pointer to task_struct of exiting process
+ *
+ * Description: Detach container from @tsk and release it.
+ *
+ * Note that containers marked notify_on_release force every task in
+ * them to take the global container_mutex mutex when exiting.
+ * This could impact scaling on very large systems. Be reluctant to
+ * use notify_on_release containers where very high task exit scaling
+ * is required on large systems.
+ *
+ * Don't even think about derefencing 'cont' after the container use
+ * count goes to zero, except inside a critical section guarded by
+ * container_mutex. Otherwise a zero container use count is a license
+ * to any other task to nuke the container immediately, via
+ * container_rmdir().
+ *
+ * We don't need to task_lock() this reference to tsk->container,
+ * because tsk is already marked PF_EXITING, so attach_task() won't
+ * mess with it, or task is a failed fork, never visible to attach_task.
+ *
+ * the_top_container_hack:
+ *
+ * Set the exiting tasks container to the root container (top_container).
+ *
+ * Don't leave a task unable to allocate memory, as that is an
+ * accident waiting to happen should someone add a callout in
+ * do_exit() after the container_exit() call that might allocate.
+ * If a task tries to allocate memory with an invalid container,
+ * it will oops in container_update_task_memory_state().
+ *
+ * We call container_exit() while the task is still competent to
+ * handle notify_on_release(), then leave the task attached to
+ * the root container (top_container) for the remainder of its exit.
+ *
+ * To do this properly, we would increment the reference count on
+ * top_container, and near the very end of the kernel/exit.c do_exit()
+ * code we would add a second container function call, to drop that
+ * reference. This would just create an unnecessary hot spot on
+ * the top_container reference count, to no avail.
+ *
+ * Normally, holding a reference to a container without bumping its
+ * count is unsafe. The container could go away, or someone could
+ * attach us to a different container, decrementing the count on
+ * the first container that we never incremented. But in this case,
+ * top_container isn't going away, and either task has PF_EXITING set,
+ * which wards off any attach_task() attempts, or task is a failed
+ * fork, never visible to attach_task.
+ *
+ * Another way to do this would be to set the container pointer
+ * to NULL here, and check in container_update_task_memory_state()
+ * for a NULL pointer. This hack avoids that NULL check, for no
+ * cost (other than this way too long comment ;).
+ **/
+
+void container_exit(struct task_struct *tsk)
+{
+ struct container *cont;
+
+ cont = tsk->container;
+ tsk->container = &top_container; /* the_top_container_hack - see above */
+
+ if (notify_on_release(cont)) {
+ char *pathbuf = NULL;
+
+ mutex_lock(&container_mutex);
+ if (atomic_dec_and_test(&cont->count))
+ check_for_release(cont, &pathbuf);
+ mutex_unlock(&container_mutex);
+ container_release_agent(pathbuf);
+ } else {
+ atomic_dec(&cont->count);
+ }
+}
+
+/*
+ * proc_container_show()
+ * - Print tasks container path into seq_file.
+ * - Used for /proc/<pid>/container.
+ * - No need to task_lock(tsk) on this tsk->container reference, as it
+ * doesn't really matter if tsk->container changes after we read it,
+ * and we take container_mutex, keeping attach_task() from changing it
+ * anyway. No need to check that tsk->container != NULL, thanks to
+ * the_top_container_hack in container_exit(), which sets an exiting tasks
+ * container to top_container.
+ */
+static int proc_container_show(struct seq_file *m, void *v)
+{
+ struct pid *pid;
+ struct task_struct *tsk;
+ char *buf;
+ int retval;
+
+ retval = -ENOMEM;
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ goto out;
+
+ retval = -ESRCH;
+ pid = m->private;
+ tsk = get_pid_task(pid, PIDTYPE_PID);
+ if (!tsk)
+ goto out_free;
+
+ retval = -EINVAL;
+ mutex_lock(&container_mutex);
+
+ retval = container_path(tsk->container, buf, PAGE_SIZE);
+ if (retval < 0)
+ goto out_unlock;
+ seq_puts(m, buf);
+ seq_putc(m, '\n');
+out_unlock:
+ mutex_unlock(&container_mutex);
+ put_task_struct(tsk);
+out_free:
+ kfree(buf);
+out:
+ return retval;
+}
+
+static int container_open(struct inode *inode, struct file *file)
+{
+ struct pid *pid = PROC_I(inode)->pid;
+ return single_open(file, proc_container_show, pid);
+}
+
+struct file_operations proc_container_operations = {
+ .open = container_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
Index: container-2.6.20-new/kernel/exit.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/exit.c
+++ container-2.6.20-new/kernel/exit.c
@@ -31,6 +31,7 @@
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
#include <linux/cpuset.h>
+#include <linux/container.h>
#include <linux/syscalls.h>
#include <linux/signal.h>
#include <linux/posix-timers.h>
@@ -927,6 +928,7 @@ fastcall NORET_TYPE void do_exit(long co
__exit_fs(tsk);
exit_thread();
cpuset_exit(tsk);
+ container_exit(tsk);
exit_keys(tsk);
if (group_dead && tsk->signal->leader)
Index: container-2.6.20-new/kernel/fork.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/fork.c
+++ container-2.6.20-new/kernel/fork.c
@@ -31,6 +31,7 @@
#include <linux/capability.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
+#include <linux/container.h>
#include <linux/security.h>
#include <linux/swap.h>
#include <linux/syscalls.h>
@@ -1058,6 +1059,7 @@ static struct task_struct *copy_process(
p->io_context = NULL;
p->io_wait = NULL;
p->audit_context = NULL;
+ container_fork(p);
cpuset_fork(p);
#ifdef CONFIG_NUMA
p->mempolicy = mpol_copy(p->mempolicy);
@@ -1291,6 +1293,7 @@ bad_fork_cleanup_policy:
bad_fork_cleanup_cpuset:
#endif
cpuset_exit(p);
+ container_exit(p);
bad_fork_cleanup_delays_binfmt:
delayacct_tsk_free(p);
if (p->binfmt)
Index: container-2.6.20-new/kernel/Makefile
============================================================ =======
--- container-2.6.20-new.orig/kernel/Makefile
+++ container-2.6.20-new/kernel/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_PM) += power/
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_COMPAT) += compat.o
+obj-$(CONFIG_CONTAINERS) += container.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
Index: container-2.6.20-new/Documentation/containers.txt
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/Documentation/containers.txt
@@ -0,0 +1,229 @@
+ CONTAINERS
+ -------
+
+Written by Paul Menage <menage@google.com> based on Documentation/cpusets.txt
+
+Original copyright in cpusets.txt:
+Portions Copyright (C) 2004 BULL SA.
+Portions Copyright (c) 2004-2006 Silicon Graphics, Inc.
+Modified by Paul Jackson <pj@sgi.com>
+Modified by Christoph Lameter <clameter@sgi.com>
+
+CONTENTS:
+=========
+
+1. Containers
+ 1.1 What are containers ?
+ 1.2 Why are containers needed ?
+ 1.3 How are containers implemented ?
+ 1.4 What does notify_on_release do ?
+ 1.5 How do I use containers ?
+2. Usage Examples and Syntax
+ 2.1 Basic Usage
+ 2.2 Attaching processes
+3. Questions
+4. Contact
+
+1. Containers
+==========
+
+1.1 What are containers ?
+----------------------
+
+Containers provide a mechanism for aggregating sets of tasks, and all
+their children, into hierarchical groups.
+
+Each task has a pointer to a container. Multiple tasks may reference
+the same container. User level code may create and destroy containers
+by name in the container virtual file system, specify and query to
+which container a task is assigned, and list the task pids assigned to
+a container.
+
+On their own, the only use for containers is for simple job
+tracking. The intention is that other subsystems, such as cpusets (see
+Documentation/cpusets.txt) hook into the generic container support to
+provide new attributes for containers, such as accounting/limiting the
+resources which processes in a container can access.
+
+1.2 Why are containers needed ?
+----------------------------
+
+There are multiple efforts to provide process aggregations in the
+Linux kernel, mainly for resource tracking purposes. Such efforts
+include cpusets, CKRM/ResGroups, and UserBeanCounters. These all
+require the basic notion of a grouping of processes, with newly forked
+processes ending in the same group (container) as their parent
+process.
+
+The kernel container patch provides the minimum essential kernel
+mechanisms required to efficiently implement such groups. It has
+minimal impact on the system fast paths, and provides hooks for
+specific subsystems such as cpusets to provide additional behaviour as
+desired.
+
+
+1.3 How are containers implemented ?
+---------------------------------
+
+Containers extends the kernel as follows:
+
+ - Each task in the system is attached to a container, via a pointer
+ in the task structure to a reference counted container structure.
+ - The hierarchy of containers can be mounted at /dev/container (or
+ elsewhere), for browsing and manipulation from user space.
+ - You can list all the tasks (by pid) attached to any container.
+
+The implementation of containers requires a few, simple hooks
+into the rest of the kernel, none in performance critical paths:
+
+ - in init/main.c, to initialize the root container at system boot.
+ - in fork and exit, to attach and detach a task from its container.
+
+In addition a new file system, of type "container" may be mounted,
+typically at /dev/container, to enable browsing and modifying the containers
+presently known to the kernel. No new system calls are added for
+containers - all support for querying and modifying containers is via
+this container file system.
+
+Each task under /proc has an added file named 'container', displaying
+the container name, as the path relative to the root of the container file
+system.
+
+Each container is represented by a directory in the container file system
+containing the following files describing that container:
+
+ - tasks: list of tasks (by pid) attached to that container
+ - notify_on_release flag: run /sbin/container_release_agent on exit?
+
+Other subsystems such as cpusets may add additional files in each
+container dir
+
+New containers are created using the mkdir system call or shell
+command. The properties of a container, such as its flags, are
+modified by writing to the appropriate file in that containers
+directory, as listed above.
+
+The named hierarchical structure of nested containers allows partitioning
+a large system into nested, dynamically changeable, "soft-partitions".
+
+The attachment of each task, automatically inherited at fork by any
+children of that task, to a container allows organizing the work load
+on a system into related sets of tasks. A task may be re-attached to
+any other container, if allowed by the permissions on the necessary
+container file system directories.
+
+The use of a Linux virtual file system (vfs) to represent the
+container hierarchy provides for a familiar permission and name space
+for containers, with a minimum of additional kernel code.
+
+1.4 What does notify_on_release do ?
+------------------------------------
+
+If the notify_on_release flag is enabled (1) in a container, then whenever
+the last task in the container leaves (exits or attaches to some other
+container) and the last child container of that container is removed, then
+the kernel runs the command /sbin/container_release_agent, supplying the
+pathname (relative to the mount point of the container file system) of the
+abandoned container. This enables automatic removal of abandoned containers.
+The default value of notify_on_release in the root container at system
+boot is disabled (0). The default value of other containers at creation
+is the current value of their parents notify_on_release setting.
+
+1.5 How do I use containers ?
+--------------------------
+
+To start a new job that is to be contained within a container, the steps are:
+
+ 1) mkdir /dev/container
+ 2) mount -t container container /dev/container
+ 3) Create the new container by doing mkdir's and write's (or echo's) in
+ the /dev/container virtual file system.
+ 4) Start a task that will be the "founding father" of the new job.
+ 5) Attach that task to the new container by writing its pid to the
+ /dev/container tasks file for that container.
+ 6) fork, exec or clone the job tasks from this founding father task.
+
+For example, the following sequence of commands will setup a container
+named "Charlie", containing just CPUs 2 and 3, and Memory Node 1,
+and then start a subshell 'sh' in that container:
+
+ mount -t container none /dev/container
+ cd /dev/container
+ mkdir Charlie
+ cd Charlie
+ /bin/echo $$ > tasks
+ sh
+ # The subshell 'sh' is now running in container Charlie
+ # The next line should display '/Charlie'
+ cat /proc/self/container
+
+In the future, a C library interface to containers will likely be
+available. For now, the only way to query or modify containers is
+via the container file system, using the various cd, mkdir, echo, cat,
+rmdir commands from the shell, or their equivalent from C.
+
+2. Usage Examples and Syntax
+============================
+
+2.1 Basic Usage
+---------------
+
+Creating, modifying, using the containers can be done through the container
+virtual filesystem.
+
+To mount it, type:
+# mount -t container none /dev/container
+
+Then under /dev/container you can find a tree that corresponds to the
+tree of the containers in the system. For instance, /dev/container
+is the container that holds the whole system.
+
+If you want to create a new container under /dev/container:
+# cd /dev/container
+# mkdir my_container
+
+Now you want to do something with this container.
+# cd my_container
+
+In this directory you can find several files:
+# ls
+notify_on_release tasks
+
+Now attach your shell to this container:
+# /bin/echo $$ > tasks
+
+You can also create containers inside your container by using mkdir in this
+directory.
+# mkdir my_sub_cs
+
+To remove a container, just use rmdir:
+# rmdir my_sub_cs
+This will fail if the container is in use (has containers inside, or has
+processes attached).
+
+2.2 Attaching processes
+-----------------------
+
+# /bin/echo PID > tasks
+
+Note that it is PID, not PIDs. You can only attach ONE task at a time.
+If you have several tasks to attach, you have to do it one after another:
+
+# /bin/echo PID1 > tasks
+# /bin/echo PID2 > tasks
+ ...
+# /bin/echo PIDn > tasks
+
+
+3. Questions
+============
+
+Q: what's up with this '/bin/echo' ?
+A: bash's builtin 'echo' command does not check calls to write() against
+ errors. If you use it in the container file system, you won't be
+ able to tell whether a command succeeded or failed.
+
+Q: When I attach processes, only the first of the line gets really attached !
+A: We can only return one error code per call to write(). So you should also
+ put only ONE pid.
+
--
|
|
|
[PATCH 7/7] Containers (V8): Container interface to nsproxy subsystem [message #11805 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This is intended as a simple illustration of how a virtual server
system could be integrated with generic containers, and hence take
advantage of other resource-control efforts. A real implementation
would probably allow parameters such as configuring what kinds of
namespace creations triggered new containers, etc.
When a task enters a new namespace via a clone() or unshare(), a new
container is created and the task moves into it. Developed by Serge
Hallyn <serue@us.ibm.com>, adapted by Paul Menage <menage@google.com>
Signed-off-by: Paul Menage <menage@google.com>
---
include/linux/container_subsys.h | 6 ++
include/linux/nsproxy.h | 6 ++
init/Kconfig | 9 +++
kernel/Makefile | 1
kernel/fork.c | 4 +
kernel/ns_container.c | 99 +++++++++++++++++++++++++++++++++++++++
kernel/nsproxy.c | 6 ++
7 files changed, 131 insertions(+)
Index: container-2.6.20-new/include/linux/nsproxy.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/nsproxy.h
+++ container-2.6.20-new/include/linux/nsproxy.h
@@ -53,4 +53,10 @@ static inline void exit_task_namespaces(
put_nsproxy(ns);
}
}
+#ifdef CONFIG_CONTAINER_NS
+int ns_container_clone(struct task_struct *tsk);
+#else
+static inline int ns_container_clone(struct task_struct *tsk) { return 0; }
+#endif
+
#endif
Index: container-2.6.20-new/kernel/Makefile
============================================================ =======
--- container-2.6.20-new.orig/kernel/Makefile
+++ container-2.6.20-new/kernel/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_COMPAT) += compat.o
obj-$(CONFIG_CONTAINERS) += container.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CONTAINER_CPUACCT) += cpu_acct.o
+obj-$(CONFIG_CONTAINER_NS) += ns_container.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
Index: container-2.6.20-new/kernel/fork.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/fork.c
+++ container-2.6.20-new/kernel/fork.c
@@ -1668,6 +1668,9 @@ asmlinkage long sys_unshare(unsigned lon
err = -ENOMEM;
goto bad_unshare_cleanup_ipc;
}
+ err = ns_container_clone(current);
+ if (err)
+ goto bad_unshare_cleanup_dupns;
}
if (new_fs || new_ns || new_mm || new_fd || new_ulist ||
@@ -1722,6 +1725,7 @@ asmlinkage long sys_unshare(unsigned lon
task_unlock(current);
}
+ bad_unshare_cleanup_dupns:
if (new_nsproxy)
put_nsproxy(new_nsproxy);
Index: container-2.6.20-new/kernel/ns_container.c
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/kernel/ns_container.c
@@ -0,0 +1,99 @@
+/*
+ * ns_container.c - namespace container subsystem
+ *
+ * Copyright IBM, 2006
+ */
+
+#include <linux/module.h>
+#include <linux/container.h>
+#include <linux/fs.h>
+
+struct nscont {
+ struct container_subsys_state css;
+ spinlock_t lock;
+};
+
+struct container_subsys ns_subsys;
+
+static inline struct nscont *container_nscont(struct container *cont)
+{
+ return container_of(container_subsys_state(cont, ns_subsys_id),
+ struct nscont, css);
+}
+
+int ns_container_clone(struct task_struct *tsk)
+{
+ return container_clone(tsk, &ns_subsys);
+}
+
+/*
+ * Rules:
+ * 1. you can only enter a container which is a child of your current
+ * container
+ * 2. you can only place another process into a container if
+ * a. you have CAP_SYS_ADMIN
+ * b. your container is an ancestor of tsk's destination container
+ * (hence either you are in the same container as tsk, or in an
+ * ancestor container thereof)
+ */
+int ns_can_attach(struct container_subsys *ss,
+ struct container *cont, struct task_struct *tsk)
+{
+ struct container *c;
+
+ if (current != tsk) {
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (!container_is_descendant(cont))
+ return -EPERM;
+ }
+
+ if (container_task_count(cont) != 0)
+ return -EPERM;
+
+ c = task_container(tsk, ns_subsys_id);
+ if (c && c != cont->parent)
+ return -EPERM;
+
+ return 0;
+}
+
+/*
+ * Rules: you can only create a container if
+ * 1. you are capable(CAP_SYS_ADMIN)
+ * 2. the target container is a descendant of your own container
+ */
+static int ns_create(struct container_subsys *ss, struct container *cont)
+{
+ struct nscont *ns;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ if (cont->parent && !container_is_descendant(cont))
+ return -EPERM;
+
+ ns = kzalloc(sizeof(*ns), GFP_KERNEL);
+ if (!ns) return -ENOMEM;
+ spin_lock_init(&ns->lock);
+ cont->subsys[ns_subsys.subsys_id] = &ns->css;
+ return 0;
+}
+
+static void ns_destroy(struct container_subsys *ss,
+ struct container *cont)
+{
+ struct nscont *ns = container_nscont(cont);
+ kfree(ns);
+}
+
+struct container_subsys ns_subsys = {
+ .name = "ns",
+ .create = ns_create,
+ .destroy = ns_destroy,
+ .can_attach = ns_can_attach,
+ //.attach = ns_attach,
+ //.post_attach = ns_post_attach,
+ //.populate = ns_populate,
+ .subsys_id = ns_subsys_id,
+};
Index: container-2.6.20-new/kernel/nsproxy.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/nsproxy.c
+++ container-2.6.20-new/kernel/nsproxy.c
@@ -116,10 +116,16 @@ int copy_namespaces(int flags, struct ta
if (err)
goto out_pid;
+ err = ns_container_clone(tsk);
+ if (err)
+ goto out_container;
out:
put_nsproxy(old_ns);
return err;
+ out_container:
+ if (new_ns->pid_ns)
+ put_pid_ns(new_ns->pid_ns);
out_pid:
if (new_ns->ipc_ns)
put_ipc_ns(new_ns->ipc_ns);
Index: container-2.6.20-new/include/linux/container_subsys.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/container_subsys.h
+++ container-2.6.20-new/include/linux/container_subsys.h
@@ -29,4 +29,10 @@ SUBSYS(bc)
/* */
+#ifdef CONFIG_CONTAINER_NS
+SUBSYS(ns)
+#endif
+
+/* */
+
/* */
Index: container-2.6.20-new/init/Kconfig
============================================================ =======
--- container-2.6.20-new.orig/init/Kconfig
+++ container-2.6.20-new/init/Kconfig
@@ -285,6 +285,15 @@ config CONTAINER_CPUACCT
Provides a simple Resource Controller for monitoring the
total CPU consumed by the tasks in a container
+config CONTAINER_NS
+ bool "Namespace container subsystem"
+ select CONTAINERS
+ help
+ Provides a simple namespace container subsystem to
+ provide hierarchical naming of sets of namespaces,
+ for instance virtual servers and checkpoint/restart
+ jobs.
+
config RELAY
bool "Kernel->user space relay support (formerly relayfs)"
help
--
|
|
|
[PATCH 2/7] Containers (V8): Cpusets hooked into containers [message #11806 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This patch removes the process grouping code from the cpusets code,
instead hooking it into the generic container system. This temporarily
adds cpuset-specific code in kernel/container.c, which is removed by
the next patch in the series.
Signed-off-by: Paul Menage <menage@google.com>
---
Documentation/cpusets.txt | 81 +--
fs/proc/base.c | 4
fs/super.c | 5
include/linux/container.h | 10
include/linux/cpuset.h | 16
include/linux/fs.h | 2
include/linux/mempolicy.h | 2
include/linux/sched.h | 4
init/Kconfig | 14
kernel/container.c | 117 ++++
kernel/cpuset.c | 1100 +++++-----------------------------------------
kernel/exit.c | 2
kernel/fork.c | 7
13 files changed, 286 insertions(+), 1078 deletions(-)
Index: container-2.6.20-new/include/linux/container.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/container.h
+++ container-2.6.20-new/include/linux/container.h
@@ -27,9 +27,6 @@ extern struct file_operations proc_conta
extern void container_lock(void);
extern void container_unlock(void);
-extern void container_manage_lock(void);
-extern void container_manage_unlock(void);
-
struct container {
unsigned long flags; /* "unsigned long" so bitops work */
@@ -47,6 +44,10 @@ struct container {
struct container *parent; /* my parent */
struct dentry *dentry; /* container fs entry */
+
+#ifdef CONFIG_CPUSETS
+ struct cpuset *cpuset;
+#endif
};
/* struct cftype:
@@ -79,6 +80,9 @@ struct cftype {
int container_add_file(struct container *cont, const struct cftype *cft);
int container_is_removed(const struct container *cont);
+void container_set_release_agent_path(const char *path);
+
+int container_path(const struct container *cont, char *buf, int buflen);
#else /* !CONFIG_CONTAINERS */
Index: container-2.6.20-new/include/linux/cpuset.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/cpuset.h
+++ container-2.6.20-new/include/linux/cpuset.h
@@ -11,16 +11,15 @@
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>
+#include <linux/container.h>
#ifdef CONFIG_CPUSETS
-extern int number_of_cpusets; /* How many cpusets are defined in system? */
+extern int number_of_cpusets; /* How many cpusets are defined in system? */
extern int cpuset_init_early(void);
extern int cpuset_init(void);
extern void cpuset_init_smp(void);
-extern void cpuset_fork(struct task_struct *p);
-extern void cpuset_exit(struct task_struct *p);
extern cpumask_t cpuset_cpus_allowed(struct task_struct *p);
extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
#define cpuset_current_mems_allowed (current->mems_allowed)
@@ -75,13 +74,20 @@ static inline int cpuset_do_slab_mem_spr
extern void cpuset_track_online_nodes(void);
+extern int cpuset_can_attach_task(struct container *cont,
+ struct task_struct *tsk);
+extern void cpuset_attach_task(struct container *cont,
+ struct container *oldcont,
+ struct task_struct *tsk);
+extern int cpuset_populate_dir(struct container *cont);
+extern int cpuset_create(struct container *cont);
+extern void cpuset_destroy(struct container *cont);
+
#else /* !CONFIG_CPUSETS */
static inline int cpuset_init_early(void) { return 0; }
static inline int cpuset_init(void) { return 0; }
static inline void cpuset_init_smp(void) {}
-static inline void cpuset_fork(struct task_struct *p) {}
-static inline void cpuset_exit(struct task_struct *p) {}
static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
{
Index: container-2.6.20-new/kernel/exit.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/exit.c
+++ container-2.6.20-new/kernel/exit.c
@@ -30,7 +30,6 @@
#include <linux/mempolicy.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
-#include <linux/cpuset.h>
#include <linux/container.h>
#include <linux/syscalls.h>
#include <linux/signal.h>
@@ -927,7 +926,6 @@ fastcall NORET_TYPE void do_exit(long co
__exit_files(tsk);
__exit_fs(tsk);
exit_thread();
- cpuset_exit(tsk);
container_exit(tsk);
exit_keys(tsk);
Index: container-2.6.20-new/kernel/fork.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/fork.c
+++ container-2.6.20-new/kernel/fork.c
@@ -30,7 +30,6 @@
#include <linux/nsproxy.h>
#include <linux/capability.h>
#include <linux/cpu.h>
-#include <linux/cpuset.h>
#include <linux/container.h>
#include <linux/security.h>
#include <linux/swap.h>
@@ -1060,13 +1059,12 @@ static struct task_struct *copy_process(
p->io_wait = NULL;
p->audit_context = NULL;
container_fork(p);
- cpuset_fork(p);
#ifdef CONFIG_NUMA
p->mempolicy = mpol_copy(p->mempolicy);
if (IS_ERR(p->mempolicy)) {
retval = PTR_ERR(p->mempolicy);
p->mempolicy = NULL;
- goto bad_fork_cleanup_cpuset;
+ goto bad_fork_cleanup_container;
}
mpol_fix_fork_child_flag(p);
#endif
@@ -1290,9 +1288,8 @@ bad_fork_cleanup_security:
bad_fork_cleanup_policy:
#ifdef CONFIG_NUMA
mpol_free(p->mempolicy);
-bad_fork_cleanup_cpuset:
+bad_fork_cleanup_container:
#endif
- cpuset_exit(p);
container_exit(p);
bad_fork_cleanup_delays_binfmt:
delayacct_tsk_free(p);
Index: container-2.6.20-new/kernel/container.c
============================================================ =======
--- container-2.6.20-new.orig/kernel/container.c
+++ container-2.6.20-new/kernel/container.c
@@ -55,6 +55,7 @@
#include <linux/time.h>
#include <linux/backing-dev.h>
#include <linux/sort.h>
+#include <linux/cpuset.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
@@ -92,6 +93,18 @@ static struct container top_container =
.children = LIST_HEAD_INIT(top_container.children),
};
+/* The path to use for release notifications. No locking between
+ * setting and use - so if userspace updates this while subcontainers
+ * exist, you could miss a notification */
+static char release_agent_path[PATH_MAX] = "/sbin/container_release_agent";
+
+void container_set_release_agent_path(const char *path)
+{
+ container_lock();
+ strcpy(release_agent_path, path);
+ container_unlock();
+}
+
static struct vfsmount *container_mount;
static struct super_block *container_sb;
@@ -303,7 +316,7 @@ static inline struct cftype *__d_cft(str
* Returns 0 on success, -errno on error.
*/
-static int container_path(const struct container *cont, char *buf, int buflen)
+int container_path(const struct container *cont, char *buf, int buflen)
{
char *start;
@@ -367,7 +380,7 @@ static void container_release_agent(cons
return;
i = 0;
- argv[i++] = "/sbin/container_release_agent";
+ argv[i++] = release_agent_path;
argv[i++] = (char *)pathbuf;
argv[i] = NULL;
@@ -408,6 +421,7 @@ static void check_for_release(struct con
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!buf)
return;
+
if (container_path(cont, buf, PAGE_SIZE) < 0)
kfree(buf);
else
@@ -454,7 +468,7 @@ static int attach_task(struct container
pid_t pid;
struct task_struct *tsk;
struct container *oldcont;
- int retval;
+ int retval = 0;
if (sscanf(pidbuf, "%d", &pid) != 1)
return -EIO;
@@ -481,7 +495,9 @@ static int attach_task(struct container
get_task_struct(tsk);
}
- retval = security_task_setscheduler(tsk, 0, NULL);
+#ifdef CONFIG_CPUSETS
+ retval = cpuset_can_attach_task(cont, tsk);
+#endif
if (retval) {
put_task_struct(tsk);
return retval;
@@ -489,15 +505,19 @@ static int attach_task(struct container
task_lock(tsk);
oldcont = tsk->container;
- if (!oldcont) {
- task_unlock(tsk);
- put_task_struct(tsk);
- return -ESRCH;
+ if (tsk->flags & PF_EXITING) {
+ task_unlock(tsk);
+ put_task_struct(tsk);
+ return -ESRCH;
}
atomic_inc(&cont->count);
rcu_assign_pointer(tsk->container, cont);
task_unlock(tsk);
+#ifdef CONFIG_CPUSETS
+ cpuset_attach_task(cont, oldcont, tsk);
+#endif
+
put_task_struct(tsk);
synchronize_rcu();
if (atomic_dec_and_test(&oldcont->count))
@@ -512,6 +532,7 @@ typedef enum {
FILE_DIR,
FILE_NOTIFY_ON_RELEASE,
FILE_TASKLIST,
+ FILE_RELEASE_AGENT,
} container_filetype_t;
static ssize_t container_common_file_write(struct container *cont,
@@ -525,8 +546,7 @@ static ssize_t container_common_file_wri
char *pathbuf = NULL;
int retval = 0;
- /* Crude upper limit on largest legitimate cpulist user might write. */
- if (nbytes > 100 + 6 * NR_CPUS)
+ if (nbytes >= PATH_MAX)
return -E2BIG;
/* +1 for nul-terminator */
@@ -553,6 +573,20 @@ static ssize_t container_common_file_wri
case FILE_TASKLIST:
retval = attach_task(cont, buffer, &pathbuf);
break;
+ case FILE_RELEASE_AGENT:
+ {
+ if (nbytes < sizeof(release_agent_path)) {
+ /* We never write anything other than '\0'
+ * into the last char of release_agent_path,
+ * so it always remains a NUL-terminated
+ * string */
+ strncpy(release_agent_path, buffer, nbytes);
+ release_agent_path[nbytes] = 0;
+ } else {
+ retval = -ENOSPC;
+ }
+ break;
+ }
default:
retval = -EINVAL;
goto out2;
@@ -606,6 +640,17 @@ static ssize_t container_common_file_rea
case FILE_NOTIFY_ON_RELEASE:
*s++ = notify_on_release(cont) ? '1' : '0';
break;
+ case FILE_RELEASE_AGENT:
+ {
+ size_t n;
+ container_lock();
+ n = strnlen(release_agent_path, sizeof(release_agent_path));
+ n = min(n, (size_t) PAGE_SIZE);
+ strncpy(s, release_agent_path, n);
+ container_unlock();
+ s += n;
+ break;
+ }
default:
retval = -EINVAL;
goto out;
@@ -941,6 +986,13
...
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[PATCH 5/7] Containers (V8): Resource Groups over generic containers [message #11807 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This patch provides the RG core and numtasks controller as container
subsystems, intended as an example of how to implement a more complex
resource control system over generic process containers. The changes
to the core involve primarily removing the group management, task
membership and configfs support and adding interface layers to talk to
the generic container layer instead.
Each resource controller becomes an independent container subsystem;
the RG core is essentially a library that the resource controllers can
use to provide the RG API to userspace. Rather than a single shares
and stats file in each group, there's a <controller>_shares and
a <controller>_stats file, each linked to the appropriate resource
controller.
include/linux/container_subsys.h | 6
include/linux/moduleparam.h | 12 -
include/linux/numtasks.h | 28 ++
include/linux/res_group.h | 86 +++++++
include/linux/res_group_rc.h | 125 ++++++++++
init/Kconfig | 22 +
kernel/Makefile | 1
kernel/fork.c | 7
kernel/res_group/Makefile | 2
kernel/res_group/local.h | 38 +++
kernel/res_group/numtasks.c | 451 +++++++++++++++++++++++++++++++++++++++
kernel/res_group/res_group.c | 135 +++++++++++
kernel/res_group/rgcs.c | 302 ++++++++++++++++++++++++++
kernel/res_group/shares.c | 228 +++++++++++++++++++
14 files changed, 1439 insertions(+), 4 deletions(-)
Index: container-2.6.20-new/include/linux/moduleparam.h
============================================================ =======
--- container-2.6.20-new.orig/include/linux/moduleparam.h
+++ container-2.6.20-new/include/linux/moduleparam.h
@@ -78,11 +78,17 @@ struct kparam_array
/* Helper functions: type is byte, short, ushort, int, uint, long,
ulong, charp, bool or invbool, or XXX if you define param_get_XXX,
param_set_XXX and param_check_XXX. */
-#define module_param_named(name, value, type, perm) \
- param_check_##type(name, &(value)); \
- module_param_call(name, param_set_##type, param_get_##type, &value, perm); \
+#define module_param_named_call(name, value, type, set, perm) \
+ param_check_##type(name, &(value)); \
+ module_param_call(name, set, param_get_##type, &(value), perm); \
__MODULE_PARM_TYPE(name, #type)
+#define module_param_named(name, value, type, perm) \
+ module_param_named_call(name, value, type, param_set_##type, perm)
+
+#define module_param_set_call(name, type, setfn, perm) \
+ module_param_named_call(name, name, type, setfn, perm)
+
#define module_param(name, type, perm) \
module_param_named(name, name, type, perm)
Index: container-2.6.20-new/include/linux/numtasks.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/linux/numtasks.h
@@ -0,0 +1,28 @@
+/* numtasks.h - No. of tasks resource controller for Resource Groups
+ *
+ * Copyright (C) Chandra Seetharaman, IBM Corp. 2003, 2004, 2005
+ *
+ * Provides No. of tasks resource controller for Resource Groups
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#ifndef _LINUX_NUMTASKS_H
+#define _LINUX_NUMTASKS_H
+
+#ifdef CONFIG_RES_GROUPS_NUMTASKS
+#include <linux/res_group_rc.h>
+
+extern int numtasks_allow_fork(struct task_struct *);
+
+#else /* CONFIG_RES_GROUPS_NUMTASKS */
+
+#define numtasks_allow_fork(task) (0)
+
+#endif /* CONFIG_RES_GROUPS_NUMTASKS */
+#endif /* _LINUX_NUMTASKS_H */
Index: container-2.6.20-new/include/linux/res_group.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/linux/res_group.h
@@ -0,0 +1,86 @@
+/*
+ * res_group.h - Header file to be used by Resource Groups
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003, 2004
+ * (C) Shailabh Nagar, IBM Corp. 2003, 2004
+ * (C) Chandra Seetharaman, IBM Corp. 2003, 2004, 2005
+ *
+ * Provides data structures, macros and kernel APIs
+ *
+ * More details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#ifndef _LINUX_RES_GROUP_H
+#define _LINUX_RES_GROUP_H
+
+#ifdef CONFIG_RES_GROUPS
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/kref.h>
+#include <linux/container.h>
+
+#define SHARE_UNCHANGED (-1) /* implicitly specified by userspace,
+ * never stored in a resource group'
+ * shares struct; never displayed */
+#define SHARE_UNSUPPORTED (-2) /* If the resource controller doesn't
+ * support user changing a shares value
+ * it sets the corresponding share
+ * value to UNSUPPORTED when it returns
+ * the newly allocated shares data
+ * structure */
+#define SHARE_DONT_CARE (-3)
+
+#define SHARE_DEFAULT_DIVISOR (100)
+
+#define MAX_DEPTH 5 /* max depth of hierarchy supported */
+
+#define NO_RES_GROUP NULL
+#define NO_SHARE NULL
+#define NO_RES_ID -1 /* Invalid ID */
+
+/*
+ * Share quantities are a child's fraction of the parent's resource
+ * specified by a divisor in the parent and a dividend in the child.
+ *
+ * Shares are represented as a relative quantity between parent and child
+ * to simplify locking when propagating modifications to the shares of a
+ * resource group. Only the parent and the children of the modified
+ * resource group need to be locked.
+*/
+struct res_shares {
+ /* shares only set by userspace */
+ int min_shares; /* minimun fraction of parent's resources allowed */
+ int max_shares; /* maximum fraction of parent's resources allowed */
+ int child_shares_divisor; /* >= 1, may not be DONT_CARE */
+
+ /*
+ * share values invisible to userspace. adjusted when userspace
+ * sets shares
+ */
+ int unused_min_shares;
+ /* 0 <= unused_min_shares <= (child_shares_divisor -
+ * Sum of min_shares of children)
+ */
+ int cur_max_shares; /* max(children's max_shares). need better name */
+
+ /* State maintained by container system - only relevant when
+ * this shares struct is the actual shares struct for a
+ * container */
+ struct container_subsys_state css;
+};
+
+/*
+ * Class is the grouping of tasks with shares of each resource that has
+ * registered a resource controller (see include/linux/res_group_rc.h).
+ */
+
+#define resource_group container
+
+#endif /* CONFIG_RES_GROUPS */
+#endif /* _LINUX_RES_GROUP_H */
Index: container-2.6.20-new/include/linux/res_group_rc.h
============================================================ =======
--- /dev/null
+++ container-2.6.20-new/include/linux/res_group_rc.h
@@ -0,0 +1,125 @@
+/*
+ * res_group_rc.h - Header file to be used by Resource controllers of
+ * Resource Groups
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Shailabh Nagar, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003, 2004, 2005
+ * (C) Vivek Kashyap , IBM Corp. 2004
+ *
+ * Provides data structures, macros and kernel API of Resource Groups for
+ * resource controllers.
+ *
+ * More details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#ifndef _LINUX_RES_GROUP_RC_H
+#define _LINUX_RES_GROUP_RC_H
+
+#include <linux/res_group.h>
+#include <linux/container.h>
+
+struct res_group_cft {
+ struct cftype cft;
+ struct res_controller *ctlr;
+};
+
+struct res_controller {
+ struct container_subsys *subsys;
+ struct res_group_cft shares_cft;
+ struct res_group_cft stats_cft;
+
+ //const char *name;
+ unsigned int ctlr_id;
+
+ /*
+ * Keeps number of references to this controller structure. kref
+ * does not work as we want to be able to allow removal of a
+ * controller even when some resource group are still defined.
+ */
+ atomic_t count;
+
+ /*
+ * Allocate a new shares struct for this resource controller.
+ * Called when registering a resource controller with pre-existing
+ * resource groups and when new resource group is created by the user.
+ */
+ struct res_shares *(*alloc_shares_struct)(struct container *);
+ /* Corresponding free of shares struct for this resource controller */
+ void (*free_shares_struct)(struct res_shares *);
+
+ /* Notifies the controller when the shares are changed */
+ void (*shares_changed)(struct res_shares *);
+
+ /* resource statistics */
+ ssize_t (*show_stats)(struct res_shares *, char *, size_t);
+ int (*reset_stats)(struct res_shares *, const char *);
+
+ /*
+ * move_task is called when a task moves from one resource group to
+ * another. First parameter is the task that is moving, the second
+ * is the resource specific shares of the resource group the task
+ * was in, and the third is the shares of the resource group the
+ * task has moved to.
+ */
+ void (*move_task)(struct task_struct *, struct res_shares *,
+ struct res_shares *);
+};
+
+#define DECLARE_RG_CONTROLLER(_name) \
+struct res_controller _name ## _ctlr; \
+struct container_subsys _name ## _subsys = { \
+ .name = #_name, \
+ .create = res_group_create, \
+ .destroy = res_group_destroy, \
+ .populate = res_group_populate, \
+ .attach = res_group_attach, \
+ .fork = res_group_fork, \
+ .exit = res_group_exit, \
+ \
+ .subsys_id = _name ## _subsys_id, \
+ .private = &_name ## _ctlr, \
+};
+
+extern int res_group_create(struct
...
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Re: [PATCH 4/7] Containers (V8): Simple CPU accounting container subsystem [message #11876 is a reply to message #11803] |
Tue, 10 April 2007 13:16 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Srivatsa Vaddagiri
Messages: 241 Registered: August 2006
|
Senior Member |
|
|
On Fri, Apr 06, 2007 at 04:32:25PM -0700, menage@google.com wrote:
> +struct container_subsys cpuacct_subsys = {
> + .name = "cpuacct",
> + .create = cpuacct_create,
> + .destroy = cpuacct_destroy,
> + .populate = cpuacct_populate,
> + .subsys_id = cpuacct_subsys_id,
> +};
container_register_subsys(&cpuacct_subsys) is missing ..
--
Regards,
vatsa
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Re: [PATCH 2/7] Containers (V8): Cpusets hooked into containers [message #12260 is a reply to message #11806] |
Mon, 23 April 2007 10:52 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Vaidyanathan Srinivas
Messages: 49 Registered: February 2007
|
Member |
|
|
menage@google.com wrote:
> This patch removes the process grouping code from the cpusets code,
> instead hooking it into the generic container system. This temporarily
> adds cpuset-specific code in kernel/container.c, which is removed by
> the next patch in the series.
>
> Signed-off-by: Paul Menage <menage@google.com>
>
[snip]
> Index: container-2.6.20-new/init/Kconfig
> ============================================================ =======
> --- container-2.6.20-new.orig/init/Kconfig
> +++ container-2.6.20-new/init/Kconfig
> @@ -239,17 +239,12 @@ config IKCONFIG_PROC
> through /proc/config.gz.
>
> config CONTAINERS
> - bool "Container support"
> - help
> - This option will let you create and manage process containers,
> - which can be used to aggregate multiple processes, e.g. for
> - the purposes of resource tracking.
> -
> - Say N if unsure
> + bool
Hi Paul,
This looks like some patch generation error. Description for
containers should not be removed after applying this patch.
--Vaidy
>
> config CPUSETS
> bool "Cpuset support"
> depends on SMP
> + select CONTAINERS
> help
> This option will let you create and manage CPUSETs which
> allow dynamically partitioning a system into sets of CPUs and
> @@ -278,6 +273,11 @@ config SYSFS_DEPRECATED
> If you are using a distro that was released in 2006 or later,
> it should be safe to say N here.
>
> +config PROC_PID_CPUSET
> + bool "Include legacy /proc/<pid>/cpuset file"
> + depends on CPUSETS
> + default y
> +
> config RELAY
> bool "Kernel->user space relay support (formerly relayfs)"
> help
[snip]
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Re: [PATCH 0/7] Containers (V8): Generic Process Containers [message #12261 is a reply to message #11801] |
Mon, 23 April 2007 11:07 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) ![Go to next message Go to next message](/theme/ovz3/images/down.png) |
Vaidyanathan Srinivas
Messages: 49 Registered: February 2007
|
Member |
|
|
Hi Paul,
In [patch 3/7] Containers (V8): Add generic multi-subsystem API to
containers, you have forcefully enabled interrupt in
container_init_subsys() with spin_unlock_irq() which breaks on PPC64.
> +static void container_init_subsys(struct container_subsys *ss) {
> + int retval;
> + struct list_head *l;
> + printk(KERN_ERR "Initializing container subsys %s\n",
> ss->name);
> +
> + /* Create the top container state for this subsystem */
> + ss->root = &rootnode;
> + retval = ss->create(ss, dummytop);
> + BUG_ON(retval);
> + init_container_css(ss, dummytop);
> +
> + /* Update all container groups to contain a subsys
> + * pointer to this state - since the subsystem is
> + * newly registered, all tasks and hence all container
> + * groups are in the subsystem's top container. */
> + spin_lock_irq(&container_group_lock);
> + l = &init_container_group.list;
> + do {
> + struct container_group *cg =
> + list_entry(l, struct container_group, list);
> + cg->subsys[ss->subsys_id] =
> dummytop->subsys[ss->subsys_id];
> + l = l->next;
> + } while (l != &init_container_group.list);
> + spin_unlock_irq(&container_group_lock);
Interrupt gets enabled here and on PPC64, the kernel takes a pending
decrementer and crashes because it is too early to handle them.
Use of irqsave and restore routines would fix the problem.
I have included the fix along with minor Kconfig correction.
Also your 3/7 patch did not showup on LKML.
--Vaidy
> +
> + need_forkexit_callback |= ss->fork || ss->exit;
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Re: [ckrm-tech] [PATCH 0/7] Containers (V8): Generic Process Containers [message #12319 is a reply to message #12261] |
Wed, 25 April 2007 05:04 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
On 4/23/07, Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> wrote:
> Hi Paul,
>
> In [patch 3/7] Containers (V8): Add generic multi-subsystem API to
> containers, you have forcefully enabled interrupt in
> container_init_subsys() with spin_unlock_irq() which breaks on PPC64.
>
>
> > +static void container_init_subsys(struct container_subsys *ss) {
> > + int retval;
> > + struct list_head *l;
> > + printk(KERN_ERR "Initializing container subsys %s\n",
> > ss->name);
> > +
> > + /* Create the top container state for this subsystem */
> > + ss->root = &rootnode;
> > + retval = ss->create(ss, dummytop);
> > + BUG_ON(retval);
> > + init_container_css(ss, dummytop);
> > +
> > + /* Update all container groups to contain a subsys
> > + * pointer to this state - since the subsystem is
> > + * newly registered, all tasks and hence all container
> > + * groups are in the subsystem's top container. */
> > + spin_lock_irq(&container_group_lock);
> > + l = &init_container_group.list;
> > + do {
> > + struct container_group *cg =
> > + list_entry(l, struct container_group, list);
> > + cg->subsys[ss->subsys_id] =
> > dummytop->subsys[ss->subsys_id];
> > + l = l->next;
> > + } while (l != &init_container_group.list);
> > + spin_unlock_irq(&container_group_lock);
>
> Interrupt gets enabled here and on PPC64, the kernel takes a pending
> decrementer and crashes because it is too early to handle them.
>
> Use of irqsave and restore routines would fix the problem.
OK, thanks. I'll add that change.
Paul
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[PATCH 3/7] Containers (V8): Add generic multi-subsystem API to containers [message #18099 is a reply to message #11801] |
Fri, 06 April 2007 23:32 ![Go to previous message Go to previous message](/theme/ovz3/images/up.png) |
Paul Menage
Messages: 642 Registered: September 2006
|
Senior Member |
|
|
This patch removes all cpuset-specific knowlege from the container
system, replacing it with a generic API that can be used by multiple
subsystems. Cpusets is adapted to be a container subsystem.
Signed-off-by: Paul Menage <menage@google.com>
---
Documentation/containers.txt | 415 +++++++++--
Documentation/cpusets.txt | 20
include/linux/container.h | 156 +++-
include/linux/container_subsys.h | 14
include/linux/cpuset.h | 14
include/linux/mempolicy.h | 12
include/linux/sched.h | 4
kernel/container.c | 1465 ++++++++++++++++++++++++++++-----------
kernel/cpuset.c | 161 ++--
kernel/exit.c | 2
kernel/fork.c | 9
mm/mempolicy.c | 2
12 files changed, 1712 insertions(+), 562 deletions(-)
Index: container-2.6.20-new/include/linux/container.h
===================================================================
--- container-2.6.20-new.orig/include/linux/container.h
+++ container-2.6.20-new/include/linux/container.h
@@ -9,33 +9,96 @@
*/
#include <linux/sched.h>
+#include <linux/kref.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>
#ifdef CONFIG_CONTAINERS
-extern int number_of_containers; /* How many containers are defined in system? */
+#define SUBSYS(_x) _x ## _subsys_id,
+enum container_subsys_id {
+#include <linux/container_subsys.h>
+ CONTAINER_SUBSYS_COUNT
+};
+#undef SUBSYS
extern int container_init_early(void);
extern int container_init(void);
extern void container_init_smp(void);
extern void container_fork(struct task_struct *p);
-extern void container_exit(struct task_struct *p);
+extern void container_fork_callbacks(struct task_struct *p);
+extern void container_exit(struct task_struct *p, int run_callbacks);
extern struct file_operations proc_container_operations;
extern void container_lock(void);
extern void container_unlock(void);
+struct containerfs_root;
+
+/* Per-subsystem/per-container state maintained by the system. */
+struct container_subsys_state {
+ /* The container that this subsystem is attached to. Useful
+ * for subsystems that want to know about the container
+ * hierarchy structure */
+ struct container *container;
+
+ /* State maintained by the container system to allow
+ * subsystems to be "busy". Should be accessed via css_get()
+ * and css_put() */
+
+ atomic_t refcnt;
+};
+
+/* A container_group is a structure holding pointers to a set of
+ * containers. This saves space in the task struct object and speeds
+ * up fork()/exit(), since a single inc/dec can bump the reference
+ * count on the entire container set for a task. */
+
+struct container_group {
+
+ /* Reference count */
+ struct kref ref;
+
+ /* List running through all container groups */
+ struct list_head list;
+
+ /* Set of subsystem states, one for each subsystem. NULL for
+ * subsystems that aren't part of this hierarchy. These
+ * pointers reduce the number of dereferences required to get
+ * from a task to its state for a given container, but result
+ * in increased space usage if tasks are in wildly different
+ * groupings across different hierarchies. This array is
+ * mostly immutable after creation - a newly registered
+ * subsystem can result in a pointer in this array
+ * transitioning from NULL to non-NULL */
+ struct container_subsys_state *subsys[CONTAINER_SUBSYS_COUNT];
+
+};
+
+/*
+ * Call css_get() to hold a reference on the container;
+ *
+ */
+
+static inline void css_get(struct container_subsys_state *css)
+{
+ atomic_inc(&css->refcnt);
+}
+/*
+ * css_put() should be called to release a reference taken by
+ * css_get()
+ */
+
+static inline void css_put(struct container_subsys_state *css)
+{
+ atomic_dec(&css->refcnt);
+}
+
struct container {
unsigned long flags; /* "unsigned long" so bitops work */
/*
- * Count is atomic so can incr (fork) or decr (exit) without a lock.
- */
- atomic_t count; /* count tasks using this container */
-
- /*
* We link our 'sibling' struct into our parent's 'children'.
* Our children link their 'sibling' into our 'children'.
*/
@@ -43,11 +106,13 @@ struct container {
struct list_head children; /* my children */
struct container *parent; /* my parent */
- struct dentry *dentry; /* container fs entry */
+ struct dentry *dentry; /* container fs entry */
-#ifdef CONFIG_CPUSETS
- struct cpuset *cpuset;
-#endif
+ /* Private pointers for each registered subsystem */
+ struct container_subsys_state *subsys[CONTAINER_SUBSYS_COUNT];
+
+ struct containerfs_root *root;
+ struct container *top_container;
};
/* struct cftype:
@@ -64,8 +129,11 @@ struct container {
*/
struct inode;
+#define MAX_CFTYPE_NAME 64
struct cftype {
- char *name;
+ /* By convention, the name should begin with the name of the
+ * subsystem, followed by a period */
+ char name[MAX_CFTYPE_NAME];
int private;
int (*open) (struct inode *inode, struct file *file);
ssize_t (*read) (struct container *cont, struct cftype *cft,
@@ -77,10 +145,72 @@ struct cftype {
int (*release) (struct inode *inode, struct file *file);
};
+/* Add a new file to the given container directory. Should only be
+ * called by subsystems from within a populate() method */
int container_add_file(struct container *cont, const struct cftype *cft);
int container_is_removed(const struct container *cont);
-void container_set_release_agent_path(const char *path);
+
+int container_path(const struct container *cont, char *buf, int buflen);
+
+int container_task_count(const struct container *cont);
+
+/* Return true if the container is a descendant of the current container */
+int container_is_descendant(const struct container *cont);
+
+/* Container subsystem type. See Documentation/containers.txt for details */
+
+struct container_subsys {
+ int (*create)(struct container_subsys *ss,
+ struct container *cont);
+ void (*destroy)(struct container_subsys *ss, struct container *cont);
+ int (*can_attach)(struct container_subsys *ss,
+ struct container *cont, struct task_struct *tsk);
+ void (*attach)(struct container_subsys *ss, struct container *cont,
+ struct container *old_cont, struct task_struct *tsk);
+ void (*fork)(struct container_subsys *ss, struct task_struct *task);
+ void (*exit)(struct container_subsys *ss, struct task_struct *task);
+ int (*populate)(struct container_subsys *ss,
+ struct container *cont);
+ void (*bind)(struct container_subsys *ss, struct container *root);
+ int subsys_id;
+ int active;
+ int early_init;
+#define MAX_CONTAINER_TYPE_NAMELEN 32
+ const char *name;
+
+ /* Protected by RCU */
+ struct containerfs_root *root;
+
+ struct list_head sibling;
+
+ void *private;
+};
+
+#define SUBSYS(_x) extern struct container_subsys _x ## _subsys;
+#include <linux/container_subsys.h>
+#undef SUBSYS
+
+int container_clone(struct task_struct *tsk, struct container_subsys *ss);
+
+static inline struct container_subsys_state *container_subsys_state(
+ struct container *cont, int subsys_id)
+{
+ return cont->subsys[subsys_id];
+}
+
+static inline struct container* task_container(struct task_struct *task,
+ int subsys_id)
+{
+ return rcu_dereference(
+ task->containers->subsys[subsys_id]->container);
+}
+
+static inline struct container_subsys_state *task_subsys_state(
+ struct task_struct *task, int subsys_id)
+{
+ return rcu_dereference(task->containers->subsys[subsys_id]);
+}
int container_path(const struct container *cont, char *buf, int buflen);
Index: container-2.6.20-new/include/linux/cpuset.h
===================================================================
--- container-2.6.20-new.orig/include/linux/cpuset.h
+++ container-2.6.20-new/include/linux/cpuset.h
@@ -74,14 +74,7 @@ static inline int cpuset_do_slab_mem_spr
extern void cpuset_track_online_nodes(void);
-extern int cpuset_can_attach_task(struct container *cont,
- struct task_struct *tsk);
-extern void cpuset_attach_task(struct container *cont,
- struct container *oldcont,
- struct task_struct *tsk);
-extern int cpuset_populate_dir(struct container *cont);
-extern int cpuset_create(struct container *cont);
-extern void cpuset_destroy(struct container *cont);
+extern int current_cpuset_is_being_rebound(void);
#else /* !CONFIG_CPUSETS */
@@ -152,6 +145,11 @@ static inline int cpuset_do_slab_mem_spr
static inline void cpuset_track_online_nodes(void) {}
+static inline int current_cpuset_is_being_rebound(void)
+{
+ return 0;
+}
+
#endif /* !CONFIG_CPUSETS */
#endif /* _LINUX_CPUSET_H */
Index: container-2.6.20-new/kernel/container.c
===================================================================
--- container-2.6.20-new.orig/kernel/container.c
+++ container-2.6.20-new/kernel/container.c
@@ -55,7 +55,6 @@
#include <linux/time.h>
#include <linux/backing-dev.h>
#include <linux/sort.h>
-#include <linux/cpuset.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
@@ -63,17 +62,59 @@
#define CONTAINER_SUPER_MAGIC 0x27e0eb
-/*
- * Tracks how many containers are currently defined in system.
- * When there is only one container (the root container) we can
- * short circuit some hooks.
+/* Generate an array of container subsystem pointers */
+#define SUBSYS(_x) &_x ## _subsys,
+
+static struct container_subsys *subsys[] = {
+#include <linux/container_subsys.h>
+};
+
+/* A containerfs_root represents the root of a container hierarchy,
+ * and may be associated with a superblock to form an active
+ * hierarchy */
+struct containerfs_root {
+ struct super_block *sb;
+
+ /* The bitmask of subsystems attached to this hierarchy */
+ unsigned long subsys_bits;
+
+ /* A list running through the attached subsystems */
+ struct list_head subsys_list;
+
+ /* The root container for this hierarchy */
+
...
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