From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 30 Oct 2000 13:18:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 30 Oct 2000 13:18:05 -0500 Received: from ns.caldera.de ([212.34.180.1]:40453 "EHLO ns.caldera.de") by vger.kernel.org with ESMTP id ; Mon, 30 Oct 2000 13:17:54 -0500 Date: Mon, 30 Oct 2000 19:17:12 +0100 From: Christoph Hellwig To: Jeff Garzik Cc: Linus Torvalds , linux-kernel@vger.kernel.org, sct@redhat.com Subject: Re: [PATCH] kiobuf/rawio fixes for 2.4.0-test10-pre6 Message-ID: <20001030191712.B27664@caldera.de> Mail-Followup-To: Jeff Garzik , Linus Torvalds , linux-kernel@vger.kernel.org, sct@redhat.com In-Reply-To: <20001027222143.A8059@caldera.de> <200010272123.OAA21478@penguin.transmeta.com> <20001030124513.A28667@caldera.de> <39FDAD99.47FA6A54@mandrakesoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <39FDAD99.47FA6A54@mandrakesoft.com>; from jgarzik@mandrakesoft.com on Mon, Oct 30, 2000 at 12:19:21PM -0500 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 30, 2000 at 12:19:21PM -0500, Jeff Garzik wrote: > Christoph Hellwig wrote: > > +Locking down user memory and doing mass storage device IO with it is not > > +the only purpose of kiobufs. Another use for kiobufs is allowing > > +user-space mmaping dma memory, e.g in sound drivers. To do so you > > +need to lock-down kernel virtual memory and refernece it using kiobufs. > > +The code that does exactly this is not yet in the kernel - get Stephen > > +Tweedie's kiobuf patchset if you want to use this. > > Take a look at drivers/sound/via82cxxx_audio.c. How can that mmap be > improved by using kiobufs? I think so - but you need Stephen's kvmap patch, that is in the same patchset the forward-ported fixes are (at ftp://ftp.linux.org.uk/pub/linux/sct/fs/raw-io/) An very nice example is included. Christoph -- Always remember that you are unique. Just like everyone else. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/