From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 665C46B0005 for ; Fri, 27 Apr 2018 04:27:18 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id m68so1043886pfm.20 for ; Fri, 27 Apr 2018 01:27:18 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id e125si846866pfe.244.2018.04.27.01.27.17 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 27 Apr 2018 01:27:17 -0700 (PDT) Date: Fri, 27 Apr 2018 10:27:15 +0200 From: Michal Hocko Subject: Re: OOM killer invoked while still one forth of mem is available Message-ID: <20180427082715.GD17484@dhcp22.suse.cz> References: <296ea83c-2c00-f1d2-3f62-d8ab8b8fb73c@c-s.fr> <20180426131154.GQ17484@dhcp22.suse.cz> <2706829f-6207-89f7-46e6-d32244305ccb@c-s.fr> <20180426190514.GU17484@dhcp22.suse.cz> <20180426222917.Horde.cu42u5sTkcbGdcY0VUmclQ1@messagerie.si.c-s.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20180426222917.Horde.cu42u5sTkcbGdcY0VUmclQ1@messagerie.si.c-s.fr> Sender: owner-linux-mm@kvack.org List-ID: To: LEROY Christophe Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, David Rientjes On Thu 26-04-18 22:29:17, LEROY Christophe wrote: > Michal Hocko a ecrit : [...] > > Yes, show_migration_types. But I do not see why unmovable pageblocks > > should block the allocation. This is a GFP_KERNEL allocation request > > essentially - thus unmovable itself. This smells like a bug. We are way > > above reserves which could block the allocation. > > Any suggestion on how to investigate that bug ? Anything to trace ? try to enable allocator and vmscan tracepoints. Maybe it will tell something. -- Michal Hocko SUSE Labs