From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Wilson <chris@chris-wilson.co.uk>
Subject: Re: [PATCH] drm/i915: Do an initial lockless wait for
	render completion before pread/pwrite
Date: Sun, 16 Dec 2012 18:29:32 +0000
Message-ID: <453bf0$6tgthm@azsmga001.ch.intel.com>
References: <1355680315-25793-1-git-send-email-chris@chris-wilson.co.uk>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org>
Received: from mga14.intel.com (mga14.intel.com [143.182.124.37])
	by gabe.freedesktop.org (Postfix) with ESMTP id 963C0E63D1
	for <intel-gfx@lists.freedesktop.org>;
	Sun, 16 Dec 2012 10:29:46 -0800 (PST)
In-Reply-To: <1355680315-25793-1-git-send-email-chris@chris-wilson.co.uk>
List-Unsubscribe: <http://lists.freedesktop.org/mailman/options/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <http://lists.freedesktop.org/archives/intel-gfx>
List-Post: <mailto:intel-gfx@lists.freedesktop.org>
List-Help: <mailto:intel-gfx-request@lists.freedesktop.org?subject=help>
List-Subscribe: <http://lists.freedesktop.org/mailman/listinfo/intel-gfx>,
	<mailto:intel-gfx-request@lists.freedesktop.org?subject=subscribe>
Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org
To: intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

On Sun, 16 Dec 2012 17:51:55 +0000, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> Before performing the domain transition for pread/pwrite, and so a locked
> completion if still required, wait for any pending rendering locklessly.
> This should reduce contention when reading back results from the GPU, for
> example.

Meh, the pwrite side messes around with the ret=-EFAULT and so screws up
the shmem_write patch.
-Chris
> 

-- 
Chris Wilson, Intel Open Source Technology Centre