From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by kanga.kvack.org (Postfix) with ESMTP id 0F7306B0253 for ; Fri, 21 Aug 2015 08:43:10 -0400 (EDT) Received: by pdbmi9 with SMTP id mi9so26418494pdb.3 for ; Fri, 21 Aug 2015 05:43:09 -0700 (PDT) Received: from ipmail06.adl6.internode.on.net (ipmail06.adl6.internode.on.net. [150.101.137.145]) by mx.google.com with ESMTP id t5si12760080pdi.57.2015.08.21.05.43.08 for ; Fri, 21 Aug 2015 05:43:09 -0700 (PDT) Message-ID: <55D71CD9.8000109@internode.on.net> Date: Fri, 21 Aug 2015 22:13:05 +0930 From: Arthur Marsh MIME-Version: 1.0 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> In-Reply-To: <55D71021.7030803@suse.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Vlastimil Babka , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Linus Torvalds 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org