From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753528AbYI0QR1 (ORCPT ); Sat, 27 Sep 2008 12:17:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752595AbYI0QRU (ORCPT ); Sat, 27 Sep 2008 12:17:20 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:47436 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752466AbYI0QRT (ORCPT ); Sat, 27 Sep 2008 12:17:19 -0400 Date: Sat, 27 Sep 2008 18:17:12 +0200 From: Ingo Molnar To: Peter Zijlstra Cc: Nick Piggin , Eric Dumazet , Thomas Gleixner , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 0/4] futex: get_user_pages_fast() for shared futexes Message-ID: <20080927161712.GA1525@elte.hu> References: <20080926173219.885155151@twins.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080926173219.885155151@twins.programming.kicks-ass.net> 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 * Peter Zijlstra wrote: > Since get_user_pages_fast() made it in, I thought to give this another > try. Lightly tested by disabling the private futexes and running some > java proglets. hm, very interesting. Since this is an important futex usecase i started testing it in tip/core/futexes: cd33272: futex: cleanup fshared a135356: futex: use fast_gup() 39ce77b: futex: reduce mmap_sem usage 0d7a336: futex: rely on get_user_pages() for shared futexes Nick, it would be nice to get an Acked-by/Reviewed-by from you, before we think about whether it should go upstream. Ingo