On 01/26/2017 01:25 PM, Omar Sandoval wrote:
> On Thu, Jan 26, 2017 at 12:48:17PM -0700, Jens Axboe wrote:
>> If we have both multiple hardware queues and shared tag map between
>> devices, we need to ensure that we propagate the hardware queue
>> restart bit higher up. This is because we can get into a situation
>> where we don't have any IO pending on a hardware queue, yet we fail
>> getting a tag to start new IO. If that happens, it's not enough to
>> mark the hardware queue as needing a restart, we need to bubble
>> that up to the higher level queue as well.
>
> One minor nit below. Otherwise, makes sense.
>
> Reviewed-by: Omar Sandoval <osan...@fb.com>
>
>> Signed-off-by: Jens Axboe <ax...@fb.com>
>> ---
>> block/blk-mq-sched.c | 28 ++++++++++++++++++++++++++++
>> block/blk-mq-sched.h | 15 +++++++++------
>> block/blk-mq.c | 3 ++-
>> block/blk-mq.h | 1 +
>> include/linux/blkdev.h | 1 +
>> 5 files changed, 41 insertions(+), 7 deletions(-)
>
>> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
>> index 25564857f5f8..73bcd201a9b7 100644
>> --- a/include/linux/blkdev.h
>> +++ b/include/linux/blkdev.h
>> @@ -602,6 +602,7 @@ struct request_queue {
>> #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
>> #define QUEUE_FLAG_DAX 26 /* device supports DAX */
>> #define QUEUE_FLAG_STATS 27 /* track rq completion times */
>> +#define QUEUE_FLAG_RESTART 28
>
> All of the other queue flags have a comment, could you add one here,
> too?
Definitely, I'll add an appropriate comment.
--
Jens Axboe
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