From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751220AbWFEQTl (ORCPT ); Mon, 5 Jun 2006 12:19:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751221AbWFEQTl (ORCPT ); Mon, 5 Jun 2006 12:19:41 -0400 Received: from stat9.steeleye.com ([209.192.50.41]:50859 "EHLO hancock.sc.steeleye.com") by vger.kernel.org with ESMTP id S1751220AbWFEQTj (ORCPT ); Mon, 5 Jun 2006 12:19:39 -0400 Subject: Re: [PATCHSET] block: fix PIO cache coherency bug, take 2 From: James Bottomley To: Russell King Cc: Tejun Heo , Jens Axboe , Dave Miller , bzolnier@gmail.com, jgarzik@pobox.com, mattjreimer@gmail.com, Guennadi Liakhovetski , lkml , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org In-Reply-To: <20060605154837.GD26666@flint.arm.linux.org.uk> References: <1149392479501-git-send-email-htejun@gmail.com> <20060604204444.GF4484@flint.arm.linux.org.uk> <20060604222347.GG4484@flint.arm.linux.org.uk> <1149517656.3489.15.camel@mulgrave.il.steeleye.com> <20060605144456.GA26666@flint.arm.linux.org.uk> <1149521085.3489.24.camel@mulgrave.il.steeleye.com> <20060605153420.GB26666@flint.arm.linux.org.uk> <1149522460.3489.26.camel@mulgrave.il.steeleye.com> <20060605154837.GD26666@flint.arm.linux.org.uk> Content-Type: text/plain Date: Mon, 05 Jun 2006 11:16:42 -0500 Message-Id: <1149524202.3489.30.camel@mulgrave.il.steeleye.com> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 (2.2.3-4.fc4) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2006-06-05 at 16:48 +0100, Russell King wrote: > When does the zero copy case occur? Almost all user initiated I/O. Glibc tends to implement this as mmap internally. James