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

[Alexander Gordeev <agordeev@redhat.com>]

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@redhat.com