Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755289AbYKKAUc (ORCPT ); Mon, 10 Nov 2008 19:20:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754910AbYKKAUM (ORCPT ); Mon, 10 Nov 2008 19:20:12 -0500 Received: from smtprelay05.ispgateway.de ([80.67.18.43]:46973 "EHLO smtprelay05.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754702AbYKKAUK (ORCPT ); Mon, 10 Nov 2008 19:20:10 -0500 From: Ingo Oeser To: Peter Zijlstra Subject: Re: regression introduced by - timers: fix itimer/many thread hang Date: Tue, 11 Nov 2008 01:20:03 +0100 User-Agent: KMail/1.10.3 (Linux/2.6.27-7-generic; KDE/4.1.3; x86_64; ; ) Cc: Christoph Lameter , Frank Mayhar , Doug Chapman , mingo@elte.hu, roland@redhat.com, adobriyan@gmail.com, akpm@linux-foundation.org, "linux-kernel" References: <1224694989.8431.23.camel@oberon> <1226328152.7685.192.camel@twins> In-Reply-To: <1226328152.7685.192.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200811110120.04768.ioe-lkml@rameria.de> X-Df-Sender: 849595 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 643 Lines: 18 On Monday 10 November 2008, Peter Zijlstra wrote: > The detail I've not looked at is, if when this itimer is indeed active > and we are running 256 threads of the same application on all cpus do we > then do the per-cpu loop for each tick on each cpu? Can't this kind of aggregation not be done in a tree-like manner? I mean these CPUs are not on the same node, right? Best Regards Ingo Oeser -- 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/