linux-kernel - Re: oom_killer crash linux system

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Message-ID: <20101020050518.GD5796@rcwf64-moto>
Date:	Wed, 20 Oct 2010 14:05:18 +0900
From:	Adam Jiang <jiang.adam@...il.com>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	figo1802 <figo1802@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: oom_killer crash linux system

On Wed, Oct 20, 2010 at 11:43:45AM +0800, Figo.zhang wrote:
> 
> > > active_anon:398375 inactive_anon:82967 isolated_anon:0 
> > >  active_file:81 inactive_file:429 isolated_file:32
> > >  unevictable:13 dirty:2 writeback:14 unstable:0
> > >  free:11942 slab_reclaimable:2391 slab_unreclaimable:3303
> > >  mapped:5617 shmem:33909 pagetables:2280 bounce:0
> > 
> > active_anon + inactive_anon + isolated_anon = 481342 pages ~= 1.8GB
> > Um, this oom doesn't makes accounting lost.
> > 
> > >              total	    515071     2011
> > 
> > page-types show similar result.
> > 
> > 
> > The big difference is, previous and current are showing some different processes.
> > only previous has VirtualBox, only current has vmware-usbarbit, etc..
> > 
> > Can you use same test environment?
> yes, it is the same desktop, and i open some pdf files and applications
> by random. 
> 
> but when my desktop eat up to 1.8GB RAM (active_anon + inactive_anon +
> isolated_anon = 481342 pages >= 1.8GB), the system became extraordinary
> slow. when i move the mouse, the mouse cant move a little on screen. i
> deem it have "crashed", but i ping it's ip by other desktop, it is ok.
> 
> so what is apect affect the system seem to "crashed", page-writeback?
> page-reclaimed?  and the oom-killer seem to be very conservative? in
> that condition , oom_killer must kill some process to release memory for
> new process.

I think it just simply the test caused system *almost* dead but not
really trigger oom-killer. You have 2GB RAM, right. 0.2G is a huge
amount of memory for Linux kernel.

If you do want to test the new oom-killer, you can just right a simple
program to allocate memory continues but make different instances to
eat memory in different paces. Then, you can find out who will be killed
first eventually.

/Adam
> 
> 
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