netdev - Re: [PATCH] virtio_net: use non-reentrant workqueue.

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Message-Id: <20111229.164458.285201500999170488.davem@davemloft.net>
Date:	Thu, 29 Dec 2011 16:44:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	rusty@...tcorp.com.au, netdev@...r.kernel.org, tj@...nel.org
Subject: Re: [PATCH] virtio_net: use non-reentrant workqueue.

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Thu, 29 Dec 2011 22:33:14 +0200

> On Thu, Dec 29, 2011 at 01:55:47PM +1030, Rusty Russell wrote:
>> Michael S. Tsirkin also noticed that we could run the refill work
>> multiple CPUs: if we kick off a refill on one CPU and then on another,
>> they would both manipulate the queue at the same time (they use
>> napi_disable to avoid racing against the receive handler itself).
>> 
>> Tejun points out that this is what the WQ_NON_REENTRANT flag is for,
>> and that there is a convenient system kthread we can use.
>> 
>> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> Acked-by: Michael S. Tsirkin <mst@...hat.com>

Applied.
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