From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755233AbYIYOFg (ORCPT ); Thu, 25 Sep 2008 10:05:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752645AbYIYOF2 (ORCPT ); Thu, 25 Sep 2008 10:05:28 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.142]:42956 "EHLO e2.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752823AbYIYOF1 (ORCPT ); Thu, 25 Sep 2008 10:05:27 -0400 Date: Thu, 25 Sep 2008 07:05:06 -0700 From: "Paul E. McKenney" To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, cl@linux-foundation.org, akpm@linux-foundation.org, manfred@colorfullife.com, dipankar@in.ibm.com, josht@linux.vnet.ibm.com, schamp@sgi.com, niv@us.ibm.com, dvhltc@us.ibm.com, ego@in.ibm.com, laijs@cn.fujitsu.com, rostedt@goodmis.org, peterz@infradead.org, penberg@cs.helsinki.fi, andi@firstfloor.org, tglx@linutronix.com Subject: Re: [PATCH, RFC] v6 scalable classic RCU implementation Message-ID: <20080925140506.GA6725@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20080821234318.GA1754@linux.vnet.ibm.com> <20080825000738.GA24339@linux.vnet.ibm.com> <20080830004935.GA28548@linux.vnet.ibm.com> <20080905152930.GA8124@linux.vnet.ibm.com> <20080915160221.GA9660@linux.vnet.ibm.com> <20080923235340.GA12166@linux.vnet.ibm.com> <20080925072607.GA20249@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080925072607.GA20249@elte.hu> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 25, 2008 at 09:26:07AM +0200, Ingo Molnar wrote: > > * Paul E. McKenney wrote: > > > +config RCU_CPU_STALL_DETECTOR > > + bool "Check for stalled CPUs delaying RCU grace periods" > > + depends on CLASSIC_RCU || TREE_RCU > > + default n > > + help > > + This option causes RCU to printk information on which > > + CPUs are delaying the current grace period, but only when > > + the grace period extends for excessive time periods. > > + > > + Say Y if you want RCU to perform such checks. > > + > > + Say N if you are unsure. > > could you please send this bit separately, even if rcutree isnt finished > yet? Seems like a quite useful debug feature. Good point -- I guess I do need to implement the CLASSIC_RCU piece of this in any case. Thanx, Paul