From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758898Ab2EUSOL (ORCPT ); Mon, 21 May 2012 14:14:11 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53281 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758208Ab2EUSOJ (ORCPT ); Mon, 21 May 2012 14:14:09 -0400 Date: Mon, 21 May 2012 20:12:44 +0200 From: Oleg Nesterov To: Rusty Russell , tj@kernel.org Cc: Tetsuo Handa , akpm@linux-foundation.org, bharrosh@panasas.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: UMH_WAIT_EXEC->UMH_WAIT_PROC deadlock Message-ID: <20120521181244.GA3668@redhat.com> References: <4F6A93F5.1070202@panasas.com> <201203241028.IGJ09825.MtOVFHFJQSLOFO@I-love.SAKURA.ne.jp> <4F6D35F0.2020808@panasas.com> <20120323200028.fadf49f8.akpm@linux-foundation.org> <20120324145308.GA10023@redhat.com> <201205191121.BIF57837.FHFOtMOLJQSOFV@I-love.SAKURA.ne.jp> <87fwau4aag.fsf@rustcorp.com.au> <20120521173453.GB31803@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120521173453.GB31803@redhat.com> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org forgot to mention... On 05/21, Oleg Nesterov wrote: > > Another issue is that Tejun dislikes the usage of system_unbound_wq. > I guess, because WQ_UNBOUND implies WQ_HIGHPRI. Btw, I do not really > understand why. And, otoh, I don't think that __call_usermodehelper() > should be bound to any CPU, this would look a bit strange to me. and please note that currently khelper_wq is WQ_UNBOUND anyway. Oleg.