From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1 with cipher ADH-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 40XRr93Hg5zF24D for ; Fri, 27 Apr 2018 18:27:20 +1000 (AEST) Date: Fri, 27 Apr 2018 10:27:15 +0200 From: Michal Hocko To: LEROY Christophe Cc: linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, David Rientjes 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 In-Reply-To: <20180426222917.Horde.cu42u5sTkcbGdcY0VUmclQ1@messagerie.si.c-s.fr> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu 26-04-18 22:29:17, LEROY Christophe wrote: > Michal Hocko a écrit : [...] > > 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