Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751567Ab2HOPPD (ORCPT ); Wed, 15 Aug 2012 11:15:03 -0400 Received: from mx2.parallels.com ([64.131.90.16]:56068 "EHLO mx2.parallels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750781Ab2HOPPB (ORCPT ); Wed, 15 Aug 2012 11:15:01 -0400 Message-ID: <502BBC35.809@parallels.com> Date: Wed, 15 Aug 2012 19:11:49 +0400 From: Glauber Costa User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 MIME-Version: 1.0 To: Christoph Lameter CC: Michal Hocko , , , , , "Johannes Weiner" , Andrew Morton , , David Rientjes , "Pekka Enberg" Subject: Re: [PATCH v2 04/11] kmem accounting basic infrastructure References: <1344517279-30646-1-git-send-email-glommer@parallels.com> <1344517279-30646-5-git-send-email-glommer@parallels.com> <20120814162144.GC6905@dhcp22.suse.cz> <502B6D03.1080804@parallels.com> <20120815123931.GF23985@dhcp22.suse.cz> <000001392ac15404-43a3fd2c-a6d3-4985-b173-74bb586ad47c-000000@email.amazonses.com> In-Reply-To: <000001392ac15404-43a3fd2c-a6d3-4985-b173-74bb586ad47c-000000@email.amazonses.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [109.173.1.99] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1161 Lines: 26 On 08/15/2012 06:47 PM, Christoph Lameter wrote: > On Wed, 15 Aug 2012, Michal Hocko wrote: > >>> That is not what the kernel does, in general. We assume that if he wants >>> that memory and we can serve it, we should. Also, not all kernel memory >>> is unreclaimable. We can shrink the slabs, for instance. Ying Han >>> claims she has patches for that already... >> >> Are those patches somewhere around? > > You can already shrink the reclaimable slabs (dentries / inodes) via > calls to the subsystem specific shrinkers. Did Ying Han do anything to > go beyond that? > That is not enough for us. We would like to make sure that the objects being discarded belong to the memcg which is under pressure. We don't need to be perfect here, and an occasional slip is totally fine. But if in general, shrinking from memcg A will mostly wipe out objects from memcg B, we harmed the system in return for nothing good. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/