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authorMichal Hocko <mhocko@suse.com>2016-07-29 01:44:46 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-29 02:07:41 +0300
commitb18dc5f291c07ddaf31562b9f27b3a122f1f9b7e (patch)
tree662d9000ce928c625fafa33c71f33c30db2b95bd /mm/oom_kill.c
parent44a70adec910d6929689e42b6e5cee5b7d202d20 (diff)
downloadlinux-b18dc5f291c07ddaf31562b9f27b3a122f1f9b7e.tar.xz
mm, oom: skip vforked tasks from being selected
vforked tasks are not really sitting on any memory. They are sharing the mm with parent until they exec into a new code. Until then it is just pinning the address space. OOM killer will kill the vforked task along with its parent but we still can end up selecting vforked task when the parent wouldn't be selected. E.g. init doing vfork to launch a task or vforked being a child of oom unkillable task with an updated oom_score_adj to be killable. Add a new helper to check whether a task is in the vfork sharing memory with its parent and use it in oom_badness to skip over these tasks. Link: http://lkml.kernel.org/r/1466426628-15074-6-git-send-email-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: David Rientjes <rientjes@google.com> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> 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.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index d8220c5603a5..02da660b7c25 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -176,11 +176,13 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
/*
* Do not even consider tasks which are explicitly marked oom
- * unkillable or have been already oom reaped.
+ * unkillable or have been already oom reaped or the are in
+ * the middle of vfork
*/
adj = (long)p->signal->oom_score_adj;
if (adj == OOM_SCORE_ADJ_MIN ||
- test_bit(MMF_OOM_REAPED, &p->mm->flags)) {
+ test_bit(MMF_OOM_REAPED, &p->mm->flags) ||
+ in_vfork(p)) {
task_unlock(p);
return 0;
}