linux-kernel - Re: [Regression x2, 3.13-git] virtio block mq hang, iostat busted on virtio devices

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Message-ID: <20131119160949.GA24191@infradead.org>
Date:	Tue, 19 Nov 2013 08:09:49 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org
Subject: Re: [Regression x2, 3.13-git] virtio block mq hang, iostat busted on
 virtio devices

On Tue, Nov 19, 2013 at 09:05:09AM -0700, Jens Axboe wrote:
> I have queued up the below.

I don't think that will work.  We only set QUEUE_FLAG_IO_STAT in
blk_init_allocated_queue, which doesn't get called from
blk_mq_init_queue.  That being said I really don't understand why we
need to have the QUEUE_FLAG_IO_STAT flag at all.

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