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

From: Alexander Gordeev
Date: Fri Aug 02 2013 - 10:03:35 EST

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(-)


Alexander Gordeev
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