From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King Subject: Re: [PATCHSET] block: fix PIO cache coherency bug, take 2 Date: Mon, 5 Jun 2006 17:37:52 +0100 Message-ID: <20060605163752.GE26666@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> <1149524202.3489.30.camel@mulgrave.il.steeleye.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from caramon.arm.linux.org.uk ([212.18.232.186]:27913 "EHLO caramon.arm.linux.org.uk") by vger.kernel.org with ESMTP id S1750742AbWFEQiJ (ORCPT ); Mon, 5 Jun 2006 12:38:09 -0400 Content-Disposition: inline In-Reply-To: <1149524202.3489.30.camel@mulgrave.il.steeleye.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: James Bottomley 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 On Mon, Jun 05, 2006 at 11:16:42AM -0500, James Bottomley wrote: > 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. Ah, so you _are_ talking about something different from what I'm talking about. I'm concentrating _solely_ on the _read_ side, and all my responses so far have been concerned about that only. Anyway, I think this discussion has become meaningless since we've been talking at cross purposes for the entire thread. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core