linux-kernel - [PATCH 0/3] blk-mq: Avoid effects of a weird queue depth

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Date:	Fri, 2 Aug 2013 16:04:55 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Mike Christie <michaelc@...wisc.edu>,
	Shaohua Li <shli@...ionio.com>
Subject: [PATCH 0/3] blk-mq: Avoid effects of a weird queue depth

Hi Jens,

This series aimed to avoid effects of a weird queue depth,
i.e when less than reserved_tags requested or insufficient
number of requests were allocated.

In case number of normal (not reserved) tags is requested
less than 4 (current minimal cache size limit) there are two
options to resolve: adjust cache size to the depth or deny
queue depths less than the minimal cache size. I favored the
latter, but will repost if you prefer otherwise.

Alexander Gordeev (3):
  blk-mq: Sanity check reserved tags
  blk-mq: Check queue depth is valid
  blk-mq: Do not allocate more cache entries than used

 block/blk-mq-tag.c |   31 ++++++++++++++++++-------------
 block/blk-mq-tag.h |    6 ++++++
 block/blk-mq.c     |   12 +++++++-----
 3 files changed, 31 insertions(+), 18 deletions(-)

-- 
1.7.7.6

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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