From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: Question about usage of RCU in the input layer Date: Sat, 21 Mar 2009 11:58:46 -0700 Message-ID: <20090321185846.GB7148@linux.vnet.ibm.com> References: <20090319085628.GA6167@in.ibm.com> <20090319071841.63334eff@infradead.org> <20090320020750.GA6807@linux.vnet.ibm.com> <20090319202032.4c971d92@infradead.org> <20090320044541.GE6807@linux.vnet.ibm.com> <20090320065058.65d01771@infradead.org> <20090320143104.GA6698@linux.vnet.ibm.com> <20090320111354.679ab53d@infradead.org> <20090321012746.GM6698@linux.vnet.ibm.com> <20090320215825.19b8baae@infradead.org> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from e6.ny.us.ibm.com ([32.97.182.146]:39715 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752873AbZCUS6t (ORCPT ); Sat, 21 Mar 2009 14:58:49 -0400 Content-Disposition: inline In-Reply-To: <20090320215825.19b8baae@infradead.org> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Arjan van de Ven Cc: dipankar@in.ibm.com, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, linux-kernel@vger.kernel.org On Fri, Mar 20, 2009 at 09:58:25PM -0700, Arjan van de Ven wrote: > On Fri, 20 Mar 2009 18:27:46 -0700 > "Paul E. McKenney" wrote: > > > > I've seen only this (input) one to take a long time > > > > Ouch!!! A -single- synchronize_rcu() taking a full second??? That > > indicates breakage. > > I'll do a debug mode tomorrow and visualize it as part of the bootgraph; > hopefully it'll be an interesting result. > I'll share the graph when I have it.... Looking forward to seeing it!!! Thanx, Paul