From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:48371 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934619AbcLUOEL (ORCPT ); Wed, 21 Dec 2016 09:04:11 -0500 Date: Wed, 21 Dec 2016 09:04:14 -0500 From: Chris Mason To: Michal Hocko CC: Tetsuo Handa , , , , , Subject: Re: OOM: Better, but still there on Message-ID: <20161221140413.GA91507@clm-mbp.masoncoding.com> References: <862a1ada-17f1-9cff-c89b-46c47432e89f@I-love.SAKURA.ne.jp> <20161217210646.GA11358@boerne.fritz.box> <20161219134534.GC5164@dhcp22.suse.cz> <20161220020829.GA5449@boerne.fritz.box> <20161221073658.GC16502@dhcp22.suse.cz> <201612212000.EJJ21327.SFHOLQOtVFMOFJ@I-love.SAKURA.ne.jp> <20161221111653.GF31118@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed In-Reply-To: <20161221111653.GF31118@dhcp22.suse.cz> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, Dec 21, 2016 at 12:16:53PM +0100, Michal Hocko wrote: >On Wed 21-12-16 20:00:38, Tetsuo Handa wrote: > >One thing to note here, when we are talking about 32b kernel, things >have changed in 4.8 when we moved from the zone based to node based >reclaim (see b2e18757f2c9 ("mm, vmscan: begin reclaiming pages on a >per-node basis") and associated patches). It is possible that the >reporter is hitting some pathological path which needs fixing but it >might be also related to something else. So I am rather not trying to >blame 32b yet... It might be interesting to put tracing on releasepage and see if btrfs is pinning pages around. I can't see how 32bit kernels would be different, but maybe we're hitting a weird corner. -chris From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id DB9BB6B03A7 for ; Wed, 21 Dec 2016 09:04:07 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id 26so221142459pgy.6 for ; Wed, 21 Dec 2016 06:04:07 -0800 (PST) Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com. [67.231.153.30]) by mx.google.com with ESMTPS id j13si26751910pgn.187.2016.12.21.06.04.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 21 Dec 2016 06:04:06 -0800 (PST) Date: Wed, 21 Dec 2016 09:04:14 -0500 From: Chris Mason Subject: Re: OOM: Better, but still there on Message-ID: <20161221140413.GA91507@clm-mbp.masoncoding.com> References: <862a1ada-17f1-9cff-c89b-46c47432e89f@I-love.SAKURA.ne.jp> <20161217210646.GA11358@boerne.fritz.box> <20161219134534.GC5164@dhcp22.suse.cz> <20161220020829.GA5449@boerne.fritz.box> <20161221073658.GC16502@dhcp22.suse.cz> <201612212000.EJJ21327.SFHOLQOtVFMOFJ@I-love.SAKURA.ne.jp> <20161221111653.GF31118@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Content-Disposition: inline In-Reply-To: <20161221111653.GF31118@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Tetsuo Handa , nholland@tisys.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, dsterba@suse.cz, linux-btrfs@vger.kernel.org On Wed, Dec 21, 2016 at 12:16:53PM +0100, Michal Hocko wrote: >On Wed 21-12-16 20:00:38, Tetsuo Handa wrote: > >One thing to note here, when we are talking about 32b kernel, things >have changed in 4.8 when we moved from the zone based to node based >reclaim (see b2e18757f2c9 ("mm, vmscan: begin reclaiming pages on a >per-node basis") and associated patches). It is possible that the >reporter is hitting some pathological path which needs fixing but it >might be also related to something else. So I am rather not trying to >blame 32b yet... It might be interesting to put tracing on releasepage and see if btrfs is pinning pages around. I can't see how 32bit kernels would be different, but maybe we're hitting a weird corner. -chris -- 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