streamline blk-mq I/O scheduler interaction

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To: Jens Axboe <axboe@xxxxxxxxx>, Omar Sandoval <osandov@xxxxxx>, Paolo Valente <paolo.valente@xxxxxxxxxx>
Subject: streamline blk-mq I/O scheduler interaction
From: Christoph Hellwig <hch@xxxxxx>
Date: Fri, 16 Jun 2017 18:15:17 +0200
Cc: linux-block@xxxxxxxxxxxxxxx

Hi blk-mq І/O scheduler folks,

I've been trying to re-learn our I/O path after the scheduler additions,
and when walking through the code the following optimization came to
my mind.  I've only done basic testing with them, so for now this is
a bit of a RFC.

Follow-Ups:
- Re: streamline blk-mq I/O scheduler interaction
  - From: Jens Axboe
- Re: streamline blk-mq I/O scheduler interaction
  - From: Jens Axboe
- [PATCH 09/10] blk-mq-sched: unify request prepare methods
  - From: Christoph Hellwig
- [PATCH 10/10] blk-mq: remove __blk_mq_alloc_request
  - From: Christoph Hellwig
- [PATCH 08/10] blk-mq: refactor blk_mq_sched_assign_ioc
  - From: Christoph Hellwig
- [PATCH 07/10] bfq-iosched: fix NULL ioc check in bfq_get_rq_private
  - From: Christoph Hellwig
- [PATCH 06/10] blk-mq: streamline blk_mq_get_request
  - From: Christoph Hellwig
- [PATCH 05/10] blk-mq: simplify blk_mq_free_request
  - From: Christoph Hellwig
- [PATCH 04/10] blk-mq-sched: unify request finished methods
  - From: Christoph Hellwig
- [PATCH 02/10] blk-mq: move blk_mq_sched_{get,put}_request to blk-mq.c
  - From: Christoph Hellwig
- [PATCH 03/10] blk-mq: remove blk_mq_sched_{get,put}_rq_priv
  - From: Christoph Hellwig
- [PATCH 01/10] blk-mq: mark blk_mq_rq_ctx_init static
  - From: Christoph Hellwig

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