[RFC][-mm PATCH 0/8] Memory controller introduction (v3)
Changelog since version 2 1. Improved error handling in mm/memory.c (spotted by YAMAMOTO Takashi) 2. Test results included 3. try_to_free_mem_container_pages() bug fix (sc->may_writepage is now set to !laptop_mode) Changelog since version 1 1. Fixed some compile time errors (in mm/migrate.c from Vaidyanathan S) 2. Fixed a panic seen when LIST_DEBUG is enabled 3. Added a mechanism to control whether we track page cache or both page cache and mapped pages (as requested by Pavel) This patchset implements another version of the memory controller. These patches have been through a big churn, the first set of patches were posted last year and earlier this year at http://lkml.org/lkml/2007/2/19/10 This patchset draws from the patches listed above and from some of the contents of the patches posted by Vaidyanathan for page cache control. http://lkml.org/lkml/2007/6/20/92 At OLS, the resource management BOF, it was discussed that we need to manage RSS and unmapped page cache together. This patchset is a step towards that TODO's 1. Add memory controller water mark support. Reclaim on high water mark 2. Add support for shrinking on limit change 3. Add per zone per container LRU lists (this is being actively worked on by Pavel Emelianov) 4. Make page_referenced() container aware 5. Figure out a better CLUI for the controller 6. Add better statistics In case you have been using/testing the RSS controller, you'll find that this controller works slower than the RSS controller. The reason being that both swap cache and page cache is accounted for, so pages do go out to swap upon reclaim (they cannot live in the swap cache). I've test compiled the framework without the controller enabled, tested the code minimally on a power box. Any test output, feedback, comments, suggestions are welcome! NOTE: We use css_put(), container API. This API is going to change and soon become non-blocking. If you face any problem running this container, please do report it. We expect the new changes to solve problems. To be on the safer side, you could not enable notify_on_release for the memory controller container (which is the default behaviour right now). Using the patches 1. Enable Memory controller configuration 2. Compile and boot the new kernel 3. mount -t container container -o mem_container /container will mount the memory controller to the /container mount point 4. mkdir /container/a 5. echo $$ > /container/a/tasks (add tasks to the new container) 6. echo -n <num_pages> > /container/a/mem_limit example echo -n 204800 > /container/a/mem_limit, sets the limit to 800 MB on a system with 4K page size 7. run tasks, see the memory controller work 8. Report results, provide feedback 9. Develop/use new patches and go to step 1 Test Results Kernbench (run with kernbench -M) Kernbench did not notice any significant slow (or speed up :-)) down due to the memory controller patches Container not limited ---------------------- Average Half Load -j 3 Run: Elapsed Time 902.79 User Time 845.43 System Time 77.378 Percent CPU 102 Context Switches 33438.6 Sleeps 125006 Average Optimal -j 16 Load Run: Elapsed Time 386.56 User Time 684.058 System Time 51.86 Percent CPU 189.8 Context Switches 249568 Sleeps 201478 Container limited to 800 MB --------------------------- Average Half Load -j 3 Run: Elapsed Time 902.036 User Time 844.96 System Time 77.28 Percent CPU 102 Context Switches 34082.8 Sleeps 125713 Average Optimal -j 16 Load Run: Elapsed Time 386.66 User Time 683.962 System Time 51.834 Percent CPU 189.6 Context Switches 246458 Sleeps 198505 Container limited to 400 MB --------------------------- Average Half Load -j 3 Run: Elapsed Time 903.892 User Time 845.002 System Time 77.436 Percent CPU 101.6 Context Switches 32939.4 Sleeps 124572 Average Optimal -j 16 Load Run: Elapsed Time 387.084 User Time 684.064 System Time 51.9 Percent CPU 189.6 Context Switches 250638 Sleeps 203246 Memory controller not compiled in --------------------------------- Average Half Load -j 3 Run: Elapsed Time 888.548 User Time 840.758 System Time 66.274 Percent CPU 101.6 Context Switches 34090.8 Sleeps 125883 Average Optimal -j 16 Load Run: Elapsed Time 378.514 User Time 677.34 System Time 45.41 Percent CPU 190.6 Context Switches 244298 Sleeps 195483 Lmbench Legend ------ 800 ==> Container limited to using 800 MB of memory disabled ==> Memory controller not compiled in enabled ==> Memory controller compiled in but not mounted unlimited ==> Memory controller compiled in and mounted, no memory limit was set The interesting data in the test comes from (1) fork and exec processing times (2) Page fault and mmap latency L M B E N C H 2 . 0 S U M M A R Y ------------------------------------ Basic system parameters ---------------------------------------------------- Host OS Description Mhz --------- ------------- ----------------------- ---- 800 Linux 2.6.22- x86_64-linux-gnu 3597 disabled Linux 2.6.22- x86_64-linux-gnu 3597 enabled Linux 2.6.22- x86_64-linux-gnu 3597 unlimited Linux 2.6.22- x86_64-linux-gnu 3597 Processor, Processes - times in microseconds - smaller is better ---------------------------------------------------------------- Host OS Mhz null null open selct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ---- 800 Linux 2.6.22- 3597 0.18 0.26 1.28 2.29 5.577 0.32 2.97 105. 500. 6351 disabled Linux 2.6.22- 3597 0.18 0.25 1.26 2.29 5.578 0.33 2.96 96.1 436. 6155 enabled Linux 2.6.22- 3597 0.18 0.26 1.27 2.15 5.587 0.32 2.96 105. 469. 6380 unlimited Linux 2.6.22- 3597 0.18 0.26 1.27 2.27 5.580 0.32 2.96 105. 498. 6358 Context switching - times in microseconds - smaller is better ------------------------------------------------------------- Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw --------- ------------- ----- ------ ------ ------ ------ ------- ------- 800 Linux 2.6.22- 7.620 8.6400 10.6 8.4600 14.3 9.10000 17.5 disabled Linux 2.6.22- 7.430 8.2600 11.0 8.4600 15.0 10.2 18.9 enabled Linux 2.6.22- 6.790 8.3900 10.7 9.8300 15.8 10.6 17.2 unlimited Linux 2.6.22- 7.610 8.4700 10.6 10.7 14.9 10.9 17.9 *Local* Communication latencies in microseconds - smaller is better ------------------------------------------------------------------- Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP ctxsw UNIX UDP TCP conn --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- 800 Linux 2.6.22- 7.620 16.8 15.9 26.9 32.4 disabled Linux 2.6.22- 7.430 17.3 14.3 27.3 32.4 enabled Linux 2.6.22- 6.790 14.9 16.8 27.0 48.7 unlimited Linux 2.6.22- 7.610 16.7 17.4 27.1 33.3 File & VM system latencies in microseconds - smaller is better -------------------------------------------------------------- Host OS 0K File 10K File Mmap Prot Page Create Delete Create Delete Latency Fault Fault --------- ------------- ------ ------ ------ ------ ------- ----- ----- 800 Linux 2.6.22- 16.1 9.8000 50.0 23.7 2876.0 0.657 2.00000 disabled Linux 2.6.22- 16.3 9.9090 51.8 22.8 5475.0 0.625 1.00000 enabled Linux 2.6.22- 16.0 9.6860 49.5 23.5 6616.0 0.641 2.00000 unlimited Linux 2.6.22- 16.1 9.7350 49.8 23.6 6629.0 0.646 2.00000 *Local* Communication bandwidths in MB/s - bigger is better ----------------------------------------------------------- Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem UNIX reread reread (libc) (hand) read write --------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- ----- 800 Linux 2.6.22- 1078 468. 911. 2287.2 3665.4 1106.8 1055.0 3658 1599. disabled Linux 2.6.22- 1034 416. 917. 2282.9 3608.4 1113.2 1057.2 3602 1612. enabled Linux 2.6.22- 1077 419. 909. 2285.7 3616.4 1113.8 1066.1 3623 1614. unlimited Linux 2.6.22- 1064 415. 912. 2282.7 3610.6 1108.9 1053.6 3611 1599. Memory latencies in nanoseconds - smaller is better (WARNING - may not be correct, check graphs) --------------------------------------------------- Host OS Mhz L1 $ L2 $ Main mem Guesses --------- ------------- ---- ----- ------ -------- ------- 800 Linux 2.6.22- 3597 1.111 7.7940 56.7 disabled Linux 2.6.22- 3597 1.111 7.8470 57.8 enabled Linux 2.6.22- 3597 1.111 7.8410 57.7 unlimited Linux 2.6.22- 3597 1.111 7.8350 57.8 series res_counters_infra.patch mem-control-setup.patch mem-control-accounting-setup.patch mem-control-accounting.patch mem-control-task-migration.patch mem-control-lru-and-reclaim.patch mem-control-out-of-memory.patch mem-control-choose-rss-vs-rss-and-pagecache.patch -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 1/8] Memory controller resource counters (v3)
From: Pavel Emelianov <xemul@openvz.org> Introduce generic structures and routines for resource accounting. Each resource accounting container is supposed to aggregate it, container_subsystem_state and its resource-specific members within. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/res_counter.h | 102 +++++++++++++++++++++++++++++++++++++ init/Kconfig | 4 + kernel/Makefile | 1 kernel/res_counter.c | 120 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 227 insertions(+) diff -puN /dev/null include/linux/res_counter.h --- /dev/null 2007-06-01 20:42:04.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/res_counter.h 2007-07-20 13:13:24.000000000 +0530 @@ -0,0 +1,102 @@ +#ifndef __RES_COUNTER_H__ +#define __RES_COUNTER_H__ + +/* + * Resource Counters + * Contain common data types and routines for resource accounting + * + * Copyright 2007 OpenVZ SWsoft Inc + * + * Author: Pavel Emelianov <xemul@openvz.org> + * + */ + +#include <linux/container.h> + +/* + * The core object. the container that wishes to account for some + * resource may include this counter into its structures and use + * the helpers described beyond + */ + +struct res_counter { + /* + * the current resource consumption level + */ + unsigned long usage; + /* + * the limit that usage cannot exceed + */ + unsigned long limit; + /* + * the number of unsuccessful attempts to consume the resource + */ + unsigned long failcnt; + /* + * the lock to protect all of the above. + * the routines below consider this to be IRQ-safe + */ + spinlock_t lock; +}; + +/* + * Helpers to interact with userspace + * res_counter_read/_write - put/get the specified fields from the + * res_counter struct to/from the user + * + * @counter: the counter in question + * @member: the field to work with (see RES_xxx below) + * @buf: the buffer to opeate on,... + * @nbytes: its size... + * @pos: and the offset. + */ + +ssize_t res_counter_read(struct res_counter *counter, int member, + const char __user *buf, size_t nbytes, loff_t *pos); +ssize_t res_counter_write(struct res_counter *counter, int member, + const char __user *buf, size_t nbytes, loff_t *pos); + +/* + * the field descriptors. one for each member of res_counter + */ + +enum { + RES_USAGE, + RES_LIMIT, + RES_FAILCNT, +}; + +/* + * helpers for accounting + */ + +void res_counter_init(struct res_counter *counter); + +/* + * charge - try to consume more resource. + * + * @counter: the counter + * @val: the amount of the resource. each controller defines its own + * units, e.g. numbers, bytes, Kbytes, etc + * + * returns 0 on success and <0 if the counter->usage will exceed the + * counter->limit _locked call expects the counter->lock to be taken + */ + +int res_counter_charge_locked(struct res_counter *counter, unsigned long val); +int res_counter_charge(struct res_counter *counter, unsigned long val); + +/* + * uncharge - tell that some portion of the resource is released + * + * @counter: the counter + * @val: the amount of the resource + * + * these calls check for usage underflow and show a warning on the console + * _locked call expects the counter->lock to be taken + */ + +void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val); +void res_counter_uncharge(struct res_counter *counter, unsigned long val); + +#endif diff -puN init/Kconfig~res_counters_infra init/Kconfig --- linux-2.6.22-rc6/init/Kconfig~res_counters_infra 2007-07-20 13:13:24.000000000 +0530 +++ linux-2.6.22-rc6-balbir/init/Kconfig 2007-07-20 13:13:24.000000000 +0530 @@ -320,6 +320,10 @@ config CPUSETS Say N if unsure. +config RESOURCE_COUNTERS + bool + select CONTAINERS + config SYSFS_DEPRECATED bool "Create deprecated sysfs files" default y diff -puN kernel/Makefile~res_counters_infra kernel/Makefile --- linux-2.6.22-rc6/kernel/Makefile~res_counters_infra 2007-07-20 13:13:24.000000000 +0530 +++ linux-2.6.22-rc6-balbir/kernel/Makefile 2007-07-20 13:13:24.000000000 +0530 @@ -58,6 +58,7 @@ obj-$(CONFIG_RELAY) += relay.o obj-$(CONFIG_SYSCTL) += utsname_sysctl.o obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o +obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y) # According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is diff -puN /dev/null kernel/res_counter.c --- /dev/null 2007-06-01 20:42:04.000000000 +0530 +++ linux-2.6.22-rc6-balbir/kernel/res_counter.c 2007-07-20 13:13:24.000000000 +0530 @@ -0,0 +1,120 @@ +/* + * resource containers + * + * Copyright 2007 OpenVZ SWsoft Inc + * + * Author: Pavel Emelianov <xemul@openvz.org> + * + */ + +#include <linux/types.h> +#include <linux/parser.h> +#include <linux/fs.h> +#include <linux/res_counter.h> +#include <linux/uaccess.h> + +void res_counter_init(struct res_counter *counter) +{ + spin_lock_init(&counter->lock); + counter->limit = (unsigned long)LONG_MAX; +} + +int res_counter_charge_locked(struct res_counter *counter, unsigned long val) +{ + if (counter->usage > (counter->limit - val)) { + counter->failcnt++; + return -ENOMEM; + } + + counter->usage += val; + return 0; +} + +int res_counter_charge(struct res_counter *counter, unsigned long val) +{ + int ret; + unsigned long flags; + + spin_lock_irqsave(&counter->lock, flags); + ret = res_counter_charge_locked(counter, val); + spin_unlock_irqrestore(&counter->lock, flags); + return ret; +} + +void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val) +{ + if (WARN_ON(counter->usage < val)) + val = counter->usage; + + counter->usage -= val; +} + +void res_counter_uncharge(struct res_counter *counter, unsigned long val) +{ + unsigned long flags; + + spin_lock_irqsave(&counter->lock, flags); + res_counter_uncharge_locked(counter, val); + spin_unlock_irqrestore(&counter->lock, flags); +} + + +static inline unsigned long *res_counter_member(struct res_counter *counter, + int member) +{ + switch (member) { + case RES_USAGE: + return &counter->usage; + case RES_LIMIT: + return &counter->limit; + case RES_FAILCNT: + return &counter->failcnt; + }; + + BUG(); + return NULL; +} + +ssize_t res_counter_read(struct res_counter *counter, int member, + const char __user *userbuf, size_t nbytes, loff_t *pos) +{ + unsigned long *val; + char buf[64], *s; + + s = buf; + val = res_counter_member(counter, member); + s += sprintf(s, "%lu\n", *val); + return simple_read_from_buffer((void __user *)userbuf, nbytes, + pos, buf, s - buf); +} + +ssize_t res_counter_write(struct res_counter *counter, int member, + const char __user *userbuf, size_t nbytes, loff_t *pos) +{ + int ret; + char *buf, *end; + unsigned long tmp, *val; + + buf = kmalloc(nbytes + 1, GFP_KERNEL); + ret = -ENOMEM; + if (buf == NULL) + goto out; + + buf[nbytes] = '\0'; + ret = -EFAULT; + if (copy_from_user(buf, userbuf, nbytes)) + goto out_free; + + ret = -EINVAL; + tmp = simple_strtoul(buf, &end, 10); + if (*end != '\0') + goto out_free; + + val = res_counter_member(counter, member); + *val = tmp; + ret = nbytes; +out_free: + kfree(buf); +out: + return ret; +} _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 2/8] Memory controller containers setup (v3)
Setup the memory container and add basic hooks and controls to integrate and work with the container. Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/container_subsys.h | 6 + include/linux/memcontrol.h | 21 +++++ init/Kconfig | 8 ++ mm/Makefile | 1 mm/memcontrol.c | 143 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 179 insertions(+) diff -puN include/linux/container_subsys.h~mem-control-setup include/linux/container_subsys.h --- linux-2.6.22-rc6/include/linux/container_subsys.h~mem-control-setup 2007-07-20 13:13:24.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/container_subsys.h 2007-07-20 13:13:24.000000000 +0530 @@ -30,3 +30,9 @@ SUBSYS(ns) #endif /* */ + +#ifdef CONFIG_CONTAINER_MEM_CONT +SUBSYS(mem_container) +#endif + +/* */ diff -puN init/Kconfig~mem-control-setup init/Kconfig --- linux-2.6.22-rc6/init/Kconfig~mem-control-setup 2007-07-20 13:13:24.000000000 +0530 +++ linux-2.6.22-rc6-balbir/init/Kconfig 2007-07-20 13:13:24.000000000 +0530 @@ -360,6 +360,14 @@ config CONTAINER_NS for instance virtual servers and checkpoint/restart jobs. +config CONTAINER_MEM_CONT + bool "Memory controller for containers" + select CONTAINERS + select RESOURCE_COUNTERS + help + Provides a memory controller that manages both page cache and + RSS memory. + config PROC_PID_CPUSET bool "Include legacy /proc/<pid>/cpuset file" depends on CPUSETS diff -puN mm/Makefile~mem-control-setup mm/Makefile --- linux-2.6.22-rc6/mm/Makefile~mem-control-setup 2007-07-20 13:13:24.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/Makefile 2007-07-20 13:13:24.000000000 +0530 @@ -30,4 +30,5 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o obj-$(CONFIG_MIGRATION) += migrate.o obj-$(CONFIG_SMP) += allocpercpu.o obj-$(CONFIG_QUICKLIST) += quicklist.o +obj-$(CONFIG_CONTAINER_MEM_CONT) += memcontrol.o diff -puN /dev/null mm/memcontrol.c --- /dev/null 2007-06-01 20:42:04.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:24.000000000 +0530 @@ -0,0 +1,143 @@ +/* memcontrol.c - Memory Controller + * + * Copyright IBM Corporation, 2007 + * Author Balbir Singh <balbir@linux.vnet.ibm.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/res_counter.h> +#include <linux/memcontrol.h> +#include <linux/container.h> + +struct container_subsys mem_container_subsys; + +/* + * The memory controller data structure. The memory controller controls both + * page cache and RSS per container. We would eventually like to provide + * statistics based on the statistics developed by Rik Van Riel for clock-pro, + * to help the administrator determine what knobs to tune. + * + * TODO: Add a water mark for the memory controller. Reclaim will begin when + * we hit the water mark. + */ +struct mem_container { + struct container_subsys_state css; + /* + * the counter to account for memory usage + */ + struct res_counter res; +}; + +/* + * A meta page is associated with every page descriptor. The meta page + * helps us identify information about the container + */ +struct meta_page { + struct list_head lru; /* per container LRU list */ + struct page *page; + struct mem_container *mem_container; +}; + + +static inline +struct mem_container *mem_container_from_cont(struct container *cont) +{ + return container_of(container_subsys_state(cont, + mem_container_subsys_id), struct mem_container, + css); +} + +static ssize_t mem_container_read(struct container *cont, struct cftype *cft, + struct file *file, char __user *userbuf, size_t nbytes, + loff_t *ppos) +{ + return res_counter_read(&mem_container_from_cont(cont)->res, + cft->private, userbuf, nbytes, ppos); +} + +static ssize_t mem_container_write(struct container *cont, struct cftype *cft, + struct file *file, const char __user *userbuf, + size_t nbytes, loff_t *ppos) +{ + return res_counter_write(&mem_container_from_cont(cont)->res, + cft->private, userbuf, nbytes, ppos); +} + +static struct cftype mem_container_usage = { + .name = "mem_usage", + .private = RES_USAGE, + .read = mem_container_read, +}; + +static struct cftype mem_container_limit = { + .name = "mem_limit", + .private = RES_LIMIT, + .write = mem_container_write, + .read = mem_container_read, +}; + +static struct cftype mem_container_failcnt = { + .name = "mem_failcnt", + .private = RES_FAILCNT, + .read = mem_container_read, +}; + +static int mem_container_create(struct container_subsys *ss, + struct container *cont) +{ + struct mem_container *mem; + + mem = kzalloc(sizeof(struct mem_container), GFP_KERNEL); + if (!mem) + return -ENOMEM; + + res_counter_init(&mem->res); + cont->subsys[mem_container_subsys_id] = &mem->css; + mem->css.container = cont; + return 0; +} + +static void mem_container_destroy(struct container_subsys *ss, + struct container *cont) +{ + kfree(mem_container_from_cont(cont)); +} + +static int mem_container_populate(struct container_subsys *ss, + struct container *cont) +{ + int rc = 0; + + rc = container_add_file(cont, &mem_container_usage); + if (rc < 0) + goto err; + + rc = container_add_file(cont, &mem_container_limit); + if (rc < 0) + goto err; + + rc = container_add_file(cont, &mem_container_failcnt); + if (rc < 0) + goto err; + +err: + return rc; +} + +struct container_subsys mem_container_subsys = { + .name = "mem_container", + .subsys_id = mem_container_subsys_id, + .create = mem_container_create, + .destroy = mem_container_destroy, + .populate = mem_container_populate, + .early_init = 0, +}; diff -puN /dev/null include/linux/memcontrol.h --- /dev/null 2007-06-01 20:42:04.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:24.000000000 +0530 @@ -0,0 +1,21 @@ +/* memcontrol.h - Memory Controller + * + * Copyright IBM Corporation, 2007 + * Author Balbir Singh <balbir@linux.vnet.ibm.com> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef _LINUX_MEMCONTROL_H +#define _LINUX_MEMCONTROL_H + +#endif /* _LINUX_MEMCONTROL_H */ + _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 3/8] Memory controller accounting setup (v3)
From: Pavel Emelianov <xemul@openvz.org> Basic setup routines, the mm_struct has a pointer to the container that it belongs to and the the page has a meta_page associated with it. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/memcontrol.h | 35 +++++++++++++++++++++++++++++++ include/linux/mm_types.h | 4 +++ include/linux/sched.h | 4 +++ kernel/fork.c | 10 ++++++--- mm/memcontrol.c | 50 ++++++++++++++++++++++++++++++++++++++++++--- 5 files changed, 97 insertions(+), 6 deletions(-) diff -puN include/linux/memcontrol.h~mem-control-accounting-setup include/linux/memcontrol.h --- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-accounting-setup 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:25.000000000 +0530 @@ -3,6 +3,9 @@ * Copyright IBM Corporation, 2007 * Author Balbir Singh <balbir@linux.vnet.ibm.com> * + * Copyright 2007 OpenVZ SWsoft Inc + * Author: Pavel Emelianov <xemul@openvz.org> + * * 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 @@ -17,5 +20,37 @@ #ifndef _LINUX_MEMCONTROL_H #define _LINUX_MEMCONTROL_H +struct mem_container; +struct meta_page; + +#ifdef CONFIG_CONTAINER_MEM_CONT + +extern void mm_init_container(struct mm_struct *mm, struct task_struct *p); +extern void mm_free_container(struct mm_struct *mm); +extern void page_assign_meta_page(struct page *page, struct meta_page *mp); +extern struct meta_page *page_get_meta_page(struct page *page); + +#else /* CONFIG_CONTAINER_MEM_CONT */ +static inline void mm_init_container(struct mm_struct *mm, + struct task_struct *p) +{ +} + +static inline void mm_free_container(struct mm_struct *mm) +{ +} + +static inline void page_assign_meta_page(struct page *page, + struct meta_page *mp) +{ +} + +static inline struct meta_page *page_get_meta_page(struct page *page) +{ + return NULL; +} + +#endif /* CONFIG_CONTAINER_MEM_CONT */ + #endif /* _LINUX_MEMCONTROL_H */ diff -puN include/linux/mm_types.h~mem-control-accounting-setup include/linux/mm_types.h --- linux-2.6.22-rc6/include/linux/mm_types.h~mem-control-accounting-setup 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/mm_types.h 2007-07-20 13:13:25.000000000 +0530 @@ -5,6 +5,7 @@ #include <linux/threads.h> #include <linux/list.h> #include <linux/spinlock.h> +#include <linux/memcontrol.h> struct address_space; @@ -83,6 +84,9 @@ struct page { unsigned int gfp_mask; unsigned long trace[8]; #endif +#ifdef CONFIG_CONTAINER_MEM_CONT + struct meta_page *meta_page; +#endif }; #endif /* _LINUX_MM_TYPES_H */ diff -puN include/linux/sched.h~mem-control-accounting-setup include/linux/sched.h --- linux-2.6.22-rc6/include/linux/sched.h~mem-control-accounting-setup 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/sched.h 2007-07-20 13:13:25.000000000 +0530 @@ -90,6 +90,7 @@ struct sched_param { #include <asm/processor.h> +struct mem_container; struct exec_domain; struct futex_pi_state; struct bio; @@ -416,6 +417,9 @@ struct mm_struct { /* aio bits */ rwlock_t ioctx_list_lock; struct kioctx *ioctx_list; +#ifdef CONFIG_CONTAINER_MEM_CONT + struct mem_container *mem_container; +#endif }; struct sighand_struct { diff -puN kernel/fork.c~mem-control-accounting-setup kernel/fork.c --- linux-2.6.22-rc6/kernel/fork.c~mem-control-accounting-setup 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/kernel/fork.c 2007-07-20 13:13:25.000000000 +0530 @@ -330,7 +330,7 @@ static inline void mm_free_pgd(struct mm #include <linux/init_task.h> -static struct mm_struct * mm_init(struct mm_struct * mm) +static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p) { atomic_set(&mm->mm_users, 1); atomic_set(&mm->mm_count, 1); @@ -347,11 +347,14 @@ static struct mm_struct * mm_init(struct mm->ioctx_list = NULL; mm->free_area_cache = TASK_UNMAPPED_BASE; mm->cached_hole_size = ~0UL; + mm_init_container(mm, p); if (likely(!mm_alloc_pgd(mm))) { mm->def_flags = 0; return mm; } + + mm_free_container(mm); free_mm(mm); return NULL; } @@ -366,7 +369,7 @@ struct mm_struct * mm_alloc(void) mm = allocate_mm(); if (mm) { memset(mm, 0, sizeof(*mm)); - mm = mm_init(mm); + mm = mm_init(mm, current); } return mm; } @@ -380,6 +383,7 @@ void fastcall __mmdrop(struct mm_struct { BUG_ON(mm == &init_mm); mm_free_pgd(mm); + mm_free_container(mm); destroy_context(mm); free_mm(mm); } @@ -500,7 +504,7 @@ static struct mm_struct *dup_mm(struct t mm->token_priority = 0; mm->last_interval = 0; - if (!mm_init(mm)) + if (!mm_init(mm, tsk)) goto fail_nomem; if (init_new_context(tsk, mm)) diff -puN mm/memcontrol.c~mem-control-accounting-setup mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-accounting-setup 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:25.000000000 +0530 @@ -3,6 +3,9 @@ * Copyright IBM Corporation, 2007 * Author Balbir Singh <balbir@linux.vnet.ibm.com> * + * Copyright 2007 OpenVZ SWsoft Inc + * Author: Pavel Emelianov <xemul@openvz.org> + * * 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 @@ -17,6 +20,7 @@ #include <linux/res_counter.h> #include <linux/memcontrol.h> #include <linux/container.h> +#include <linux/mm.h> struct container_subsys mem_container_subsys; @@ -35,6 +39,13 @@ struct mem_container { * the counter to account for memory usage */ struct res_counter res; + /* + * Per container active and inactive list, similar to the + * per zone LRU lists. + * TODO: Consider making these lists per zone + */ + struct list_head active_list; + struct list_head inactive_list; }; /* @@ -56,6 +67,31 @@ struct mem_container *mem_container_from css); } +void mm_init_container(struct mm_struct *mm, struct task_struct *p) +{ + struct mem_container *mem; + + mem = mem_container_from_cont(task_container(p, + mem_container_subsys_id)); + css_get(&mem->css); + mm->mem_container = mem; +} + +void mm_free_container(struct mm_struct *mm) +{ + css_put(&mm->mem_container->css); +} + +void page_assign_meta_page(struct page *page, struct meta_page *mp) +{ + page->meta_page = mp; +} + +struct meta_page *page_get_meta_page(struct page *page) +{ + return page->meta_page; +} + static ssize_t mem_container_read(struct container *cont, struct cftype *cft, struct file *file, char __user *userbuf, size_t nbytes, loff_t *ppos) @@ -91,13 +127,21 @@ static struct cftype mem_container_failc .read = mem_container_read, }; +static struct mem_container init_mem_container; + static int mem_container_create(struct container_subsys *ss, struct container *cont) { struct mem_container *mem; - mem = kzalloc(sizeof(struct mem_container), GFP_KERNEL); - if (!mem) + if (unlikely((cont->parent) == NULL)) { + mem = &init_mem_container; + css_get(&mem->css); + init_mm.mem_container = mem; + } else + mem = kzalloc(sizeof(struct mem_container), GFP_KERNEL); + + if (mem == NULL) return -ENOMEM; res_counter_init(&mem->res); @@ -139,5 +183,5 @@ struct container_subsys mem_container_su .create = mem_container_create, .destroy = mem_container_destroy, .populate = mem_container_populate, - .early_init = 0, + .early_init = 1, }; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 4/8] Memory controller memory accounting (v3)
Changelog 1. Improved error handling, uncharge on errors and check to see if we are leaking pages (review by YAMAMOTO Takashi) Add the accounting hooks. The accounting is carried out for RSS and Page Cache (unmapped) pages. There is now a common limit and accounting for both. The RSS accounting is accounted at page_add_*_rmap() and page_remove_rmap() time. Page cache is accounted at add_to_page_cache(), __delete_from_page_cache(). Swap cache is also accounted for. Each page's meta_page is protected with a bit in page flags, this makes handling of race conditions involving simultaneous mappings of a page easier. A reference count is kept in the meta_page to deal with cases where a page might be unmapped from the RSS of all tasks, but still lives in the page cache. Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/memcontrol.h | 11 +++ include/linux/page-flags.h | 3 + mm/filemap.c | 12 +++- mm/memcontrol.c | 134 ++++++++++++++++++++++++++++++++++++++++++++- mm/memory.c | 44 +++++++++++++- mm/migrate.c | 6 ++ mm/page_alloc.c | 3 + mm/rmap.c | 2 mm/swap_state.c | 12 +++- mm/swapfile.c | 40 +++++++------ 10 files changed, 243 insertions(+), 24 deletions(-) diff -puN fs/exec.c~mem-control-accounting fs/exec.c diff -puN include/linux/memcontrol.h~mem-control-accounting include/linux/memcontrol.h --- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:25.000000000 +0530 @@ -29,6 +29,8 @@ extern void mm_init_container(struct mm_ extern void mm_free_container(struct mm_struct *mm); extern void page_assign_meta_page(struct page *page, struct meta_page *mp); extern struct meta_page *page_get_meta_page(struct page *page); +extern int mem_container_charge(struct page *page, struct mm_struct *mm); +extern void mem_container_uncharge(struct meta_page *mp); #else /* CONFIG_CONTAINER_MEM_CONT */ static inline void mm_init_container(struct mm_struct *mm, @@ -50,6 +52,15 @@ static inline struct meta_page *page_get return NULL; } +static inline int mem_container_charge(struct page *page, struct mm_struct *mm) +{ + return 0; +} + +static inline void mem_container_uncharge(struct meta_page *mp) +{ +} + #endif /* CONFIG_CONTAINER_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */ diff -puN include/linux/page-flags.h~mem-control-accounting include/linux/page-flags.h --- linux-2.6.22-rc6/include/linux/page-flags.h~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/page-flags.h 2007-07-20 13:13:25.000000000 +0530 @@ -98,6 +98,9 @@ #define PG_checked PG_owner_priv_1 /* Used by some filesystems */ #define PG_pinned PG_owner_priv_1 /* Xen pinned pagetable */ +#define PG_metapage 21 /* Used for checking if a meta_page */ + /* is associated with a page */ + #if (BITS_PER_LONG > 32) /* * 64-bit-only flags build down from bit 31 diff -puN mm/filemap.c~mem-control-accounting mm/filemap.c --- linux-2.6.22-rc6/mm/filemap.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/filemap.c 2007-07-20 13:13:25.000000000 +0530 @@ -31,6 +31,7 @@ #include <linux/syscalls.h> #include <linux/cpuset.h> #include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */ +#include <linux/memcontrol.h> #include "internal.h" /* @@ -116,6 +117,7 @@ void __remove_from_page_cache(struct pag { struct address_space *mapping = page->mapping; + mem_container_uncharge(page_get_meta_page(page)); radix_tree_delete(&mapping->page_tree, page->index); page->mapping = NULL; mapping->nrpages--; @@ -442,6 +444,11 @@ int add_to_page_cache(struct page *page, int error = radix_tree_preload(gfp_mask & ~__GFP_HIGHMEM); if (error == 0) { + + error = mem_container_charge(page, current->mm); + if (error) + goto out; + write_lock_irq(&mapping->tree_lock); error = radix_tree_insert(&mapping->page_tree, offset, page); if (!error) { @@ -451,10 +458,13 @@ int add_to_page_cache(struct page *page, page->index = offset; mapping->nrpages++; __inc_zone_page_state(page, NR_FILE_PAGES); - } + } else + mem_container_uncharge(page_get_meta_page(page)); + write_unlock_irq(&mapping->tree_lock); radix_tree_preload_end(); } +out: return error; } EXPORT_SYMBOL(add_to_page_cache); diff -puN mm/memcontrol.c~mem-control-accounting mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:25.000000000 +0530 @@ -21,6 +21,9 @@ #include <linux/memcontrol.h> #include <linux/container.h> #include <linux/mm.h> +#include <linux/page-flags.h> +#include <linux/bit_spinlock.h> +#include <linux/rcupdate.h> struct container_subsys mem_container_subsys; @@ -31,7 +34,9 @@ struct container_subsys mem_container_su * to help the administrator determine what knobs to tune. * * TODO: Add a water mark for the memory controller. Reclaim will begin when - * we hit the water mark. + * we hit the water mark. May be even add a low water mark, such that + * no reclaim occurs from a container at it's low water mark, this is + * a feature that will be implemented much later in the future. */ struct mem_container { struct container_subsys_state css; @@ -56,6 +61,7 @@ struct meta_page { struct list_head lru; /* per container LRU list */ struct page *page; struct mem_container *mem_container; + atomic_t ref_cnt; }; @@ -92,6 +98,130 @@ struct meta_page *page_get_meta_page(str return page->meta_page; } +void __always_inline lock_meta_page(struct page *page) +{ + bit_spin_lock(PG_metapage, &page->flags); +} + +void __always_inline unlock_meta_page(struct page *page) +{ + bit_spin_unlock(PG_metapage, &page->flags); +} + +/* + * Charge the memory controller for page usage. + * Return + * 0 if the charge was successful + * < 0 if the container is over its limit + */ +int mem_container_charge(struct page *page, struct mm_struct *mm) +{ + struct mem_container *mem; + struct meta_page *mp; + + /* + * Should meta_page's go to their own slab? + * One could optimize the performance of the charging routine + * by saving a bit in the page_flags and using it as a lock + * to see if the container page already has a meta_page associated + * with it + */ + lock_meta_page(page); + mp = page_get_meta_page(page); + /* + * The meta_page exists and the page has already been accounted + */ + if (mp) { + atomic_inc(&mp->ref_cnt); + goto done; + } + + unlock_meta_page(page); + + mp = kzalloc(sizeof(struct meta_page), GFP_KERNEL); + if (mp == NULL) + goto err; + + rcu_read_lock(); + /* + * We always charge the container the mm_struct belongs to + * the mm_struct's mem_container changes on task migration if the + * thread group leader migrates. It's possible that mm is not + * set, if so charge the init_mm (happens for pagecache usage). + */ + if (!mm) + mm = &init_mm; + + mem = rcu_dereference(mm->mem_container); + /* + * For every charge from the container, increment reference + * count + */ + css_get(&mem->css); + rcu_read_unlock(); + + /* + * If we created the meta_page, we should free it on exceeding + * the container limit. + */ + if (res_counter_charge(&mem->res, 1)) { + css_put(&mem->css); + goto free_mp; + } + + lock_meta_page(page); + /* + * Check if somebody else beat us to allocating the meta_page + */ + if (page_get_meta_page(page)) { + atomic_inc(&mp->ref_cnt); + res_counter_uncharge(&mem->res, 1); + goto done; + } + + atomic_set(&mp->ref_cnt, 1); + mp->mem_container = mem; + mp->page = page; + page_assign_meta_page(page, mp); + +done: + unlock_meta_page(page); + return 0; +free_mp: + kfree(mp); + return -ENOMEM; +err: + unlock_meta_page(page); + return -ENOMEM; +} + +/* + * Uncharging is always a welcome operation, we never complain, simply + * uncharge. + */ +void mem_container_uncharge(struct meta_page *mp) +{ + struct mem_container *mem; + struct page *page; + + /* + * This can happen for PAGE_ZERO + */ + if (!mp) + return; + + if (atomic_dec_and_test(&mp->ref_cnt)) { + page = mp->page; + lock_meta_page(page); + mem = mp->mem_container; + css_put(&mem->css); + page_assign_meta_page(page, NULL); + unlock_meta_page(page); + res_counter_uncharge(&mem->res, 1); + kfree(mp); + } +} + static ssize_t mem_container_read(struct container *cont, struct cftype *cft, struct file *file, char __user *userbuf, size_t nbytes, loff_t *ppos) @@ -147,6 +277,8 @@ static int mem_container_create(struct c res_counter_init(&mem->res); cont->subsys[mem_container_subsys_id] = &mem->css; mem->css.container = cont; + INIT_LIST_HEAD(&mem->active_list); + INIT_LIST_HEAD(&mem->inactive_list); return 0; } diff -puN mm/memory.c~mem-control-accounting mm/memory.c --- linux-2.6.22-rc6/mm/memory.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memory.c 2007-07-20 13:13:25.000000000 +0530 @@ -50,6 +50,7 @@ #include <linux/delayacct.h> #include <linux/init.h> #include <linux/writeback.h> +#include <linux/memcontrol.h> #include <asm/pgalloc.h> #include <asm/uaccess.h> @@ -1226,14 +1227,18 @@ static int insert_page(struct mm_struct pte_t *pte; spinlock_t *ptl; + retval = mem_container_charge(page, mm); + if (retval) + goto out; + retval = -EINVAL; if (PageAnon(page)) - goto out; + goto out_uncharge; retval = -ENOMEM; flush_dcache_page(page); pte = get_locked_pte(mm, addr, &ptl); if (!pte) - goto out; + goto out_uncharge; retval = -EBUSY; if (!pte_none(*pte)) goto out_unlock; @@ -1245,8 +1250,11 @@ static int insert_page(struct mm_struct set_pte_at(mm, addr, pte, mk_pte(page, prot)); retval = 0; + return retval; out_unlock: pte_unmap_unlock(pte, ptl); +out_uncharge: + mem_container_uncharge(page_get_meta_page(page)); out: return retval; } @@ -1731,6 +1739,9 @@ gotten: cow_user_page(new_page, old_page, address, vma); } + if (mem_container_charge(new_page, mm)) + goto oom_free_new; + /* * Re-check the pte - we dropped the lock */ @@ -1763,7 +1774,9 @@ gotten: /* Free the old page.. */ new_page = old_page; ret |= VM_FAULT_WRITE; - } + } else + mem_container_uncharge(page_get_meta_page(new_page)); + if (new_page) page_cache_release(new_page); if (old_page) @@ -1784,6 +1797,8 @@ unlock: put_page(dirty_page); } return ret; +oom_free_new: + __free_page(new_page); oom: if (old_page) page_cache_release(old_page); @@ -2188,6 +2203,11 @@ static int do_swap_page(struct mm_struct } delayacct_clear_flag(DELAYACCT_PF_SWAPIN); + if (mem_container_charge(page, mm)) { + ret = VM_FAULT_OOM; + goto out; + } + mark_page_accessed(page); lock_page(page); @@ -2223,8 +2243,10 @@ static int do_swap_page(struct mm_struct if (write_access) { if (do_wp_page(mm, vma, address, - page_table, pmd, ptl, pte) == VM_FAULT_OOM) + page_table, pmd, ptl, pte) == VM_FAULT_OOM) { + mem_container_uncharge(page_get_meta_page(page)); ret = VM_FAULT_OOM; + } goto out; } @@ -2235,6 +2257,7 @@ unlock: out: return ret; out_nomap: + mem_container_uncharge(page_get_meta_page(page)); pte_unmap_unlock(page_table, ptl); unlock_page(page); page_cache_release(page); @@ -2255,6 +2278,7 @@ static int do_anonymous_page(struct mm_s pte_t entry; if (write_access) { + /* Allocate our own private page. */ pte_unmap(page_table); @@ -2264,6 +2288,9 @@ static int do_anonymous_page(struct mm_s if (!page) goto oom; + if (mem_container_charge(page, mm)) + goto oom_free_page; + entry = mk_pte(page, vma->vm_page_prot); entry = maybe_mkwrite(pte_mkdirty(entry), vma); @@ -2296,8 +2323,11 @@ unlock: pte_unmap_unlock(page_table, ptl); return VM_FAULT_MINOR; release: + mem_container_uncharge(page_get_meta_page(page)); page_cache_release(page); goto unlock; +oom_free_page: + __free_page(page); oom: return VM_FAULT_OOM; } @@ -2397,6 +2427,11 @@ static int __do_fault(struct mm_struct * } + if (mem_container_charge(page, mm)) { + fdata.type = VM_FAULT_OOM; + goto out; + } + page_table = pte_offset_map_lock(mm, pmd, address, &ptl); /* @@ -2433,6 +2468,7 @@ static int __do_fault(struct mm_struct * update_mmu_cache(vma, address, entry); lazy_mmu_prot_update(entry); } else { + mem_container_uncharge(page_get_meta_page(page)); if (anon) page_cache_release(page); else diff -puN mm/migrate.c~mem-control-accounting mm/migrate.c --- linux-2.6.22-rc6/mm/migrate.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/migrate.c 2007-07-20 13:13:25.000000000 +0530 @@ -28,6 +28,7 @@ #include <linux/mempolicy.h> #include <linux/vmalloc.h> #include <linux/security.h> +#include <linux/memcontrol.h> #include "internal.h" @@ -157,6 +158,11 @@ static void remove_migration_pte(struct return; } + if (mem_container_charge(new, mm)) { + pte_unmap(ptep); + return; + } + ptl = pte_lockptr(mm, pmd); spin_lock(ptl); pte = *ptep; diff -puN mm/page_alloc.c~mem-control-accounting mm/page_alloc.c --- linux-2.6.22-rc6/mm/page_alloc.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/page_alloc.c 2007-07-20 13:13:25.000000000 +0530 @@ -41,6 +41,7 @@ #include <linux/pfn.h> #include <linux/backing-dev.h> #include <linux/fault-inject.h> +#include <linux/memcontrol.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -1015,6 +1016,7 @@ static void fastcall free_hot_cold_page( if (!PageHighMem(page)) debug_check_no_locks_freed(page_address(page), PAGE_SIZE); + page_assign_meta_page(page, NULL); arch_free_page(page, 0); kernel_map_pages(page, 1, 0); @@ -2576,6 +2578,7 @@ void __meminit memmap_init_zone(unsigned set_page_links(page, zone, nid, pfn); init_page_count(page); reset_page_mapcount(page); + page_assign_meta_page(page, NULL); SetPageReserved(page); /* diff -puN mm/rmap.c~mem-control-accounting mm/rmap.c --- linux-2.6.22-rc6/mm/rmap.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/rmap.c 2007-07-20 13:13:25.000000000 +0530 @@ -643,6 +643,8 @@ void page_remove_rmap(struct page *page, page_clear_dirty(page); set_page_dirty(page); } + + mem_container_uncharge(page_get_meta_page(page)); __dec_zone_page_state(page, PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED); } diff -puN mm/swapfile.c~mem-control-accounting mm/swapfile.c --- linux-2.6.22-rc6/mm/swapfile.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/swapfile.c 2007-07-20 13:13:25.000000000 +0530 @@ -506,9 +506,12 @@ unsigned int count_swap_pages(int type, * just let do_wp_page work it out if a write is requested later - to * force COW, vm_page_prot omits write permission from any private vma. */ -static void unuse_pte(struct vm_area_struct *vma, pte_t *pte, +static int unuse_pte(struct vm_area_struct *vma, pte_t *pte, unsigned long addr, swp_entry_t entry, struct page *page) { + if (mem_container_charge(page, vma->vm_mm)) + return -ENOMEM; + inc_mm_counter(vma->vm_mm, anon_rss); get_page(page); set_pte_at(vma->vm_mm, addr, pte, @@ -520,6 +523,7 @@ static void unuse_pte(struct vm_area_str * immediately swapped out again after swapon. */ activate_page(page); + return 1; } static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd, @@ -529,7 +533,7 @@ static int unuse_pte_range(struct vm_are pte_t swp_pte = swp_entry_to_pte(entry); pte_t *pte; spinlock_t *ptl; - int found = 0; + int ret = 0; pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); do { @@ -538,13 +542,12 @@ static int unuse_pte_range(struct vm_are * Test inline before going to call unuse_pte. */ if (unlikely(pte_same(*pte, swp_pte))) { - unuse_pte(vma, pte++, addr, entry, page); - found = 1; + ret = unuse_pte(vma, pte++, addr, entry, page); break; } } while (pte++, addr += PAGE_SIZE, addr != end); pte_unmap_unlock(pte - 1, ptl); - return found; + return ret; } static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud, @@ -553,14 +556,16 @@ static inline int unuse_pmd_range(struct { pmd_t *pmd; unsigned long next; + int ret; pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); if (pmd_none_or_clear_bad(pmd)) continue; - if (unuse_pte_range(vma, pmd, addr, next, entry, page)) - return 1; + ret = unuse_pte_range(vma, pmd, addr, next, entry, page); + if (ret) + return ret; } while (pmd++, addr = next, addr != end); return 0; } @@ -571,14 +576,16 @@ static inline int unuse_pud_range(struct { pud_t *pud; unsigned long next; + int ret; pud = pud_offset(pgd, addr); do { next = pud_addr_end(addr, end); if (pud_none_or_clear_bad(pud)) continue; - if (unuse_pmd_range(vma, pud, addr, next, entry, page)) - return 1; + ret = unuse_pmd_range(vma, pud, addr, next, entry, page); + if (ret) + return ret; } while (pud++, addr = next, addr != end); return 0; } @@ -588,6 +595,7 @@ static int unuse_vma(struct vm_area_stru { pgd_t *pgd; unsigned long addr, end, next; + int ret; if (page->mapping) { addr = page_address_in_vma(page, vma); @@ -605,8 +613,9 @@ static int unuse_vma(struct vm_area_stru next = pgd_addr_end(addr, end); if (pgd_none_or_clear_bad(pgd)) continue; - if (unuse_pud_range(vma, pgd, addr, next, entry, page)) - return 1; + ret = unuse_pud_range(vma, pgd, addr, next, entry, page); + if (ret) + return ret; } while (pgd++, addr = next, addr != end); return 0; } @@ -615,6 +624,7 @@ static int unuse_mm(struct mm_struct *mm swp_entry_t entry, struct page *page) { struct vm_area_struct *vma; + int ret = 0; if (!down_read_trylock(&mm->mmap_sem)) { /* @@ -627,15 +637,11 @@ static int unuse_mm(struct mm_struct *mm lock_page(page); } for (vma = mm->mmap; vma; vma = vma->vm_next) { - if (vma->anon_vma && unuse_vma(vma, entry, page)) + if (vma->anon_vma && (ret = unuse_vma(vma, entry, page))) break; } up_read(&mm->mmap_sem); - /* - * Currently unuse_mm cannot fail, but leave error handling - * at call sites for now, since we change it from time to time. - */ - return 0; + return ret; } /* diff -puN mm/swap_state.c~mem-control-accounting mm/swap_state.c --- linux-2.6.22-rc6/mm/swap_state.c~mem-control-accounting 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/swap_state.c 2007-07-20 13:13:25.000000000 +0530 @@ -17,6 +17,7 @@ #include <linux/backing-dev.h> #include <linux/pagevec.h> #include <linux/migrate.h> +#include <linux/memcontrol.h> #include <asm/pgtable.h> @@ -79,6 +80,11 @@ static int __add_to_swap_cache(struct pa BUG_ON(PagePrivate(page)); error = radix_tree_preload(gfp_mask); if (!error) { + + error = mem_container_charge(page, current->mm); + if (error) + goto out; + write_lock_irq(&swapper_space.tree_lock); error = radix_tree_insert(&swapper_space.page_tree, entry.val, page); @@ -89,10 +95,13 @@ static int __add_to_swap_cache(struct pa set_page_private(page, entry.val); total_swapcache_pages++; __inc_zone_page_state(page, NR_FILE_PAGES); - } + } else + mem_container_uncharge(page_get_meta_page(page)); + write_unlock_irq(&swapper_space.tree_lock); radix_tree_preload_end(); } +out: return error; } @@ -129,6 +138,7 @@ void __delete_from_swap_cache(struct pag BUG_ON(PageWriteback(page)); BUG_ON(PagePrivate(page)); + mem_container_uncharge(page_get_meta_page(page)); radix_tree_delete(&swapper_space.page_tree, page_private(page)); set_page_private(page, 0); ClearPageSwapCache(page); _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 5/8] Memory controller task migration (v3)
Allow tasks to migrate from one container to the other. We migrate mm_struct's mem_container only when the thread group id migrates. Signed-off-by: <balbir@linux.vnet.ibm.com> --- mm/memcontrol.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff -puN mm/memcontrol.c~mem-control-task-migration mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-task-migration 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:25.000000000 +0530 @@ -309,11 +309,46 @@ err: return rc; } +static void mem_container_move_task(struct container_subsys *ss, + struct container *cont, + struct container *old_cont, + struct task_struct *p) +{ + struct mm_struct *mm; + struct mem_container *mem, *old_mem; + + mm = get_task_mm(p); + if (mm == NULL) + return; + + mem = mem_container_from_cont(cont); + old_mem = mem_container_from_cont(old_cont); + + if (mem == old_mem) + goto out; + + /* + * Only thread group leaders are allowed to migrate, the mm_struct is + * in effect owned by the leader + */ + if (p->tgid != p->pid) + goto out; + + css_get(&mem->css); + rcu_assign_pointer(mm->mem_container, mem); + css_put(&old_mem->css); + +out: + mmput(mm); + return; +} + struct container_subsys mem_container_subsys = { .name = "mem_container", .subsys_id = mem_container_subsys_id, .create = mem_container_create, .destroy = mem_container_destroy, .populate = mem_container_populate, + .attach = mem_container_move_task, .early_init = 1, }; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 6/8] Memory controller add per container LRU and reclaim (v3)
Add the meta_page to the per container LRU. The reclaim algorithm has been modified to make the isolate_lru_pages() as a pluggable component. The scan_control data structure now accepts the container on behalf of which reclaims are carried out. try_to_free_pages() has been extended to become container aware. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/memcontrol.h | 11 +++ include/linux/res_counter.h | 23 ++++++++ include/linux/swap.h | 3 + mm/memcontrol.c | 120 +++++++++++++++++++++++++++++++++++++++++ mm/swap.c | 2 mm/vmscan.c | 126 +++++++++++++++++++++++++++++++++++--------- 6 files changed, 259 insertions(+), 26 deletions(-) diff -puN include/linux/memcontrol.h~mem-control-lru-and-reclaim include/linux/memcontrol.h --- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:25.000000000 +0530 @@ -31,6 +31,13 @@ extern void page_assign_meta_page(struct extern struct meta_page *page_get_meta_page(struct page *page); extern int mem_container_charge(struct page *page, struct mm_struct *mm); extern void mem_container_uncharge(struct meta_page *mp); +extern void mem_container_move_lists(struct meta_page *mp, bool active); +extern unsigned long mem_container_isolate_pages(unsigned long nr_to_scan, + struct list_head *dst, + unsigned long *scanned, int order, + int mode, struct zone *z, + struct mem_container *mem_cont, + int active); #else /* CONFIG_CONTAINER_MEM_CONT */ static inline void mm_init_container(struct mm_struct *mm, @@ -61,6 +68,10 @@ static inline void mem_container_uncharg { } +static inline void mem_container_move_lists(struct meta_page *mp, bool active) +{ +} + #endif /* CONFIG_CONTAINER_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */ diff -puN include/linux/swap.h~mem-control-lru-and-reclaim include/linux/swap.h --- linux-2.6.22-rc6/include/linux/swap.h~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/swap.h 2007-07-20 13:13:25.000000000 +0530 @@ -6,6 +6,7 @@ #include <linux/mmzone.h> #include <linux/list.h> #include <linux/sched.h> +#include <linux/memcontrol.h> #include <asm/atomic.h> #include <asm/page.h> @@ -191,6 +192,8 @@ extern void swap_setup(void); /* linux/mm/vmscan.c */ extern unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask); +extern unsigned long try_to_free_mem_container_pages(struct mem_container *mem); +extern int __isolate_lru_page(struct page *page, int mode); extern unsigned long shrink_all_memory(unsigned long nr_pages); extern int vm_swappiness; extern int remove_mapping(struct address_space *mapping, struct page *page); diff -puN mm/memcontrol.c~mem-control-lru-and-reclaim mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:25.000000000 +0530 @@ -24,6 +24,8 @@ #include <linux/page-flags.h> #include <linux/bit_spinlock.h> #include <linux/rcupdate.h> +#include <linux/swap.h> +#include <linux/spinlock.h> struct container_subsys mem_container_subsys; @@ -51,6 +53,10 @@ struct mem_container { */ struct list_head active_list; struct list_head inactive_list; + /* + * spin_lock to protect the per container LRU + */ + spinlock_t lru_lock; }; /* @@ -108,6 +114,92 @@ void __always_inline unlock_meta_page(st bit_spin_unlock(PG_metapage, &page->flags); } +unsigned long mem_container_isolate_pages(unsigned long nr_to_scan, + struct list_head *dst, + unsigned long *scanned, int order, + int mode, struct zone *z, + struct mem_container *mem_cont, + int active) +{ + unsigned long nr_taken = 0; + struct page *page; + unsigned long scan; + LIST_HEAD(mp_list); + struct list_head *src; + struct meta_page *mp; + + if (active) + src = &mem_cont->active_list; + else + src = &mem_cont->inactive_list; + + for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) { + mp = list_entry(src->prev, struct meta_page, lru); + page = mp->page; + + if (PageActive(page) && !active) { + mem_container_move_lists(mp, true); + scan--; + continue; + } + if (!PageActive(page) && active) { + mem_container_move_lists(mp, false); + scan--; + continue; + } + + /* + * Reclaim, per zone + * TODO: make the active/inactive lists per zone + */ + if (page_zone(page) != z) + continue; + + spin_lock(&mem_cont->lru_lock); + /* + * Check if the meta page went away from under us + */ + if (!list_empty(&mp->lru)) + list_move(&mp->lru, &mp_list); + else { + spin_unlock(&mem_cont->lru_lock); + continue; + } + spin_unlock(&mem_cont->lru_lock); + + if (__isolate_lru_page(page, mode) == 0) { + list_move(&page->lru, dst); + nr_taken++; + } + } + + spin_lock(&mem_cont->lru_lock); + list_splice(&mp_list, src); + spin_unlock(&mem_cont->lru_lock); + + *scanned = scan; + return nr_taken; +} + +/* + * This routine assumes that the appropriate zone's lru lock is already held + */ +void mem_container_move_lists(struct meta_page *mp, bool active) +{ + struct mem_container *mem; + if (!mp) + return; + + mem = mp->mem_container; + + spin_lock(&mem->lru_lock); + if (active) + list_move(&mp->lru, &mp->mem_container->active_list); + else + list_move(&mp->lru, &mp->mem_container->inactive_list); + spin_unlock(&mem->lru_lock); +} + /* * Charge the memory controller for page usage. * Return @@ -118,6 +210,7 @@ int mem_container_charge(struct page *pa { struct mem_container *mem; struct meta_page *mp; + unsigned long flags; /* * Should meta_page's go to their own slab? @@ -164,7 +257,20 @@ int mem_container_charge(struct page *pa * If we created the meta_page, we should free it on exceeding * the container limit. */ - if (res_counter_charge(&mem->res, 1)) { + while (res_counter_charge(&mem->res, 1)) { + if (try_to_free_mem_container_pages(mem)) + continue; + + /* + * try_to_free_mem_container_pages() might not give us a full + * picture of reclaim. Some pages are reclaimed and might be + * moved to swap cache or just unmapped from the container. + * Check the limit again to see if the reclaim reduced the + * current usage of the container before giving up + */ + if (res_counter_check_under_limit(&mem->res)) + continue; + css_put(&mem->css); goto free_mp; } @@ -184,6 +290,10 @@ int mem_container_charge(struct page *pa mp->page = page; page_assign_meta_page(page, mp); + spin_lock_irqsave(&mem->lru_lock, flags); + list_add(&mp->lru, &mem->active_list); + spin_unlock_irqrestore(&mem->lru_lock, flags); + done: unlock_meta_page(page); return 0; @@ -203,6 +313,7 @@ void mem_container_uncharge(struct meta_ { struct mem_container *mem; struct page *page; + unsigned long flags; /* * This can happen for PAGE_ZERO @@ -212,12 +323,18 @@ void mem_container_uncharge(struct meta_ if (atomic_dec_and_test(&mp->ref_cnt)) { page = mp->page; + lock_meta_page(page); mem = mp->mem_container; css_put(&mem->css); page_assign_meta_page(page, NULL); unlock_meta_page(page); + res_counter_uncharge(&mem->res, 1); + + spin_lock_irqsave(&mem->lru_lock, flags); + list_del_init(&mp->lru); + spin_unlock_irqrestore(&mem->lru_lock, flags); kfree(mp); } } @@ -279,6 +396,7 @@ static int mem_container_create(struct c mem->css.container = cont; INIT_LIST_HEAD(&mem->active_list); INIT_LIST_HEAD(&mem->inactive_list); + spin_lock_init(&mem->lru_lock); return 0; } diff -puN mm/swap.c~mem-control-lru-and-reclaim mm/swap.c --- linux-2.6.22-rc6/mm/swap.c~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/swap.c 2007-07-20 13:13:25.000000000 +0530 @@ -31,6 +31,7 @@ #include <linux/cpu.h> #include <linux/notifier.h> #include <linux/init.h> +#include <linux/memcontrol.h> /* How many pages do we try to swap or page in/out together? */ int page_cluster; @@ -148,6 +149,7 @@ void fastcall activate_page(struct page SetPageActive(page); add_page_to_active_list(zone, page); __count_vm_event(PGACTIVATE); + mem_container_move_lists(page_get_meta_page(page), true); } spin_unlock_irq(&zone->lru_lock); } diff -puN mm/vmscan.c~mem-control-lru-and-reclaim mm/vmscan.c --- linux-2.6.22-rc6/mm/vmscan.c~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/vmscan.c 2007-07-20 13:13:25.000000000 +0530 @@ -39,6 +39,7 @@ #include <linux/delay.h> #include <linux/kthread.h> #include <linux/freezer.h> +#include <linux/memcontrol.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -70,6 +71,15 @@ struct scan_control { int all_unreclaimable; int order; + + /* Which container do we reclaim from */ + struct mem_container *mem_container; + + /* Pluggable isolate pages callback */ + unsigned long (*isolate_pages)(unsigned long nr, struct list_head *dst, + unsigned long *scanned, int order, int mode, + struct zone *z, struct mem_container *mem_cont, + int active); }; #define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru)) @@ -604,7 +614,7 @@ keep: * * returns 0 on success, -ve errno on failure. */ -static int __isolate_lru_page(struct page *page, int mode) +int __isolate_lru_page(struct page *page, int mode) { int ret = -EINVAL; @@ -738,6 +748,21 @@ static unsigned long isolate_lru_pages(u return nr_taken; } +static unsigned long isolate_pages_global(unsigned long nr, + struct list_head *dst, + unsigned long *scanned, int order, + int mode, struct zone *z, + struct mem_container *mem_cont, + int active) +{ + if (active) + return isolate_lru_pages(nr, &z->active_list, dst, + scanned, order, mode); + else + return isolate_lru_pages(nr, &z->inactive_list, dst, + scanned, order, mode); +} + /* * clear_active_flags() is a helper for shrink_active_list(), clearing * any active bits from the pages in the list. @@ -779,11 +804,11 @@ static unsigned long shrink_inactive_lis unsigned long nr_freed; unsigned long nr_active; - nr_taken = isolate_lru_pages(sc->swap_cluster_max, - &zone->inactive_list, + nr_taken = sc->isolate_pages(sc->swap_cluster_max, &page_list, &nr_scan, sc->order, (sc->order > PAGE_ALLOC_COSTLY_ORDER)? - ISOLATE_BOTH : ISOLATE_INACTIVE); + ISOLATE_BOTH : ISOLATE_INACTIVE, + zone, sc->mem_container, 0); nr_active = clear_active_flags(&page_list); __mod_zone_page_state(zone, NR_ACTIVE, -nr_active); @@ -932,8 +957,9 @@ force_reclaim_mapped: lru_add_drain(); spin_lock_irq(&zone->lru_lock); - pgmoved = isolate_lru_pages(nr_pages, &zone->active_list, - &l_hold, &pgscanned, sc->order, ISOLATE_ACTIVE); + pgmoved = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order, + ISOLATE_ACTIVE, zone, + sc->mem_container, 1); zone->pages_scanned += pgscanned; __mod_zone_page_state(zone, NR_ACTIVE, -pgmoved); spin_unlock_irq(&zone->lru_lock); @@ -968,6 +994,7 @@ force_reclaim_mapped: ClearPageActive(page); list_move(&page->lru, &zone->inactive_list); + mem_container_move_lists(page_get_meta_page(page), false); pgmoved++; if (!pagevec_add(&pvec, page)) { __mod_zone_page_state(zone, NR_INACTIVE, pgmoved); @@ -996,6 +1023,7 @@ force_reclaim_mapped: SetPageLRU(page); VM_BUG_ON(!PageActive(page)); list_move(&page->lru, &zone->active_list); + mem_container_move_lists(page_get_meta_page(page), true); pgmoved++; if (!pagevec_add(&pvec, page)) { __mod_zone_page_state(zone, NR_ACTIVE, pgmoved); @@ -1127,7 +1155,8 @@ static unsigned long shrink_zones(int pr * holds filesystem locks which prevent writeout this might not work, and the * allocation attempt will fail. */ -unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask) +unsigned long do_try_to_free_pages(struct zone **zones, gfp_t gfp_mask, + struct scan_control *sc) { int priority; int ret = 0; @@ -1136,14 +1165,6 @@ unsigned long try_to_free_pages(struct z struct reclaim_state *reclaim_state = current->reclaim_state; unsigned long lru_pages = 0; int i; - struct scan_control sc = { - .gfp_mask = gfp_mask, - .may_writepage = !laptop_mode, - .swap_cluster_max = SWAP_CLUSTER_MAX, - .may_swap = 1, - .swappiness = vm_swappiness, - .order = order, - }; delay_swap_prefetch(); count_vm_event(ALLOCSTALL); @@ -1159,17 +1180,22 @@ unsigned long try_to_free_pages(struct z } for (priority = DEF_PRIORITY; priority >= 0; priority--) { - sc.nr_scanned = 0; + sc->nr_scanned = 0; if (!priority) disable_swap_token(); - nr_reclaimed += shrink_zones(priority, zones, &sc); - shrink_slab(sc.nr_scanned, gfp_mask, lru_pages); + nr_reclaimed += shrink_zones(priority, zones, sc); + /* + * Don't shrink slabs when reclaiming memory from + * over limit containers + */ + if (sc->mem_container == NULL) + shrink_slab(sc->nr_scanned, gfp_mask, lru_pages); if (reclaim_state) { nr_reclaimed += reclaim_state->reclaimed_slab; reclaim_state->reclaimed_slab = 0; } - total_scanned += sc.nr_scanned; - if (nr_reclaimed >= sc.swap_cluster_max) { + total_scanned += sc->nr_scanned; + if (nr_reclaimed >= sc->swap_cluster_max) { ret = 1; goto out; } @@ -1181,18 +1207,18 @@ unsigned long try_to_free_pages(struct z * that's undesirable in laptop mode, where we *want* lumpy * writeout. So in laptop mode, write out the whole world. */ - if (total_scanned > sc.swap_cluster_max + - sc.swap_cluster_max / 2) { + if (total_scanned > sc->swap_cluster_max + + sc->swap_cluster_max / 2) { wakeup_pdflush(laptop_mode ? 0 : total_scanned); - sc.may_writepage = 1; + sc->may_writepage = 1; } /* Take a nap, wait for some writeback to complete */ - if (sc.nr_scanned && priority < DEF_PRIORITY - 2) + if (sc->nr_scanned && priority < DEF_PRIORITY - 2) congestion_wait(WRITE, HZ/10); } /* top priority shrink_caches still had more to do? don't OOM, then */ - if (!sc.all_unreclaimable) + if (!sc->all_unreclaimable && sc->mem_container == NULL) ret = 1; out: /* @@ -1215,6 +1241,54 @@ out: return ret; } +unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask) +{ + struct scan_control sc = { + .gfp_mask = gfp_mask, + .may_writepage = !laptop_mode, + .swap_cluster_max = SWAP_CLUSTER_MAX, + .may_swap = 1, + .swappiness = vm_swappiness, + .order = order, + .mem_container = NULL, + .isolate_pages = isolate_pages_global, + }; + + return do_try_to_free_pages(zones, gfp_mask, &sc); +} + +#ifdef CONFIG_CONTAINER_MEM_CONT + +#ifdef CONFIG_HIGHMEM +#define ZONE_USERPAGES ZONE_HIGHMEM +#else +#define ZONE_USERPAGES ZONE_NORMAL +#endif + +unsigned long try_to_free_mem_container_pages(struct mem_container *mem_cont) +{ + struct scan_control sc = { + .gfp_mask = GFP_KERNEL, + .may_writepage = !laptop_mode, + .may_swap = 1, + .swap_cluster_max = SWAP_CLUSTER_MAX, + .swappiness = vm_swappiness, + .order = 1, + .mem_container = mem_cont, + .isolate_pages = mem_container_isolate_pages, + }; + int node; + struct zone **zones; + + for_each_online_node(node) { + zones = NODE_DATA(node)->node_zonelists[ZONE_USERPAGES].zones; + if (do_try_to_free_pages(zones, sc.gfp_mask, &sc)) + return 1; + } + return 0; +} +#endif + /* * For kswapd, balance_pgdat() will work across all this node's zones until * they are all at pages_high. @@ -1250,6 +1324,8 @@ static unsigned long balance_pgdat(pg_da .swap_cluster_max = SWAP_CLUSTER_MAX, .swappiness = vm_swappiness, .order = order, + .mem_container = NULL, + .isolate_pages = isolate_pages_global, }; /* * temp_priority is used to remember the scanning priority at which diff -puN include/linux/res_counter.h~mem-control-lru-and-reclaim include/linux/res_counter.h --- linux-2.6.22-rc6/include/linux/res_counter.h~mem-control-lru-and-reclaim 2007-07-20 13:13:25.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/res_counter.h 2007-07-20 13:13:25.000000000 +0530 @@ -99,4 +99,27 @@ int res_counter_charge(struct res_counte void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val); void res_counter_uncharge(struct res_counter *counter, unsigned long val); +static inline bool res_counter_limit_check_locked(struct res_counter *cnt) +{ + if (cnt->usage < cnt->limit) + return true; + + return false; +} + +/* + * Helper function to detect if the container is within it's limit or + * not. It's currently called from container_rss_prepare() + */ +static inline bool res_counter_check_under_limit(struct res_counter *cnt) +{ + bool ret; + unsigned long flags; + + spin_lock_irqsave(&cnt->lock, flags); + ret = res_counter_limit_check_locked(cnt); + spin_unlock_irqrestore(&cnt->lock, flags); + return ret; +} + #endif diff -puN include/linux/mm_inline.h~mem-control-lru-and-reclaim include/linux/mm_inline.h _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 7/8] Memory controller OOM handling (v3)
From: Pavel Emelianov <xemul@openvz.org> Out of memory handling for containers over their limit. A task from the container over limit is chosen using the existing OOM logic and killed. TODO: 1. As discussed in the OLS BOF session, consider implementing a user space policy for OOM handling. Signed-off-by: Pavel Emelianov <xemul@openvz.org> Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/memcontrol.h | 1 + mm/memcontrol.c | 1 + mm/oom_kill.c | 42 ++++++++++++++++++++++++++++++++++++++---- 3 files changed, 40 insertions(+), 4 deletions(-) diff -puN include/linux/memcontrol.h~mem-control-out-of-memory include/linux/memcontrol.h --- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-out-of-memory 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:26.000000000 +0530 @@ -38,6 +38,7 @@ extern unsigned long mem_container_isola int mode, struct zone *z, struct mem_container *mem_cont, int active); +extern void mem_container_out_of_memory(struct mem_container *mem); #else /* CONFIG_CONTAINER_MEM_CONT */ static inline void mm_init_container(struct mm_struct *mm, diff -puN mm/memcontrol.c~mem-control-out-of-memory mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-out-of-memory 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:26.000000000 +0530 @@ -272,6 +272,7 @@ int mem_container_charge(struct page *pa continue; css_put(&mem->css); + mem_container_out_of_memory(mem); goto free_mp; } diff -puN mm/oom_kill.c~mem-control-out-of-memory mm/oom_kill.c --- linux-2.6.22-rc6/mm/oom_kill.c~mem-control-out-of-memory 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/oom_kill.c 2007-07-20 13:13:26.000000000 +0530 @@ -24,6 +24,7 @@ #include <linux/cpuset.h> #include <linux/module.h> #include <linux/notifier.h> +#include <linux/memcontrol.h> int sysctl_panic_on_oom; /* #define DEBUG */ @@ -47,7 +48,8 @@ int sysctl_panic_on_oom; * of least surprise ... (be careful when you change it) */ -unsigned long badness(struct task_struct *p, unsigned long uptime) +unsigned long badness(struct task_struct *p, unsigned long uptime, + struct mem_container *mem) { unsigned long points, cpu_time, run_time, s; struct mm_struct *mm; @@ -60,6 +62,13 @@ unsigned long badness(struct task_struct return 0; } +#ifdef CONFIG_CONTAINER_MEM_CONT + if (mem != NULL && mm->mem_container != mem) { + task_unlock(p); + return 0; + } +#endif + /* * The memory size of the process is the basis for the badness. */ @@ -204,7 +213,8 @@ static inline int constrained_alloc(stru * * (not docbooked, we don't want this one cluttering up the manual) */ -static struct task_struct *select_bad_process(unsigned long *ppoints) +static struct task_struct *select_bad_process(unsigned long *ppoints, + struct mem_container *mem) { struct task_struct *g, *p; struct task_struct *chosen = NULL; @@ -258,7 +268,7 @@ static struct task_struct *select_bad_pr if (p->oomkilladj == OOM_DISABLE) continue; - points = badness(p, uptime.tv_sec); + points = badness(p, uptime.tv_sec, mem); if (points > *ppoints || !chosen) { chosen = p; *ppoints = points; @@ -372,6 +382,30 @@ static int oom_kill_process(struct task_ return oom_kill_task(p); } +#ifdef CONFIG_CONTAINER_MEM_CONT +void mem_container_out_of_memory(struct mem_container *mem) +{ + unsigned long points = 0; + struct task_struct *p; + + container_lock(); + rcu_read_lock(); +retry: + p = select_bad_process(&points, mem); + if (PTR_ERR(p) == -1UL) + goto out; + + if (!p) + p = current; + + if (oom_kill_process(p, points, "Memory container out of memory")) + goto retry; +out: + rcu_read_unlock(); + container_unlock(); +} +#endif + static BLOCKING_NOTIFIER_HEAD(oom_notify_list); int register_oom_notifier(struct notifier_block *nb) @@ -444,7 +478,7 @@ retry: * Rambo mode: Shoot down a process and hope it solves whatever * issues we may have. */ - p = select_bad_process(&points); + p = select_bad_process(&points, NULL); if (PTR_ERR(p) == -1UL) goto out; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
[RFC][-mm PATCH 8/8] Add switch to control what type of pages to limit (v3)
Choose if we want cached pages to be accounted or not. By default both are accounted for. A new set of tunables are added. echo -n 1 > mem_control_type switches the accounting to account for only mapped pages echo -n 2 > mem_control_type switches the behaviour back Signed-off-by: <balbir@linux.vnet.ibm.com> --- include/linux/memcontrol.h | 9 +++ mm/filemap.c | 2 mm/memcontrol.c | 129 ++++++++++++++++++++++++++++++++++++++------- mm/swap_state.c | 2 4 files changed, 122 insertions(+), 20 deletions(-) diff -puN mm/memcontrol.c~mem-control-choose-rss-vs-rss-and-pagecache mm/memcontrol.c --- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-20 13:13:26.000000000 +0530 @@ -27,6 +27,8 @@ #include <linux/swap.h> #include <linux/spinlock.h> +#include <asm/uaccess.h> + struct container_subsys mem_container_subsys; /* @@ -57,6 +59,7 @@ struct mem_container { * spin_lock to protect the per container LRU */ spinlock_t lru_lock; + unsigned long control_type; /* control RSS or RSS+Pagecache */ }; /* @@ -70,6 +73,14 @@ struct meta_page { atomic_t ref_cnt; }; +enum { + MEM_CONTAINER_TYPE_UNSPEC = 0, + MEM_CONTAINER_TYPE_MAPPED, + MEM_CONTAINER_TYPE_ALL, + MEM_CONTAINER_TYPE_MAX, +} mem_control_type; + +static struct mem_container init_mem_container; static inline struct mem_container *mem_container_from_cont(struct container *cont) @@ -307,6 +318,22 @@ err: } /* + * See if the cached pages should be charged at all? + */ +int mem_container_cache_charge(struct page *page, struct mm_struct *mm) +{ + struct mem_container *mem; + if (!mm) + mm = &init_mm; + + mem = rcu_dereference(mm->mem_container); + if (mem->control_type & MEM_CONTAINER_TYPE_ALL) + return mem_container_charge(page, mm); + else + return 0; +} + +/* * Uncharging is always a welcome operation, we never complain, simply * uncharge. */ @@ -317,7 +344,9 @@ void mem_container_uncharge(struct meta_ unsigned long flags; /* - * This can happen for PAGE_ZERO + * This can happen for PAGE_ZERO. This can also handle cases when + * a page is not charged at all and we are switching between + * handling the control_type. */ if (!mp) return; @@ -356,26 +385,59 @@ static ssize_t mem_container_write(struc cft->private, userbuf, nbytes, ppos); } -static struct cftype mem_container_usage = { - .name = "mem_usage", - .private = RES_USAGE, - .read = mem_container_read, -}; +static ssize_t mem_control_type_write(struct container *cont, + struct cftype *cft, struct file *file, + const char __user *userbuf, + size_t nbytes, loff_t *pos) +{ + int ret; + char *buf, *end; + unsigned long tmp; + struct mem_container *mem; -static struct cftype mem_container_limit = { - .name = "mem_limit", - .private = RES_LIMIT, - .write = mem_container_write, - .read = mem_container_read, -}; + mem = mem_container_from_cont(cont); + buf = kmalloc(nbytes + 1, GFP_KERNEL); + ret = -ENOMEM; + if (buf == NULL) + goto out; -static struct cftype mem_container_failcnt = { - .name = "mem_failcnt", - .private = RES_FAILCNT, - .read = mem_container_read, -}; + buf[nbytes] = 0; + ret = -EFAULT; + if (copy_from_user(buf, userbuf, nbytes)) + goto out_free; + + ret = -EINVAL; + tmp = simple_strtoul(buf, &end, 10); + if (*end != '\0') + goto out_free; + + if (tmp <= MEM_CONTAINER_TYPE_UNSPEC || tmp >= MEM_CONTAINER_TYPE_MAX) + goto out_free; + + mem->control_type = tmp; + ret = nbytes; +out_free: + kfree(buf); +out: + return ret; +} -static struct mem_container init_mem_container; +static ssize_t mem_control_type_read(struct container *cont, + struct cftype *cft, + struct file *file, char __user *userbuf, + size_t nbytes, loff_t *ppos) +{ + unsigned long val; + char buf[64], *s; + struct mem_container *mem; + + mem = mem_container_from_cont(cont); + s = buf; + val = mem->control_type; + s += sprintf(s, "%lu\n", val); + return simple_read_from_buffer((void __user *)userbuf, nbytes, + ppos, buf, s - buf); +} static int mem_container_create(struct container_subsys *ss, struct container *cont) @@ -398,9 +460,36 @@ static int mem_container_create(struct c INIT_LIST_HEAD(&mem->active_list); INIT_LIST_HEAD(&mem->inactive_list); spin_lock_init(&mem->lru_lock); + mem->control_type = MEM_CONTAINER_TYPE_ALL; return 0; } +static struct cftype mem_container_usage = { + .name = "mem_usage", + .private = RES_USAGE, + .read = mem_container_read, +}; + +static struct cftype mem_container_limit = { + .name = "mem_limit", + .private = RES_LIMIT, + .write = mem_container_write, + .read = mem_container_read, +}; + +static struct cftype mem_container_control_type = { + .name = "mem_control_type", + .write = mem_control_type_write, + .read = mem_control_type_read, +}; + +static struct cftype mem_container_failcnt = { + .name = "mem_failcnt", + .private = RES_FAILCNT, + .read = mem_container_read, +}; + + static void mem_container_destroy(struct container_subsys *ss, struct container *cont) { @@ -424,6 +513,10 @@ static int mem_container_populate(struct if (rc < 0) goto err; + rc = container_add_file(cont, &mem_container_control_type); + if (rc < 0) + goto err; + err: return rc; } diff -puN include/linux/memcontrol.h~mem-control-choose-rss-vs-rss-and-pagecache include/linux/memcontrol.h --- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-20 13:13:26.000000000 +0530 @@ -20,6 +20,8 @@ #ifndef _LINUX_MEMCONTROL_H #define _LINUX_MEMCONTROL_H +#include <linux/mm.h> + struct mem_container; struct meta_page; @@ -39,6 +41,7 @@ extern unsigned long mem_container_isola struct mem_container *mem_cont, int active); extern void mem_container_out_of_memory(struct mem_container *mem); +extern int mem_container_cache_charge(struct page *page, struct mm_struct *mm); #else /* CONFIG_CONTAINER_MEM_CONT */ static inline void mm_init_container(struct mm_struct *mm, @@ -73,6 +76,12 @@ static inline void mem_container_move_li { } +static inline int mem_container_cache_charge(struct page *page, + struct mm_struct *mm) +{ + return 0; +} + #endif /* CONFIG_CONTAINER_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */ diff -puN mm/swap_state.c~mem-control-choose-rss-vs-rss-and-pagecache mm/swap_state.c --- linux-2.6.22-rc6/mm/swap_state.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/swap_state.c 2007-07-20 13:13:26.000000000 +0530 @@ -81,7 +81,7 @@ static int __add_to_swap_cache(struct pa error = radix_tree_preload(gfp_mask); if (!error) { - error = mem_container_charge(page, current->mm); + error = mem_container_cache_charge(page, current->mm); if (error) goto out; diff -puN mm/filemap.c~mem-control-choose-rss-vs-rss-and-pagecache mm/filemap.c --- linux-2.6.22-rc6/mm/filemap.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-20 13:13:26.000000000 +0530 +++ linux-2.6.22-rc6-balbir/mm/filemap.c 2007-07-20 13:13:26.000000000 +0530 @@ -445,7 +445,7 @@ int add_to_page_cache(struct page *page, if (error == 0) { - error = mem_container_charge(page, current->mm); + error = mem_container_cache_charge(page, current->mm); if (error) goto out; _ -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
Re: [RFC][-mm PATCH 4/8] Memory controller memory accounting (v3)
On 7/20/07, Balbir Singh <balbir@linux.vnet.ibm.com> wrote: > +void __always_inline unlock_meta_page(struct page *page) > +{ > + bit_spin_unlock(PG_metapage, &page->flags); > +} Maybe add a BUG_ON(!test_bit(PG_metapage, &page->flags)) at least for development? > + mem = rcu_dereference(mm->mem_container); > + /* > + * For every charge from the container, increment reference > + * count > + */ > + css_get(&mem->css); > + rcu_read_unlock(); It's not clear to me that this is safe. If > + > + /* > + * If we created the meta_page, we should free it on exceeding > + * the container limit. > + */ > + if (res_counter_charge(&mem->res, 1)) { > + css_put(&mem->css); > + goto free_mp; > + } > + > + lock_meta_page(page); > + /* > + * Check if somebody else beat us to allocating the meta_page > + */ > + if (page_get_meta_page(page)) { I think you need to add something like kfree(mp); mp = page_get_meta_page(page); otherwise you're going to leak the new but unneeded metapage. > + atomic_inc(&mp->ref_cnt); > + res_counter_uncharge(&mem->res, 1); > + goto done; > + } > + > + atomic_set(&mp->ref_cnt, 1); > + mp->mem_container = mem; > + mp->page = page; > + page_assign_meta_page(page, mp); Would it make sense to have the "mp->page = page" be part of page_assign_meta_page() for consistency? > +err: > + unlock_meta_page(page); > + return -ENOMEM; The only jump to err: is from a location where the metapage is already unlocked. Maybe scrap err: and just do a return -ENOMEM when the allocation fails? > +out_uncharge: > + mem_container_uncharge(page_get_meta_page(page)); Wanting to call mem_container_uncharge() on a page and hence having to call page_get_meta_page() seems to be more common than wanting to call it on a meta page that you already have available. Maybe make mem_container_uncharge() be a wrapper that take a struct page and does something like mem_container_uncharge_mp(page_get_meta_page(page)) where mem_container_uncharge_mp() is the raw meta-page version? Paul _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
On 7/20/07, Paul Menage <menage@google.com> wrote: > > + mem = rcu_dereference(mm->mem_container); > > + /* > > + * For every charge from the container, increment reference > > + * count > > + */ > > + css_get(&mem->css); > > + rcu_read_unlock(); > > It's not clear to me that this is safe. > Sorry, didn't finish this thought. Right after the rcu_dereference() the mm could be moved to another container by some other process. Since there's an rcu_synchronize() after the movement, and the rcu_synchronize() caller holds container_mutex then I guess it's not possible for a third process to delete the container during the RCU section, since it won't be able to acquire the mutex until after the RCU read section completes. So OK, it is safe, at least based on the guarantees made by the current implementation. Paul _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
Re: [RFC][-mm PATCH 8/8] Add switch to control what type of pages to limit (v3)
On 7/20/07, Balbir Singh <balbir@linux.vnet.ibm.com> wrote: > -static struct mem_container init_mem_container; > +static ssize_t mem_control_type_read(struct container *cont, > + struct cftype *cft, > + struct file *file, char __user *userbuf, > + size_t nbytes, loff_t *ppos) > +{ > + unsigned long val; > + char buf[64], *s; > + struct mem_container *mem; > + > + mem = mem_container_from_cont(cont); > + s = buf; > + val = mem->control_type; > + s += sprintf(s, "%lu\n", val); > + return simple_read_from_buffer((void __user *)userbuf, nbytes, > + ppos, buf, s - buf); > +} This could just use the read_uint64() hook and be something like static u64 mem_container_control_type_read(struct container *cont, struct cftype *cft) { return mem_container_from_cont(cont)->control_type; } Paul _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
Paul Menage wrote: > On 7/20/07, Balbir Singh <balbir@linux.vnet.ibm.com> wrote: > >> +void __always_inline unlock_meta_page(struct page *page) >> +{ >> + bit_spin_unlock(PG_metapage, &page->flags); >> +} > > Maybe add a BUG_ON(!test_bit(PG_metapage, &page->flags)) at least for > development? > I'd rather make that a VM_BUG_ON, but that's a good suggestion >> + mem = rcu_dereference(mm->mem_container); >> + /* >> + * For every charge from the container, increment reference >> + * count >> + */ >> + css_get(&mem->css); >> + rcu_read_unlock(); > > It's not clear to me that this is safe. > > If > >> + >> + /* >> + * If we created the meta_page, we should free it on exceeding >> + * the container limit. >> + */ >> + if (res_counter_charge(&mem->res, 1)) { >> + css_put(&mem->css); >> + goto free_mp; >> + } >> + >> + lock_meta_page(page); >> + /* >> + * Check if somebody else beat us to allocating the meta_page >> + */ >> + if (page_get_meta_page(page)) { > > I think you need to add something like > > kfree(mp); > mp = page_get_meta_page(page); > > otherwise you're going to leak the new but unneeded metapage. > Yes, good catch! I am surprised I did not check for that. >> + atomic_inc(&mp->ref_cnt); >> + res_counter_uncharge(&mem->res, 1); >> + goto done; >> + } >> + >> + atomic_set(&mp->ref_cnt, 1); >> + mp->mem_container = mem; >> + mp->page = page; >> + page_assign_meta_page(page, mp); > > Would it make sense to have the "mp->page = page" be part of > page_assign_meta_page() for consistency? > Yes, that could be done easily. >> +err: >> + unlock_meta_page(page); >> + return -ENOMEM; > > The only jump to err: is from a location where the metapage is already > unlocked. Maybe scrap err: and just do a return -ENOMEM when the > allocation fails? > Sounds good, let me revisit the code. >> +out_uncharge: >> + mem_container_uncharge(page_get_meta_page(page)); > > Wanting to call mem_container_uncharge() on a page and hence having to > call page_get_meta_page() seems to be more common than wanting to call > it on a meta page that you already have available. Maybe make > mem_container_uncharge() be a wrapper that take a struct page and does > something like mem_container_uncharge_mp(page_get_meta_page(page)) > where mem_container_uncharge_mp() is the raw meta-page version? > Yes.. right! Will do, I'll write a wrapper. > Paul -- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
Re: [RFC][-mm PATCH 6/8] Memory controller add per container LRU and reclaim (v3)
hi, > +unsigned long mem_container_isolate_pages(unsigned long nr_to_scan, > + struct list_head *dst, > + unsigned long *scanned, int order, > + int mode, struct zone *z, > + struct mem_container *mem_cont, > + int active) > +{ > + unsigned long nr_taken = 0; > + struct page *page; > + unsigned long scan; > + LIST_HEAD(mp_list); > + struct list_head *src; > + struct meta_page *mp; > + > + if (active) > + src = &mem_cont->active_list; > + else > + src = &mem_cont->inactive_list; > + > + for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) { > + mp = list_entry(src->prev, struct meta_page, lru); > + page = mp->page; > + - is it safe to pick the lists without mem_cont->lru_lock held? - what prevents mem_container_uncharge from freeing this meta_page behind us? YAMAMOTO Takashi _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers
YAMAMOTO Takashi wrote: > hi, > >> +unsigned long mem_container_isolate_pages(unsigned long nr_to_scan, >> + struct list_head *dst, >> + unsigned long *scanned, int order, >> + int mode, struct zone *z, >> + struct mem_container *mem_cont, >> + int active) >> +{ >> + unsigned long nr_taken = 0; >> + struct page *page; >> + unsigned long scan; >> + LIST_HEAD(mp_list); >> + struct list_head *src; >> + struct meta_page *mp; >> + >> + if (active) >> + src = &mem_cont->active_list; >> + else >> + src = &mem_cont->inactive_list; >> + >> + for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) { >> + mp = list_entry(src->prev, struct meta_page, lru); >> + page = mp->page; >> + > > - is it safe to pick the lists without mem_cont->lru_lock held? > > - what prevents mem_container_uncharge from freeing this meta_page > behind us? > > YAMAMOTO Takashi Hi, YAMAMOTO, We do take the lru_lock before deleting the page from the list and in mem_container_move_lists(). But, I guess like you point out page = mp->page might not be a safe operation. I'll fix the problem in the next release. Thanks for the review, -- Balbir Singh Linux Technology Center IBM, ISTL _______________________________________________ Containers mailing list Containers@lists.linux-foundation.org https://lists.linux-foundation.org/mailman/listinfo/containers