linux-kernel - Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels

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Message-ID: <alpine.DEB.2.00.1007261510320.2993@chino.kir.corp.google.com>
Date:	Mon, 26 Jul 2010 15:12:01 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	dave b <db.pub.mail@...il.com>
cc:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: PROBLEM: oom killer and swap weirdness on 2.6.3* kernels

On Tue, 27 Jul 2010, dave b wrote:

> Actually it turns out on 2.6.34.1 I can trigger this issue. What it
> really is, is that linux doesn't invoke the oom killer when it should
> and kill something off. This is *really* annoying.
> 

I'm not exactly sure what you're referring to, it's been two months and 
you're using a new kernel and now you're saying that the oom killer isn't 
being utilized when the original problem statement was that it was killing 
things inappropriately?

> I used the follow script - (on 2.6.34.1)
> cat ./scripts/disable_over_commit
> #!/bin/bash
> echo 2 > /proc/sys/vm/overcommit_memory
> echo 40 > /proc/sys/vm/dirty_ratio
> echo 5 > /proc/sys/vm/dirty_background_ratio
> 
> And I was still able to reproduce this bug.
> Here is some c  code to trigger the condition I am talking about.
> 
> 
> #include <stdlib.h>
> #include <stdio.h>
> 
> int main(void)
> {
> 	while(1)
> 	{
> 		malloc(1000);
> 	}
> 
> 	return 0;
> }
> 
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