Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031015AbXEDQFL (ORCPT ); Fri, 4 May 2007 12:05:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1031020AbXEDQFL (ORCPT ); Fri, 4 May 2007 12:05:11 -0400 Received: from mx1.redhat.com ([66.187.233.31]:33531 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031015AbXEDQFI (ORCPT ); Fri, 4 May 2007 12:05:08 -0400 Message-ID: <463B598B.80200@redhat.com> Date: Fri, 04 May 2007 09:04:27 -0700 From: Ulrich Drepper Organization: Red Hat, Inc. User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Nick Piggin CC: Rik van Riel , Linus Torvalds , linux-kernel , linux-mm , Andrew Morton , Jakub Jelinek Subject: Re: [PATCH] MM: implement MADV_FREE lazy freeing of anonymous memory References: <4632D0EF.9050701@redhat.com> <463B108C.10602@yahoo.com.au> In-Reply-To: <463B108C.10602@yahoo.com.au> X-Enigmail-Version: 0.94.3.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigB9E51AA9AB8A92368961C143" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1794 Lines: 45 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB9E51AA9AB8A92368961C143 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Nick Piggin wrote: > What I found is that, on this system, MADV_FREE performance improvement= > was in the noise when you look at it on top of the MADV_DONTNEED glibc > and down_read(mmap_sem) patch in sysbench. I don't want to judge the numbers since I cannot but I want to make an observations: even if in the SMP case MADV_FREE turns out to not be a bigger boost then there is still the UP case to keep in mind where Rik measured a significant speed-up. As long as the SMP case isn't hurt this is reaosn enough to use the patch. With more and more cores on one processor SMP systems are pushed evermore to the high-end side. You'll find many installations which today use SMP will be happy enough with many-core UP machines. --=20 =E2=9E=A7 Ulrich Drepper =E2=9E=A7 Red Hat, Inc. =E2=9E=A7 444 Castro St = =E2=9E=A7 Mountain View, CA =E2=9D=96 --------------enigB9E51AA9AB8A92368961C143 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFGO1mL2ijCOnn/RHQRAjv8AJ9zZVuzkgK54Pt7kJYSkZWfHVnvrwCgkyVV hldTUN/cq7b2y8tPOqgb0ZU= =woM3 -----END PGP SIGNATURE----- --------------enigB9E51AA9AB8A92368961C143-- - 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/