Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755079Ab0AERuU (ORCPT ); Tue, 5 Jan 2010 12:50:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754915Ab0AERuS (ORCPT ); Tue, 5 Jan 2010 12:50:18 -0500 Received: from nlpi157.sbcis.sbc.com ([207.115.36.171]:52023 "EHLO nlpi157.prodigy.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754881Ab0AERuQ (ORCPT ); Tue, 5 Jan 2010 12:50:16 -0500 Date: Tue, 5 Jan 2010 11:47:49 -0600 (CST) From: Christoph Lameter X-X-Sender: cl@router.home To: Andi Kleen cc: Linus Torvalds , KAMEZAWA Hiroyuki , Minchan Kim , Peter Zijlstra , "Paul E. McKenney" , Peter Zijlstra , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "hugh.dickins" , Nick Piggin , Ingo Molnar Subject: Re: [RFC][PATCH 6/8] mm: handle_speculative_fault() In-Reply-To: <87wrzwbh0z.fsf@basil.nowhere.org> Message-ID: References: <20100104182429.833180340@chello.nl> <20100104182813.753545361@chello.nl> <20100105092559.1de8b613.kamezawa.hiroyu@jp.fujitsu.com> <28c262361001042029w4b95f226lf54a3ed6a4291a3b@mail.gmail.com> <20100105134357.4bfb4951.kamezawa.hiroyu@jp.fujitsu.com> <20100105143046.73938ea2.kamezawa.hiroyu@jp.fujitsu.com> <20100105163939.a3f146fb.kamezawa.hiroyu@jp.fujitsu.com> <87wrzwbh0z.fsf@basil.nowhere.org> User-Agent: Alpine 2.00 (DEB 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: 660 Lines: 17 On Tue, 5 Jan 2010, Andi Kleen wrote: > > Oh well. Somebody who is bored might look at trying to make the wrapper > > code in arch/x86/lib/semaphore_32.S work on x86-64 too. It should make the > > successful rwsem cases much faster. > > Maybe, maybe not. What we saw in the past was that the cost of acquiring exclusive access to the contended cachelines containing mmap_sem and rss counters was most important. -- 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/