linux-kernel - Re: oomkillers gone wild.

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Date:	Mon, 4 Jun 2012 16:30:57 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: oomkillers gone wild.

On Mon, 4 Jun 2012, Dave Jones wrote:

> we picked this..
> 
> [21623.066911] [  588]     0   588    22206        1   2       0             0 dhclient
> 
> over say..
> 
> [21623.116597] [ 7092]  1000  7092  1051124    31660   3       0             0 trinity-child3
> 
> What went wrong here ?
> 
> And why does that score look so.. weird.
> 

It sounds like it's because pid 588 has uid=0 and the adjustment for root 
processes is causing an overflow.  I assume this fixes it?
---
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -183,7 +183,7 @@ static bool oom_unkillable_task(struct task_struct *p,
 unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
 			  const nodemask_t *nodemask, unsigned long totalpages)
 {
-	unsigned long points;
+	long points;
 
 	if (oom_unkillable_task(p, memcg, nodemask))
 		return 0;
@@ -223,7 +223,7 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
 	 * Never return 0 for an eligible task regardless of the root bonus and
 	 * oom_score_adj (oom_score_adj can't be OOM_SCORE_ADJ_MIN here).
 	 */
-	return points ? points : 1;
+	return points > 0 ? points : 1;
 }
 
 /*
--
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