From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933749AbXCOUP0 (ORCPT ); Thu, 15 Mar 2007 16:15:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933758AbXCOUP0 (ORCPT ); Thu, 15 Mar 2007 16:15:26 -0400 Received: from smtp101.mail.mud.yahoo.com ([209.191.85.211]:45051 "HELO smtp101.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S933749AbXCOUPZ (ORCPT ); Thu, 15 Mar 2007 16:15:25 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:X-Accept-Language:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=gZPiHxJSnFmaU/d+75omIgjRp/7I9ym8yTM0rvfczZpsZTISGCzxEoPm+GK2+V5744YFqJm8B03uuG7e0BAyCRp0Hr3wxAzvhChyRWkUFxsjhPWpKx9wyoIa5AJtpNP06VfANm7pB8sF87Bwthrx51vXiQyoaxbGnZNnAANuYDg= ; X-YMail-OSG: hVNx2JAVM1lefeTpxXRQAoxlrV3AJwZnwcpO85JA.uGE1UcjPL.mXa3vlaPE069Wpc4pFKLgn3mAB.yDBR.fSM7XKVvUQ8BTiMmu9bMEJH05LA8DqSp1iTQknjJlUj8tPZzv7OKmzZJ228M- Message-ID: <45F9A954.9010400@yahoo.com.au> Date: Fri, 16 Mar 2007 07:15:16 +1100 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 X-Accept-Language: en MIME-Version: 1.0 To: Eric Dumazet CC: Ulrich Drepper , Andrew Morton , Ingo Molnar , Andi Kleen , Ravikiran G Thirumalai , "Shai Fultheim (Shai@scalex86.org)" , pravin b shelar , linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements References: <20060808070708.GA3931@localhost.localdomain> <200608090826.28249.dada1@cosmosbay.com> <200608090843.52893.dada1@cosmosbay.com> <200703152010.35614.dada1@cosmosbay.com> In-Reply-To: <200703152010.35614.dada1@cosmosbay.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Eric Dumazet wrote: > Hi > > I'm pleased to present these patches which improve linux futex performance and > scalability, on both UP, SMP and NUMA configs. > > I had this idea last year but I was not understood, probably because I gave > not enough explanations. Sorry if this mail is really long... Yes please, this is really nice. The mmap_sem is already overworked just doing real mm stuff, let alone making it the central point of our "scalable" thread synchronisation syscall. To summarise: not only will this make futexes scale much better, but it will also take some load off mmap_sem. -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com