Re: [PATCH] mm: skip zombie in OOM-killer

[David Rientjes <rientjes@google.com>]

On Mon, 7 Mar 2011, Andrew Morton wrote:

> Andrew's v2 doesn't apply on top of
> oom-prevent-unnecessary-oom-kills-or-kernel-panics.patch and I'm
> disinclined to fix that up and merge some untested patch combination.
> 

Ok.  Andrey, I rebased your patch on top of the latest -mm tree 
(mmotm-2011-03-02-16-52 with 
oom-prevent-unnecessary-oom-kills-or-kernel-panics.patch from 
http://marc.info/?l=linux-mm-commits&m=129953480527038&q=raw) and rewrote 
the changelog.  They'll both apply on top of Linus' -git even without 
mmotm.  Could you try this out on your testcase?

Thanks!


oom: skip zombies when iterating tasklist

From: Andrey Vagin <avagin@openvz.org>

We shouldn't defer oom killing if a thread has already detached its ->mm
and still has TIF_MEMDIE set.  Memory needs to be freed, so find kill
other threads that pin the same ->mm or find another task to kill.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: David Rientjes <rientjes@google.com>
---
 mm/oom_kill.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -299,6 +299,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 	do_each_thread(g, p) {
 		unsigned int points;
 
+		if (!p->mm)
+			continue;
 		if (oom_unkillable_task(p, mem, nodemask))
 			continue;
 
@@ -324,7 +326,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
 		 * the process of exiting and releasing its resources.
 		 * Otherwise we could get an easy OOM deadlock.
 		 */
-		if ((p->flags & PF_EXITING) && p->mm) {
+		if (p->flags & PF_EXITING) {
 			if (p != current)
 				return ERR_PTR(-1UL);
 

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