Message-ID: <55D71CD9.8000109@internode.on.net>
Date: Fri, 21 Aug 2015 22:13:05 +0930
From: Arthur Marsh <arthur.marsh@internode.on.net>
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To: Vlastimil Babka <vbabka@suse.cz>, linux-mm@kvack.org
CC: linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: difficult to pinpoint exhaustion of swap between 4.2.0-rc6 and
 4.2.0-rc7
References: <55D4A462.3070505@internode.on.net> <55D58CEB.9070701@suse.cz> <55D6ECBD.60303@internode.on.net> <55D70D80.5060009@suse.cz> <55D71021.7030803@suse.cz>
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Vlastimil Babka wrote on 21/08/15 21:18:
> On 08/21/2015 01:37 PM, Vlastimil Babka wrote:
>>
>> That, said, looking at the memory values:
>>
>> rc6: Free+Buffers+A/I(Anon)+A/I(File)+Slab = 6769MB
>> rc7: ...                                   = 4714MB
>>
>> That's 2GB unaccounted for.
>
> So one brute-force way to see who allocated those 2GB is to use the
> page_owner debug feature. You need to enable CONFIG_PAGE_OWNER and then
> follow the Usage part of Documentation/vm/page_owner.txt
> If you can do that, please send the sorted_page_owner.txt for rc7 when
> it's semi-nearing the exhausted swap. Then you could start doing a
> comparison run with rc6, but maybe it will be easy to figure from the
> rc7 log already. Thanks.
>

I'm currently rebuilding the rc7 kernel with CONFIG_PAGE_OWNER=y and 
will test that.

Arthur.
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