Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753692AbZANSsm (ORCPT ); Wed, 14 Jan 2009 13:48:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754084AbZANSsQ (ORCPT ); Wed, 14 Jan 2009 13:48:16 -0500 Received: from mx3.mail.elte.hu ([157.181.1.138]:52448 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753868AbZANSsO (ORCPT ); Wed, 14 Jan 2009 13:48:14 -0500 Date: Wed, 14 Jan 2009 19:47:46 +0100 From: Ingo Molnar To: Linus Torvalds , Peter Zijlstra Cc: "Paul E. McKenney" , Gregory Haskins , Matthew Wilcox , Andi Kleen , Chris Mason , Andrew Morton , Linux Kernel Mailing List , linux-fsdevel , linux-btrfs , Thomas Gleixner , Nick Piggin , Peter Morreale , Sven Dietrich , Dmitry Adamushko , Johannes Weiner Subject: Re: [GIT PULL] adaptive spinning mutexes Message-ID: <20090114184746.GA21334@elte.hu> References: <1231774622.4371.96.camel@laptop> <1231859742.442.128.camel@twins> <1231863710.7141.3.camel@twins> <1231864854.7141.8.camel@twins> <1231867314.7141.16.camel@twins> <1231952436.14825.28.camel@laptop> <20090114183319.GA18630@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090114183319.GA18630@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1527 Lines: 39 * Ingo Molnar wrote: > Linus, > > Please pull the adaptive-mutexes-for-linus git tree from: > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git adaptive-mutexes-for-linus > > We dropped two fresh patches from v11 for the time being: the two debug > patches, they had test failures [they triggered mutex debugging false > positives]. > > So this tree is v10 (which got a lot of testing already) plus Chris's > performance patch. It passes all x86 runtime tests here. Latest performance figures, on a 2-socket 16-way Nehalem test-system, running the code above, measured via "test-mutex V 128 10" VFS creat+unlink scalability test on tmpfs and ext3: no-spin spin [tmpfs] avg ops/sec: 291038 392865 (+34.9%) [ext3] avg ops/sec: 283291 435674 (+53.7%) Those numbers impress the heck out of me, rarely do we have such kind of speedups these days, for any established functionality. We still have the /sys/debug/sched_features tunable under CONFIG_SCHED_DEBUG=y, so should this cause any performance regressions somewhere, it can be pinned down and blamed back on this change easily, without bisection and without rebooting the box. Ingo -- 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/