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memcg: use find_lock_task_mm() in memory cgroups oom

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When the OOM killer scans task, it check a task is under memcg or
not when it's called via memcg's context.

But, as Oleg pointed out, a thread group leader may have NULL ->mm
and task_in_mem_cgroup() may do wrong decision. We have to use
find_lock_task_mm() in memcg as generic OOM-Killer does.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.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 2010-08-10 18:03:00 -07:00 committed by Linus Torvalds
parent 73045c47b6
commit 158e0a2d1b
3 changed files with 10 additions and 4 deletions
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2
include/linux/oom.h
View file

@ -66,6 +66,8 @@ static inline void oom_killer_enable(void)
extern unsigned long badness(struct task_struct *p, struct mem_cgroup *mem,
const nodemask_t *nodemask, unsigned long uptime);
extern struct task_struct *find_lock_task_mm(struct task_struct *p);
/* sysctls */
extern int sysctl_oom_dump_tasks;
extern int sysctl_oom_kill_allocating_task;

10
mm/memcontrol.c
View file

@ -47,6 +47,7 @@
#include <linux/mm_inline.h>
#include <linux/page_cgroup.h>
#include <linux/cpu.h>
#include <linux/oom.h>
#include "internal.h"
#include <asm/uaccess.h>
@ -838,10 +839,13 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
{
int ret;
struct mem_cgroup *curr = NULL;
struct task_struct *p;
task_lock(task);
curr = try_get_mem_cgroup_from_mm(task->mm);
task_unlock(task);
p = find_lock_task_mm(task);
if (!p)
return 0;
curr = try_get_mem_cgroup_from_mm(p->mm);
task_unlock(p);
if (!curr)
return 0;
/*

2
mm/oom_kill.c
View file

@ -106,7 +106,7 @@ static void boost_dying_task_prio(struct task_struct *p,
* pointer. Return p, or any of its subthreads with a valid ->mm, with
* task_lock() held.
*/
static struct task_struct *find_lock_task_mm(struct task_struct *p)
struct task_struct *find_lock_task_mm(struct task_struct *p)
{
struct task_struct *t = p;