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memcg: fix OOM killer under memcg

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This patch tries to fix OOM Killer problems caused by hierarchy.
Now, memcg itself has OOM KILL function (in oom_kill.c) and tries to
kill a task in memcg.

But, when hierarchy is used, it's broken and correct task cannot
be killed. For example, in following cgroup

	/groupA/	hierarchy=1, limit=1G,
		01	nolimit
		02	nolimit
All tasks' memory usage under /groupA, /groupA/01, groupA/02 is limited to
groupA's 1Gbytes but OOM Killer just kills tasks in groupA.

This patch provides makes the bad process be selected from all tasks
under hierarchy. BTW, currently, oom_jiffies is updated against groupA
in above case. oom_jiffies of tree should be updated.

To see how oom_jiffies is used, please check mem_cgroup_oom_called()
callers.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: const fix]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KAMEZAWA Hiroyuki
2009-04-02 16:57:38 -07:00
committed by Linus Torvalds
parent 81d39c20f5
commit 0b7f569e45
4 changed files with 49 additions and 5 deletions
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30
mm/memcontrol.c
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@@ -295,6 +295,9 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
{
struct mem_cgroup *mem = NULL;
if (!mm)
return NULL;
/*
* Because we have no locks, mm->owner's may be being moved to other
* cgroup. We use css_tryget() here even if this looks
@@ -486,10 +489,20 @@ void mem_cgroup_move_lists(struct page *page,
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
{
int ret;
struct mem_cgroup *curr = NULL;
task_lock(task);
ret = task->mm && mm_match_cgroup(task->mm, mem);
rcu_read_lock();
curr = try_get_mem_cgroup_from_mm(task->mm);
rcu_read_unlock();
task_unlock(task);
if (!curr)
return 0;
if (curr->use_hierarchy)
ret = css_is_ancestor(&curr->css, &mem->css);
else
ret = (curr == mem);
css_put(&curr->css);
return ret;
}
@@ -820,6 +833,19 @@ bool mem_cgroup_oom_called(struct task_struct *task)
rcu_read_unlock();
return ret;
}
static int record_last_oom_cb(struct mem_cgroup *mem, void *data)
{
mem->last_oom_jiffies = jiffies;
return 0;
}
static void record_last_oom(struct mem_cgroup *mem)
{
mem_cgroup_walk_tree(mem, NULL, record_last_oom_cb);
}
/*
* Unlike exported interface, "oom" parameter is added. if oom==true,
* oom-killer can be invoked.
@@ -902,7 +928,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
mutex_lock(&memcg_tasklist);
mem_cgroup_out_of_memory(mem_over_limit, gfp_mask);
mutex_unlock(&memcg_tasklist);
mem_over_limit->last_oom_jiffies = jiffies;
record_last_oom(mem_over_limit);
}
goto nomem;
}