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From: David Rientjes on 2 Apr 2010 17:30
An oom_badness() score of 0 means "never kill" according to
Documentation/filesystems/proc.txt, so exclude it from being selected for
kill. These tasks have either detached their p->mm or are set to
OOM_DISABLE.

Also removes an unnecessary initialization of points to 0 in
mem_cgroup_out_of_memory(), select_bad_process() does this already.

Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com>
Signed-off-by: David Rientjes <rientjes(a)google.com>
---
mm/oom_kill.c | 13 ++-----------
1 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -326,17 +326,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
*ppoints = 1000;
}

- /*
- * skip kernel threads and tasks which have already released
- * their mm.
- */
- if (!p->mm)
- continue;
- if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
- continue;
-
points = oom_badness(p, totalpages);
- if (points > *ppoints || !chosen) {
+ if (points > *ppoints) {
chosen = p;
*ppoints = points;
}
@@ -478,7 +469,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
{
unsigned long limit;
- unsigned int points = 0;
+ unsigned int points;
struct task_struct *p;

if (sysctl_panic_on_oom == 2)
--
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