Home » Mailing lists » Devel » Roadmap for features planed for containers where and Some future features ideas.
| Re: Roadmap for features planed for containers where and Some future features ideas. [message #32146 is a reply to message #32131] |
Wed, 23 July 2008 00:56  |
Peter Dolding
Messages: 7
Registered: October 2007
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Junior Member |
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From: Kirill A. Shutemov <kirill@shutemov.name>
Changelog:
v4:
- hierarchy support
- drop dummy_timer_slack_check()
- workaround lockdep false (?) positive
- allow 0 as timer slack value
v3:
- rework interface
- s/EXPORT_SYMBOL/EXPORT_SYMBOL_GPL/
v2:
- fixed with CONFIG_CGROUP_TIMER_SLACK=y
v1:
- initial revision
Kirill A. Shutemov (2):
cgroups: export cgroup_iter_{start,next,end}
cgroups: introduce timer slack subsystem
include/linux/cgroup_subsys.h | 6 +
include/linux/init_task.h | 4 +-
init/Kconfig | 10 ++
kernel/Makefile | 1 +
kernel/cgroup.c | 3 +
kernel/cgroup_timer_slack.c | 262 +++++++++++++++++++++++++++++++++++++++++
kernel/sys.c | 19 ++-
7 files changed, 298 insertions(+), 7 deletions(-)
create mode 100644 kernel/cgroup_timer_slack.c
--
1.7.3.5
_______________________________________________
Containers mailing list
Containers@lists.linux-foundation.org
https://lists.linux-foundation.org/mailman/listinfo/containe rsFrom: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
kernel/cgroup.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b24d702..8234daa 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2443,6 +2443,7 @@ void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it)
it->cg_link = &cgrp->css_sets;
cgroup_advance_iter(cgrp, it);
}
+EXPORT_SYMBOL_GPL(cgroup_iter_start);
struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
struct cgroup_iter *it)
@@ -2467,11 +2468,13 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
}
return res;
}
+EXPORT_SYMBOL_GPL(cgroup_iter_next);
void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it)
{
read_unlock(&css_set_lock);
}
+EXPORT_SYMBOL_GPL(cgroup_iter_end);
static inline int started_after_time(struct task_struct *t1,
struct timespec *time,
--
1.7.3.5
_______________________________________________
Containers mailing list
Containers@lists.linux-foundation.org
https://lists.linux-foundation.org/mailman/listinfo/containe rsFrom: Kirill A. Shutemov <kirill@shutemov.name>
Provides a way of tasks grouping by timer slack value. Introduces per
cgroup max and min timer slack value. When a task attaches to a cgroup,
its timer slack value adjusts (if needed) to fit min-max range.
It also provides a way to set timer slack value for all tasks in the
cgroup at once.
This functionality is useful in mobile devices where certain background
apps are attached to a cgroup and minimum wakeups are desired.
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Idea-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
include/linux/cgroup_subsys.h | 6 +
include/linux/init_task.h | 4 +-
init/Kconfig | 10 ++
kernel/Makefile | 1 +
kernel/cgroup_timer_slack.c | 262 +++++++++++++++++++++++++++++++++++++++++
kernel/sys.c | 19 ++-
6 files changed, 295 insertions(+), 7 deletions(-)
create mode 100644 kernel/cgroup_timer_slack.c
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index ccefff0..e399228 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -66,3 +66,9 @@ SUBSYS(blkio)
#endif
/* */
+
+#ifdef CONFIG_CGROUP_TIMER_SLACK
+SUBSYS(timer_slack)
+#endif
+
+/* */
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index caa151f..48eca8f 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -124,6 +124,8 @@ extern struct cred init_cred;
# define INIT_PERF_EVENTS(tsk)
#endif
+#define TIMER_SLACK_NS_DEFAULT 50000
+
/*
* INIT_TASK is used to set up the first task table, touch at
* your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -177,7 +179,7 @@ extern struct cred init_cred;
.cpu_timers = INIT_CPU_TIMERS(tsk.cpu_timers), \
.fs_excl = ATOMIC_INIT(0), \
.pi_lock = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock), \
- .timer_slack_ns = 50000, /* 50 usec default slack */ \
+ .timer_slack_ns = TIMER_SLACK_NS_DEFAULT, \
.pids = { \
[PIDTYPE_PID] = INIT_PID_LINK(PIDTYPE_PID), \
[PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID), \
diff --git a/init/Kconfig b/init/Kconfig
index be788c0..6cf465f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -596,6 +596,16 @@ config CGROUP_FREEZER
Provides a way to freeze and unfreeze all tasks in a
cgroup.
+config CGROUP_TIMER_SLACK
+ tristate "Timer slack cgroup subsystem"
+ help
+ Provides a way of tasks grouping by timer slack value.
+ Introduces per cgroup timer slack value which will override
+ the default timer slack value once a task is attached to a
+ cgroup.
+ It's useful in mobile devices where certain background apps
+ are attached to a cgroup and combined wakeups are desired.
+
config CGROUP_DEVICE
bool "Device controller for cgroups"
help
diff --git a/kernel/Makefile b/kernel/Makefile
index 353d3fe..0b60239 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
obj-$(CONFIG_COMPAT) += compat.o
obj-$(CONFIG_CGROUPS) += cgroup.o
obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
+obj-$(CONFIG_CGROUP_TIMER_SLACK) += cgroup_timer_slack.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
obj-$(CONFIG_UTS_NS) += utsname.o
diff --git a/kernel/cgroup_timer_slack.c b/kernel/cgroup_timer_slack.c
new file mode 100644
index 0000000..affd33a
--- /dev/null
+++ b/kernel/cgroup_timer_slack.c
@@ -0,0 +1,262 @@
+/*
+ * cgroup_timer_slack.c - control group timer slack subsystem
+ *
+ * Copyright Nokia Corparation, 2011
+ * Author: Kirill A. Shutemov
+ *
+ * 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/cgroup.h>
+#include <linux/init_task.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/rcupdate.h>
+
+struct cgroup_subsys timer_slack_subsys;
+struct timer_slack_cgroup {
+ struct cgroup_subsys_state css;
+ unsigned long min_slack_ns;
+ unsigned long max_slack_ns;
+};
+
+enum {
+ TIMER_SLACK_MIN,
+ TIMER_SLACK_MAX,
+};
+
+extern int (*timer_slack_check)(struct task_struct *task,
+ unsigned long slack_ns);
+
+static struct timer_slack_cgroup *cgroup_to_tslack_cgroup(struct cgroup *cgroup)
+{
+ struct cgroup_subsys_state *css;
+
+ css = cgroup_subsys_state(cgroup, timer_slack_subsys.subsys_id);
+ return container_of(css, struct timer_slack_cgroup, css);
+}
+
+static int is_timer_slack_allowed(struct timer_slack_cgroup *t
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