Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261670AbTIJKHK (ORCPT ); Wed, 10 Sep 2003 06:07:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261692AbTIJKHK (ORCPT ); Wed, 10 Sep 2003 06:07:10 -0400 Received: from hal-5.inet.it ([213.92.5.24]:6126 "EHLO hal-5.inet.it") by vger.kernel.org with ESMTP id S261670AbTIJKHI (ORCPT ); Wed, 10 Sep 2003 06:07:08 -0400 Message-ID: <021201c37783$e5b87cc0$5aaf7450@wssupremo> Reply-To: "Luca Veraldi" From: "Luca Veraldi" To: "Jamie Lokier" Cc: "linux-kernel" References: <00f201c376f8$231d5e00$beae7450@wssupremo> <20030909175821.GL16080@Synopsys.COM> <001d01c37703$8edc10e0$36af7450@wssupremo> <20030910064508.GA25795@Synopsys.COM> <015601c3777c$8c63b2e0$5aaf7450@wssupremo> <1063185795.5021.4.camel@laptop.fenrus.com> <20030910095255.GA21313@mail.jlokier.co.uk> Subject: Re: Efficient IPC mechanism on Linux Date: Wed, 10 Sep 2003 12:11:23 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 471 Lines: 17 > mean 11561 cycles to: > > page fault > copy zero page > install copy > remove copy > > (= write every page from MAP_ANON region and unmap, repeatedly) > > I think that makes a clear case for avoiding page copies. Thanks. - 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/