From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754053Ab1JNQBT (ORCPT ); Fri, 14 Oct 2011 12:01:19 -0400 Received: from mail-bw0-f46.google.com ([209.85.214.46]:36315 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753020Ab1JNQBR (ORCPT ); Fri, 14 Oct 2011 12:01:17 -0400 Date: Fri, 14 Oct 2011 20:01:11 +0400 From: Cyrill Gorcunov To: Frederic Weisbecker Cc: Tejun Heo , Andrew Morton , Kay Sievers , linux-kernel@vger.kernel.org, lennart@poettering.net, harald@redhat.com, david@fubar.dk, greg@kroah.com, "Kirill A. Shutemov" , Oleg Nesterov , Paul Menage , "Rafael J. Wysocki" , Pavel Emelyanov Subject: Re: A =?utf-8?Q?Plumber=E2=80=99?= =?utf-8?Q?s?= Wish List for Linux Message-ID: <20111014160110.GS14464@moon> References: <1317943022.1095.25.camel@mop> <20111011161600.6145aa6b.akpm@linux-foundation.org> <20111012005935.GD14968@somewhere> <20111012174014.GE6281@google.com> <20111012181641.GZ15413@moon> <20111014153844.GP14968@somewhere> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111014153844.GP14968@somewhere> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 14, 2011 at 05:38:47PM +0200, Frederic Weisbecker wrote: ... > > Well, wouldn't it be better to pull that complexity to userspace? > After all, moving tasks from a cgroup to another is not a performance > critical operation so that probably doesn't need to be all handled by > the kernel. > > If one worries about concurrent clone/fork while moving tasks, then > freezing the cgroup and moving its tasks away from userspace could > be enough? Well, it's not that problem to make it task-by-task, still I think it's just a convenient shortcut :) Cyrill