linux-kernel - Re: [PATCH 4/6] blk-mq: Avoid that I/O hangs in bt

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Date:	Tue, 09 Dec 2014 09:10:10 -0700
From:	Jens Axboe <axboe@...nel.dk>
To:	Bart Van Assche <bvanassche@....org>
CC:	Christoph Hellwig <hch@....de>, Robert Elliott <elliott@...com>,
	Ming Lei <ming.lei@...onical.com>,
	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/6] blk-mq: Avoid that I/O hangs in bt_get()

On 12/09/2014 08:58 AM, Bart Van Assche wrote:
> Avoid that if there are fewer hardware queues than CPU threads that
> bt_get() can hang. The symptoms of the hang were as follows:
> * All tags allocated for a particular hardware queue.
> * (nr_tags) pending commands for that hardware queue.
> * No pending commands for the software queues associated with that
>    hardware queue.

I already queued up the previous one, and added the extra tag get myself.

-- 
Jens Axboe

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