From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Subject: Re: [PATCH] RFC drm/i915: Slaughter the thundering
 i915_wait_request herd
Date: Fri, 27 Nov 2015 13:53:34 +0000
Message-ID: <5658605E.1060103@linux.intel.com>
References: <1446287672-30565-1-git-send-email-chris@chris-wilson.co.uk>
 <56584874.4020003@linux.intel.com>
 <20151127130112.GC31982@nuc-i3427.alporthouse.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
Received: from mga11.intel.com (mga11.intel.com [192.55.52.93])
 by gabe.freedesktop.org (Postfix) with ESMTP id 5ABA96EB58
 for <intel-gfx@lists.freedesktop.org>; Fri, 27 Nov 2015 05:53:43 -0800 (PST)
In-Reply-To: <20151127130112.GC31982@nuc-i3427.alporthouse.com>
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>
Errors-To: intel-gfx-bounces@lists.freedesktop.org
Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org
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