From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Subject: [RFC] [PATCH] mm,
	oom: Offload OOM notify callback to a kernel thread.
Date: Sun, 1 Oct 2017 14:44:34 +0900
Message-ID: <201710011444.IBD05725.VJSFHOOMOFtLQF@I-love.SAKURA.ne.jp>
References: <201709111927.IDD00574.tFVJHLOSOOMQFF@I-love.SAKURA.ne.jp>
 <20170929065654-mutt-send-email-mst@kernel.org>
 <201709291344.FID60965.VHtMQFFJFSLOOO@I-love.SAKURA.ne.jp>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <intel-gfx-bounces@lists.freedesktop.org>
In-Reply-To: <201709291344.FID60965.VHtMQFFJFSLOOO@I-love.SAKURA.ne.jp>
List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/intel-gfx>,
 <mailto:intel-gfx-request@lists.freedesktop.org?subject=unsubscribe>
List-Archive: <https://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: <https://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: mst@redhat.com
Cc: airlied@linux.ie, jasowang@redhat.com, jiangshanlai@gmail.com, josh@joshtriplett.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, mathieu.desnoyers@efficios.com, rostedt@goodmis.org, rodrigo.vivi@intel.com, paulmck@linux.vnet.ibm.com, intel-gfx@lists.freedesktop.org
List-Id: linux-mm.kvack.org
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