From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752912Ab3F0Mom (ORCPT ); Thu, 27 Jun 2013 08:44:42 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:39334 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752718Ab3F0Moh (ORCPT ); Thu, 27 Jun 2013 08:44:37 -0400 Date: Thu, 27 Jun 2013 05:44:24 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, darren@dvhart.com, fweisbec@gmail.com, sbw@mit.edu Subject: Re: [PATCH RFC nohz_full 0/8] Provide infrastructure for full-system idle Message-ID: <20130627124424.GW3828@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20130625213721.GA19452@linux.vnet.ibm.com> <20130626122022.GI28407@twins.programming.kicks-ass.net> <20130626222442.GU3828@linux.vnet.ibm.com> <20130627094226.GP28407@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130627094226.GP28407@twins.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13062712-7606-0000-0000-00000CD52AE3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 27, 2013 at 11:42:26AM +0200, Peter Zijlstra wrote: > On Wed, Jun 26, 2013 at 03:24:42PM -0700, Paul E. McKenney wrote: > > Just to make sure I understand... You are saying that it is OK for > > NO_HZ_FULL to shut down timekeeping if all CPUs are idle, even if some > > of them are taking NMIs from time to time, right? > > Yeah.. its what we currently do and I don't see any reason to have > NO_HZ_FULL behave differently there. Whew!!! ;-) Thanx, Paul