From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932912AbcGLL2R (ORCPT ); Tue, 12 Jul 2016 07:28:17 -0400 Received: from ud19.udmedia.de ([194.117.254.59]:33997 "EHLO mail.ud19.udmedia.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753321AbcGLL2P (ORCPT ); Tue, 12 Jul 2016 07:28:15 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 12 Jul 2016 13:28:12 +0200 From: Matthias Dahl To: Michal Hocko Cc: linux-raid@vger.kernel.org, linux-mm@kvack.org, dm-devel@redhat.com, linux-kernel@vger.kernel.org Subject: Re: Page Allocation Failures/OOM with dm-crypt on software RAID10 (Intel Rapid Storage) In-Reply-To: <20160712095013.GA14591@dhcp22.suse.cz> References: <02580b0a303da26b669b4a9892624b13@mail.ud19.udmedia.de> <20160712095013.GA14591@dhcp22.suse.cz> Message-ID: User-Agent: Roundcube Webmail/1.2.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Michal... On 2016-07-12 11:50, Michal Hocko wrote: > This smells like file pages are stuck in the writeback somewhere and > the > anon memory is not reclaimable because you do not have any swap device. Not having a swap device shouldn't be a problem -- and in this case, it would cause even more trouble as in disk i/o. What could cause the file pages to get stuck or stopped from being written to the disk? And more importantly, what is so unique/special about the Intel Rapid Storage that it happens (seemingly) exclusively with that and not the the normal Linux s/w raid support? Also, if the pages are not written to disk, shouldn't something error out or slow dd down? Obviously dd is capable of copying zeros a lot faster than they could ever be written to disk -- and still, it works just fine without dm-crypt in-between. It is only when dm-crypt /is/ involved, that the memory gets filled up and things get out of control. Thanks, Matthias -- Dipl.-Inf. (FH) Matthias Dahl | Software Engineer | binary-island.eu services: custom software [desktop, mobile, web], server administration