From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946045AbXDEHjj (ORCPT ); Thu, 5 Apr 2007 03:39:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946048AbXDEHjj (ORCPT ); Thu, 5 Apr 2007 03:39:39 -0400 Received: from mx1.redhat.com ([66.187.233.31]:56300 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946045AbXDEHji (ORCPT ); Thu, 5 Apr 2007 03:39:38 -0400 Message-ID: <4614A7B1.60808@redhat.com> Date: Thu, 05 Apr 2007 03:39:29 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 1.5.0.7 (X11/20061008) MIME-Version: 1.0 To: Rik van Riel CC: Jakub Jelinek , Ulrich Drepper , Andrew Morton , Andi Kleen , Linux Kernel , linux-mm@kvack.org, Hugh Dickins Subject: Re: missing madvise functionality References: <46128051.9000609@redhat.com> <46128CC2.9090809@redhat.com> <20070403172841.GB23689@one.firstfloor.org> <20070403125903.3e8577f4.akpm@linux-foundation.org> <4612B645.7030902@redhat.com> <20070403202937.GE355@devserv.devel.redhat.com> <4614A5CC.5080508@redhat.com> In-Reply-To: <4614A5CC.5080508@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Rik van Riel wrote: > MADV_DONTNEED, unpatched, 1000 loops > > real 0m13.672s > user 0m1.217s > sys 0m45.712s > > > MADV_DONTNEED, with patch, 1000 loops > > real 0m4.169s > user 0m2.033s > sys 0m3.224s I just noticed something fun with these numbers. Without the patch, the system (a quad core CPU) is 10% idle. With the patch, it is 66% idle - presumably I need Nick's mmap_sem patch. However, despite being 66% idle, the test still runs over 3 times as fast! -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic.