linux-kernel - Re: difficult to pinpoint exhaustion of swap between 4.2.0-rc6 and 4.2.0-rc7

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Message-ID: <55D71021.7030803@suse.cz>
Date:	Fri, 21 Aug 2015 13:48:49 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Arthur Marsh <arthur.marsh@...ernode.on.net>, linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: difficult to pinpoint exhaustion of swap between 4.2.0-rc6 and
 4.2.0-rc7

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.
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