From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752227AbaCVWEt (ORCPT ); Sat, 22 Mar 2014 18:04:49 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:50266 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751506AbaCVWEr (ORCPT ); Sat, 22 Mar 2014 18:04:47 -0400 Date: Sat, 22 Mar 2014 23:04:44 +0100 From: Frederic Weisbecker To: Tejun Heo Cc: Kevin Hilman , LKML , Christoph Lameter , Mike Galbraith , "Paul E. McKenney" , Viresh Kumar Subject: Re: [PATCH 3/3] workqueue: Add anon workqueue sysfs hierarchy Message-ID: <20140322220442.GB20038@localhost.localdomain> References: <1394815131-17271-1-git-send-email-fweisbec@gmail.com> <1394815131-17271-4-git-send-email-fweisbec@gmail.com> <7ha9csionc.fsf@paris.lan> <20140322170114.GA20038@localhost.localdomain> <20140322185551.GA24945@htj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140322185551.GA24945@htj.dyndns.org> 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 Sat, Mar 22, 2014 at 02:55:51PM -0400, Tejun Heo wrote: > On Sat, Mar 22, 2014 at 06:01:18PM +0100, Frederic Weisbecker wrote: > > 1) Call a per workqueue mutex when a work execute on an ordered workqueue. Although > > contention should be very rare (only while we replace the workqueue attrs and > > switch to a new worker), frequent locking may have a visible impact. > > > > 2) Have a seperate worker for all ordered workqueues. But we may lose a bit of > > serialization with other workqueues along the way. > > Ordered workqueues are always bound to the fallback default worker > pool. Why not just adjust cpus_allowed of the worker pool? Now that you tell me, that sounds obvious enough. I'll try something. Thanks. > > Thanks. > > -- > tejun