Re: [PATCH 4/6] blk-mq: Avoid that I/O hangs in bt_get()
From: Jens Axboe
Date: Tue Dec 09 2014 - 11:10:19 EST
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
I already queued up the previous one, and added the extra tag get myself.
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