From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f200.google.com (mail-wr0-f200.google.com [209.85.128.200]) by kanga.kvack.org (Postfix) with ESMTP id EFD476B0388 for ; Thu, 16 Mar 2017 05:39:33 -0400 (EDT) Received: by mail-wr0-f200.google.com with SMTP id v66so7434035wrc.4 for ; Thu, 16 Mar 2017 02:39:33 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id k32si5926974wre.130.2017.03.16.02.39.32 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 16 Mar 2017 02:39:32 -0700 (PDT) Date: Thu, 16 Mar 2017 10:39:31 +0100 From: Michal Hocko Subject: Re: Still OOM problems with 4.9er/4.10er kernels Message-ID: <20170316093931.GH30501@dhcp22.suse.cz> References: <20170227090236.GA2789@bbox> <20170227094448.GF14029@dhcp22.suse.cz> <20170228051723.GD2702@bbox> <20170228081223.GA26792@dhcp22.suse.cz> <20170302071721.GA32632@bbox> <20170316082714.GC30501@dhcp22.suse.cz> <20170316084733.GP802@shells.gnugeneration.com> <20170316090844.GG30501@dhcp22.suse.cz> <20170316092318.GQ802@shells.gnugeneration.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170316092318.GQ802@shells.gnugeneration.com> Sender: owner-linux-mm@kvack.org List-ID: To: lkml@pengaru.com Cc: Gerhard Wiesinger , Minchan Kim , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds On Thu 16-03-17 02:23:18, lkml@pengaru.com wrote: > On Thu, Mar 16, 2017 at 10:08:44AM +0100, Michal Hocko wrote: > > On Thu 16-03-17 01:47:33, lkml@pengaru.com wrote: > > [...] > > > While on the topic of understanding allocation stalls, Philip Freeman recently > > > mailed linux-kernel with a similar report, and in his case there are plenty of > > > page cache pages. It was also a GFP_HIGHUSER_MOVABLE 0-order allocation. > > > > care to point me to the report? > > http://lkml.iu.edu/hypermail/linux/kernel/1703.1/06360.html Thanks. It is gone from my lkml mailbox. Could you CC me (and linux-mm) please? > > > > > I'm no MM expert, but it appears a bit broken for such a low-order allocation > > > to stall on the order of 10 seconds when there's plenty of reclaimable pages, > > > in addition to mostly unused and abundant swap space on SSD. > > > > yes this might indeed signal a problem. > > Well maybe I missed something obvious that a better informed eye will catch. Nothing really obvious. There is indeed a lot of anonymous memory to swap out. Almost no pages on file LRU lists (active_file:759 inactive_file:749) but 158783 total pagecache pages so we have to have a lot of pages in the swap cache. I would probably have to see more data to make a full picture. -- Michal Hocko SUSE Labs -- 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