From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Wang <jasowang@redhat.com>
Subject: Re: [PATCH net-next 0/3] vhost: accelerate metadata access through
	vmap()
Date: Mon, 24 Dec 2018 16:32:39 +0800
Message-ID: <b10c99a2-a9c3-595f-983e-2547325e64ad@redhat.com>
References: <20181213101022.12475-1-jasowang@redhat.com>
	<20181213102315-mutt-send-email-mst@kernel.org>
	<9459e227-a943-8553-732b-d7f5225a0f22@redhat.com>
	<20181214072334-mutt-send-email-mst@kernel.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Content-Transfer-Encoding: base64
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	virtualization@lists.linux-foundation.org
To: "Michael S. Tsirkin" <mst@redhat.com>
Return-path: <virtualization-bounces@lists.linux-foundation.org>
In-Reply-To: <20181214072334-mutt-send-email-mst@kernel.org>
Content-Language: en-US
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/virtualization/>
List-Post: <mailto:virtualization@lists.linux-foundation.org>
List-Help: <mailto:virtualization-request@lists.linux-foundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=subscribe>
Sender: virtualization-bounces@lists.linux-foundation.org
Errors-To: virtualization-bounces@lists.linux-foundation.org
List-Id: netdev.vger.kernel.org
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