Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932808Ab1DMB7Q (ORCPT ); Tue, 12 Apr 2011 21:59:16 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:63149 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S932802Ab1DMB7N (ORCPT ); Tue, 12 Apr 2011 21:59:13 -0400 Message-ID: <4DA50430.8020701@cn.fujitsu.com> Date: Wed, 13 Apr 2011 10:02:24 +0800 From: Li Zefan User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.9) Gecko/20100921 Fedora/3.1.4-1.fc14 Thunderbird/3.1.4 MIME-Version: 1.0 To: Mike Galbraith CC: LKML , Paul Menage , Colin Cross , Peter Zijlstra , Ingo Molnar Subject: Re: query: [PATCH 2/2] cgroup: Remove call to synchronize_rcu in cgroup_attach_task References: <1302170153.12304.31.camel@marge.simson.net> In-Reply-To: <1302170153.12304.31.camel@marge.simson.net> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-04-13 09:59:49, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-04-13 09:59:50, Serialize complete at 2011-04-13 09:59:50 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1026 Lines: 27 Mike Galbraith wrote: > Greetings, > > Wrt these patches: > > https://lkml.org/lkml/2010/11/24/14 [PATCH 1/2] cgroup: Set CGRP_RELEASABLE when adding to a cgroup > https://lkml.org/lkml/2010/11/24/15 [PATCH 2/2] cgroup: Remove call to synchronize_rcu in cgroup_attach_task > > I received a query regarding 2/2 because a large database company is > apparently moving tasks between cgroups frequently enough that their > database initialization time dropped from ~11 hours to ~4 hours when > they applied this patch. > > Curious why these got no traction. I thought Paul was following the this. I'll spend some time on patch review. > > Regardless of the wisdom of frequent cgroup moves, Joe User launching > light tasks via cgexec would gain quite a bit as well it seems. > -- 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/