From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754743AbbB0LyI (ORCPT ); Fri, 27 Feb 2015 06:54:08 -0500 Received: from mail-qg0-f54.google.com ([209.85.192.54]:43215 "EHLO mail-qg0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752905AbbB0LyF (ORCPT ); Fri, 27 Feb 2015 06:54:05 -0500 Date: Fri, 27 Feb 2015 06:54:01 -0500 From: Tejun Heo To: Gu Zheng Cc: linux-kernel@vger.kernel.org, laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, kamezawa.hiroyu@jp.fujitsu.com, tangchen@cn.fujitsu.com Subject: Re: [PATCH] workqueue: update numa affinity when node hotplug Message-ID: <20150227115401.GD3964@htj.duckdns.org> References: <1425031492-32300-1-git-send-email-guz.fnst@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1425031492-32300-1-git-send-email-guz.fnst@cn.fujitsu.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Fri, Feb 27, 2015 at 06:04:52PM +0800, Gu Zheng wrote: > Yasuaki Ishimatsu found that with node online/offline, cpu<->node > relationship is established. Because workqueue uses a info which was > established at boot time, but it may be changed by node hotpluging. I've asked this a couple times now but can somebody please justify why cpu<->node relationship needs to change? If it has to change, that's okay but let's please first make sure that we understand why such thing is necessary so that we can figure out what kind of facilities are necessary for such dynamism. Thanks. -- tejun