Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755730AbaD2HsQ (ORCPT ); Tue, 29 Apr 2014 03:48:16 -0400 Received: from mail-yh0-f74.google.com ([209.85.213.74]:41336 "EHLO mail-yh0-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750848AbaD2HsP (ORCPT ); Tue, 29 Apr 2014 03:48:15 -0400 References: <1398688005-26207-1-git-send-email-mhocko@suse.cz> <10861398700008@webcorp2f.yandex-team.ru> User-agent: mu4e 0.9.9.6pre2; emacs 24.3.1 From: Greg Thelen To: Roman Gushchin Cc: Michal Hocko , Johannes Weiner , Andrew Morton , KAMEZAWA Hiroyuki , KOSAKI Motohiro , Michel Lespinasse , Tejun Heo , Hugh Dickins , LKML , "linux-mm\@kvack.org" Subject: Re: [PATCH v2 0/4] memcg: Low-limit reclaim In-reply-to: <10861398700008@webcorp2f.yandex-team.ru> Date: Tue, 29 Apr 2014 00:42:45 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 28 2014, Roman Gushchin wrote: > 28.04.2014, 16:27, "Michal Hocko" : >> The series is based on top of the current mmotm tree. Once the series >> gets accepted I will post a patch which will mark the soft limit as >> deprecated with a note that it will be eventually dropped. Let me know >> if you would prefer to have such a patch a part of the series. >> >> Thoughts? > > > Looks good to me. > > The only question is: are there any ideas how the hierarchy support > will be used in this case in practice? > Will someone set low limit for non-leaf cgroups? Why? > > Thanks, > Roman I imagine that a hosting service may want to give X MB to a top level memcg (/a) with sub-jobs (/a/b, /a/c) which may(not) have their own low-limits. Examples: case_1) only set low limit on /a. /a/b and /a/c may overcommit /a's memory (b.limit_in_bytes + c.limit_in_bytes > a.limit_in_bytes). case_2) low limits on all memcg. But not overcommitting low_limits (b.low_limit_in_in_bytes + c.low_limit_in_in_bytes <= a.low_limit_in_in_bytes). -- 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/