Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755525AbZALQVf (ORCPT ); Mon, 12 Jan 2009 11:21:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752942AbZALQVX (ORCPT ); Mon, 12 Jan 2009 11:21:23 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:55848 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752377AbZALQVW (ORCPT ); Mon, 12 Jan 2009 11:21:22 -0500 Date: Mon, 12 Jan 2009 08:20:34 -0800 (PST) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Peter Zijlstra cc: Ingo Molnar , "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 Subject: Re: [PATCH -v8][RFC] mutex: implement adaptive spinning In-Reply-To: Message-ID: References: <1231774622.4371.96.camel@laptop> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 975 Lines: 25 On Mon, 12 Jan 2009, Linus Torvalds wrote: > > You made it back into the locked version. Btw, even if you probably had some reason for this, one thing to note is that I think Chris' performance testing showed that the version using a lock was inferior to his local btrfs hack, while the unlocked version actually beat his hack. Maybe I misunderstood his numbers, though. But if I followed that sub-part of the test right, it really means that the locked version is pointless - it will never be able to replace peoples local hacks for this same thing, because it just doesn't give the performance people are looking for. Since the whole (and _only_) point of this thing is to perform well, that's a big deal. Linus -- 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/