Re: [PATCH] blk-mq-sched: separate mark hctx and queue restart operations

[Omar Sandoval <osandov@osandov.com>]

On Fri, Feb 03, 2017 at 11:35:58AM -0800, Omar Sandoval wrote:
> From: Omar Sandoval <osandov@fb.com>
> 
> In blk_mq_sched_dispatch_requests(), we call blk_mq_sched_mark_restart()
> after we dispatch requests left over on our hardware queue dispatch
> list. This is so we'll go back and dispatch requests from the scheduler.
> In this case, it's only necessary to restart the hardware queue that we
> are running; there's no reason to run other hardware queues just because
> we are using shared tags.
> 
> So, split out blk_mq_sched_mark_restart() into two operations: the "all"
> variant is for when we really need to mark the request queue as needing
> a restart, and we'll keep the original for just the hardware queue.
> 
> Signed-off-by: Omar Sandoval <osandov@fb.com>
> ---
> Based on block/for-next. There might be a better name for this.
> 
>  block/blk-mq-sched.h | 15 +++++++++++++++
>  block/blk-mq.c       |  2 +-
>  2 files changed, 16 insertions(+), 1 deletion(-)

Actually, I think I want to do this slightly differently, ignore this
for now.