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| author | Oleg Nesterov <oleg@redhat.com> | 2010-08-09 17:18:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-09 20:44:55 -0700 |
| commit | b52279406e77be711c068f9a8e970ea6471e089c (patch) | |
| tree | 5f44a8af51ccc30847b1d969e0bd36205902d3fb | |
| parent | 455c0e5fb03b67fa62bd12e3abe3fa484b9960c5 (diff) | |
| download | blackbird-op-linux-b52279406e77be711c068f9a8e970ea6471e089c.tar.gz blackbird-op-linux-b52279406e77be711c068f9a8e970ea6471e089c.zip | |
oom: PF_EXITING check should take mm into account
select_bad_process() checks PF_EXITING to detect the task which is going
to release its memory, but the logic is very wrong.
- a single process P with the dead group leader disables
select_bad_process() completely, it will always return
ERR_PTR() while P can live forever
- if the PF_EXITING task has already released its ->mm
it doesn't make sense to expect it is goiing to free
more memory (except task_struct/etc)
Change the code to ignore the PF_EXITING tasks without ->mm.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/oom_kill.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 7c0dc414dba8..0a6e466155d2 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -287,7 +287,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints, * the process of exiting and releasing its resources. * Otherwise we could get an easy OOM deadlock. */ - if (p->flags & PF_EXITING) { + if ((p->flags & PF_EXITING) && p->mm) { if (p != current) return ERR_PTR(-1UL); |
