linux-kernel - Re: [PATCH 0/3] make mapped executable pages the first class citizen

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Date:	Sat, 20 Jun 2009 12:33:04 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Howells <dhowells@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"riel@...hat.com" <riel@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH 0/3] make mapped executable pages the first class
	citizen

On Thu, Jun 18, 2009 at 09:57:29AM -0700, Andrew Morton wrote:
> On Thu, 18 Jun 2009 17:18:58 +0100 David Howells <dhowells@...hat.com> wrote:
> 
> > 
> > Okay, after dropping all my devel patches, I got the OOM to happen again;
> > fresh trace attached.  I was running LTP and an NFSD, and I was spamming the
> > NFSD continuously from another machine (mount;tar;umount;repeat).
> > 
> >
> > ...
> >
> > Mem-Info:
> > DMA per-cpu:
> > CPU    0: hi:    0, btch:   1 usd:   0
> > CPU    1: hi:    0, btch:   1 usd:   0
> > DMA32 per-cpu:
> > CPU    0: hi:  186, btch:  31 usd:  57
> > CPU    1: hi:  186, btch:  31 usd:   0
> > Active_anon:70104 active_file:1 inactive_anon:6557
> >  inactive_file:0 unevictable:0 dirty:0 writeback:0 unstable:0
> >  free:4062 slab:41969 mapped:541 pagetables:59663 bounce:0
> 
> 77000 pages in anonymous memory, no swap online.
> 
> 42000 pages in slab.  Maybe this is a leak?
> 
> 60000 pagetable pages.  Seems rather a lot?
> 
> 179000 pages accounted for above
> 
> > DMA free:3920kB min:60kB low:72kB high:88kB active_anon:2268kB inactive_anon:428kB active_file:0kB inactive_file:0kB unevictable:0kB present:15364kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 968 968 968
> > DMA32 free:12328kB min:3948kB low:4932kB high:5920kB active_anon:278148kB inactive_anon:25800kB active_file:4kB inactive_file:0kB unevictable:0kB present:992032kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 0 0 0
> > DMA: 8*4kB 0*8kB 1*16kB 1*32kB 2*64kB 1*128kB 0*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 3920kB
> > DMA32: 2474*4kB 56*8kB 8*16kB 0*32kB 1*64kB 0*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 12328kB
> 
> present memory: 15364 + 992032 = 1007396kB.  250000 pages.  It's a 1GB
> box, yes?
> 
> > 1660 total pagecache pages
> > 0 pages in swap cache
> > Swap cache stats: add 0, delete 0, find 0/0
> > Free swap  = 0kB
> > Total swap = 0kB
> > 255744 pages RAM
> > 5588 pages reserved
> > 255749 pages shared
> > 215785 pages non-shared
> > Out of memory: kill process 6838 (msgctl11) score 152029 or a child
> > Killed process 8850 (msgctl11)
> 
> afacit, 70000 pages are unaccounted for (leaked?)

David, could you try running this when it occurred again?

        make Documentation/vm/page-types
        Documentation/vm/page-types --raw  # run as root

Thanks,
Fengguang
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