From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265211AbUHNEpd (ORCPT ); Sat, 14 Aug 2004 00:45:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265910AbUHNEpd (ORCPT ); Sat, 14 Aug 2004 00:45:33 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:48532 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S265211AbUHNEpb (ORCPT ); Sat, 14 Aug 2004 00:45:31 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8-rc4-O7 From: Lee Revell To: Ingo Molnar Cc: linux-kernel , Felipe Alfaro Solana , Florian Schmidt In-Reply-To: <20040813104817.GI8135@elte.hu> References: <20040726083537.GA24948@elte.hu> <1090832436.6936.105.camel@mindpipe> <20040726124059.GA14005@elte.hu> <20040726204720.GA26561@elte.hu> <20040729222657.GA10449@elte.hu> <20040801193043.GA20277@elte.hu> <20040809104649.GA13299@elte.hu> <20040810132654.GA28915@elte.hu> <20040812235116.GA27838@elte.hu> <1092382825.3450.19.camel@mindpipe> <20040813104817.GI8135@elte.hu> Content-Type: text/plain Message-Id: <1092458772.803.64.camel@krustophenia.net> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Sat, 14 Aug 2004 00:46:12 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2004-08-13 at 06:48, Ingo Molnar wrote: > ok, it seems the lock-break of the outer loop was not enough - the up to > 1024 iterations in the inner loop can generate quite high latencies too. > In some of the traces, like this one: http://krustophenia.net/testresults.php?dataset=2.6.8-rc4-bk3-O7#/var/www/2.6.8-rc4-bk3-O7/mount_reiserfs_latency_trace.txt there are calls to voluntary_resched. How is this possible? Does it mean that we called voluntary_resched while holding a spinlock, where we needed to call voluntary_preempt_lock(&foo_lock), and thus failed to reschedule? Lee