From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752774AbZHFKea (ORCPT ); Thu, 6 Aug 2009 06:34:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751496AbZHFKea (ORCPT ); Thu, 6 Aug 2009 06:34:30 -0400 Received: from viefep14-int.chello.at ([62.179.121.34]:20637 "EHLO viefep14-int.chello.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751685AbZHFKe3 (ORCPT ); Thu, 6 Aug 2009 06:34:29 -0400 X-SourceIP: 213.93.53.227 Subject: Re: [PATCH 6/6] Makes procs file writable to move all threads by tgid at once From: Peter Zijlstra To: Paul Menage Cc: Benjamin Blum , containers@lists.linux-foundation.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ingo Molnar In-Reply-To: <6599ad830908060328y21a008c1pc5ed5c27e0ec905d@mail.gmail.com> References: <2f86c2480908031113y525b6cbdhe418b8a0364c7760@mail.gmail.com> <20090803194555.GA10158@us.ibm.com> <6599ad830908041148h6d3f3e9bxfef9f3eedec0ab6d@mail.gmail.com> <2f86c2480908041214r1f23c1b7q9a25b04e26c92a1a@mail.gmail.com> <6599ad830908041228w67bc6f7fh57e28f244e1923b3@mail.gmail.com> <20090805102057.GT29252@hawkmoon.kerlabs.com> <6599ad830908050911t6f23f810i65fe8fe17f3ee698@mail.gmail.com> <20090805164218.GB26446@hawkmoon.kerlabs.com> <2f86c2480908051701s57120404q475edbedb58cdca1@mail.gmail.com> <20090806095854.GD26446@hawkmoon.kerlabs.com> <6599ad830908060328y21a008c1pc5ed5c27e0ec905d@mail.gmail.com> Content-Type: text/plain Date: Thu, 06 Aug 2009 12:34:13 +0200 Message-Id: <1249554853.32113.145.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.26.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2009-08-06 at 03:28 -0700, Paul Menage wrote: > OK, well if lockdep can't currently handle the "writer takes a lock on > every thread" model, I haven't read what this is about, but simply looking at that sentence makes me want to hit someone with a cluebat. Have you any idea how expensive that is?