linux-kernel - Re: oom_killer crash linux system

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Message-Id: <20101020112828.1818.A69D9226@jp.fujitsu.com>
Date:	Wed, 20 Oct 2010 11:32:38 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"Figo.zhang" <zhangtianfei@...dcoretech.com>
Cc:	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

> 
> > > page_add_file_rmap() just counts an event where mapcount goes 0->1. 
> > > Even if thousands process shares  a page,  it's just counted into file_mapped as 1.
> > > 
> > > Then, there are 480MB of mapped file caches. Do I miss something ?
> > > 
> > > Anyway, sum-of-all-lru-of-highmem is 480MB smaller than present pages.
> > > and isolated(anon/file) is 0kB.
> > > (NORMAL has similar problem)
> > 
> > hugetlb files? But it's a desktop box. Figo, what's your meminfo?
> > 
> > The GEM objects may be files not in LRU, however they should be
> > accounted into shmem.
> > 
> > Figo, would you run "page-types -r" for some clues? It can be compiled
> > from the kernel tree:
> > 
> >         cd linux
> >         make Documentation/vm
> >         sudo Documentation/vm/page-types -r
> 
> hi fengguang,
> here is the "page-types -r" result:
> 
>              flags	page-count       MB  symbolic-flags
> long-symbolic-flags
> 0x0000000000005828	     74342      290 ___U_l_____Ma_b___________________ uptodate,lru,mmap,anonymous,swapbacked
> 0x0000000000005868	    373077     1457 ___U_lA____Ma_b___________________ uptodate,lru,active,mmap,anonymous,swapbacked

1457+290=1747MB. that's ok. and this is very different result with your
previous oom log.

can you please try 1) invoke oom 2) get page-types -r again. I'm curious
that oom makes page accounting lost again. I mean, please send us oom 
log and "page-types -r" result.

thanks.




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