Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933512Ab2HWJcZ (ORCPT ); Thu, 23 Aug 2012 05:32:25 -0400 Received: from nctlincom02.orcon.net.nz ([60.234.4.75]:49288 "EHLO nctlincom02.orcon.net.nz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758286Ab2HWJcW (ORCPT ); Thu, 23 Aug 2012 05:32:22 -0400 Message-ID: <5035F8A2.1070702@orcon.net.nz> Date: Thu, 23 Aug 2012 21:32:18 +1200 From: Michael Cree User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20120724 Icedove/3.0.11 MIME-Version: 1.0 To: Frederic Weisbecker CC: LKML , Richard Henderson , Ivan Kokshaysky , Matt Turner , alpha , "Paul E. McKenney" , "3.2.x.." Subject: Re: [PATCH 01/10] alpha: Add missing RCU idle APIs on idle loop References: <1345652628-15060-1-git-send-email-fweisbec@gmail.com> <1345652628-15060-2-git-send-email-fweisbec@gmail.com> In-Reply-To: <1345652628-15060-2-git-send-email-fweisbec@gmail.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-DSPAM-Check: by mx6.orcon.net.nz on Thu, 23 Aug 2012 21:32:19 +1200 X-DSPAM-Result: Innocent X-DSPAM-Processed: Thu Aug 23 21:32:20 2012 X-DSPAM-Confidence: 0.5539 X-DSPAM-Probability: 0.0000 X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN, default) X-Spam-Score: 0.00 () [Hold at 5.50] X-CanIt-Geo: ip=60.234.221.162; country=NZ; region=G2; city=Porirua; latitude=-41.1333; longitude=174.8500; http://maps.google.com/maps?q=-41.1333,174.8500&z=6 X-CanItPRO-Stream: base:default X-Canit-Stats-ID: 05HO9Gr6D - 19534831fb8f - 20120823 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1190 Lines: 30 On 23/08/12 04:23, Frederic Weisbecker wrote: > In the old times, the whole idle task was considered > as an RCU quiescent state. But as RCU became more and > more successful overtime, some RCU read side critical > section have been added even in the code of some > architectures idle tasks, for tracing for example. Fantastic! It fixes RCU CPU stalls that we were seeing on the SMP kernel when built for generic Alpha. A build of glibc and running its test suite reliably triggers RCU CPU stalls when running a kernel built for generic Alpha. I have just built glibc and ran its test suite twice with no RCU CPU stalls with this patch against a 3.5.2 kernel! Nice. Very nice. I see the stable queue is CCed but I note the patch does not apply cleanly to the 3.2.y kernel. It would be nice to have a backport of the patches for the 3.2 stable kernel. So feel free to add: Tested-by: Michael Cree Cheers Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/