linux-kernel - [PATCH] oom-killer kills more than needed

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Date:	Mon, 29 Sep 2008 16:09:59 -0700
From:	"Chad Zanonie" <chad.zanonie@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] oom-killer kills more than needed

Signed-off-by: Chad Zanonie

This mod firstly replaces a !p->mm check with PF_KTHREAD to more
accurately identify
kthreads. Secondly, it adds a (p->state & TASK_DEAD) check to identify processes
that have released their mm entirely.  Not waiting for a process to finish
releasing its memory entirely can cause the OOM killer to kill another
application unnecessarily (while p->mm is null but memory isn't yet available).


diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 64e5b4b..f325a87 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -216,7 +216,7 @@ static struct task_struct
*select_bad_process(unsigned long *ppoints,
                 * skip kernel threads and tasks which have already released
                 * their mm.
                 */
-               if (!p->mm)
+               if (p->flags & PF_KTHREAD || p->state & TASK_DEAD)
                        continue;
                /* skip the init task */
                if (is_global_init(p))
--
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