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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2010-08-10 04:19:33 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-10 07:45:00 +0400
commit7c59aec830c7ed6c745bd513982cee3563ed20c1 (patch)
treef06d2c626d0ab0ff2f9880d98a50e60be4af7816 /mm/oom_kill.c
parent1489fa14cb757b496c8fa2b63097dbcee6690695 (diff)
downloadlinux-7c59aec830c7ed6c745bd513982cee3563ed20c1.tar.xz
oom: don't try to kill oom_unkillable child
Presently, badness() doesn't care about either CPUSET nor mempolicy. Then if the victim child process have disjoint nodemask, OOM Killer might kill innocent process. This patch fixes it. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: David Rientjes <rientjes@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/oom_kill.c')
-rw-r--r--mm/oom_kill.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 26ae6975fa32..6e9f16a910e0 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -429,7 +429,7 @@ static int oom_kill_task(struct task_struct *p)
static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
unsigned long points, struct mem_cgroup *mem,
- const char *message)
+ nodemask_t *nodemask, const char *message)
{
struct task_struct *victim = p;
struct task_struct *child;
@@ -469,6 +469,8 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
continue;
if (mem && !task_in_mem_cgroup(child, mem))
continue;
+ if (!has_intersects_mems_allowed(child, nodemask))
+ continue;
/* badness() returns 0 if the thread is unkillable */
child_points = badness(child, uptime.tv_sec);
@@ -519,7 +521,7 @@ retry:
if (!p || PTR_ERR(p) == -1UL)
goto out;
- if (oom_kill_process(p, gfp_mask, 0, points, mem,
+ if (oom_kill_process(p, gfp_mask, 0, points, mem, NULL,
"Memory cgroup out of memory"))
goto retry;
out:
@@ -679,6 +681,7 @@ void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask,
* the tasklist scan.
*/
if (!oom_kill_process(current, gfp_mask, order, 0, NULL,
+ nodemask,
"Out of memory (oom_kill_allocating_task)"))
return;
}
@@ -697,7 +700,7 @@ retry:
panic("Out of memory and no killable processes...\n");
}
- if (oom_kill_process(p, gfp_mask, order, points, NULL,
+ if (oom_kill_process(p, gfp_mask, order, points, NULL, nodemask,
"Out of memory"))
goto retry;
read_unlock(&tasklist_lock);