[PATCH 0/4] blk-mq: support to use hw tag for scheduling

Ming Lei
2017-04-28T15:16:18Z

Hi,

This patchset introduces flag of BLK_MQ_F_SCHED_USE_HW_TAG and
allows to use hardware tag directly for IO scheduling if the queue's
depth is big enough. In this way, we can avoid to allocate extra tags
and request pool for IO schedule, and the schedule tag allocation/release
can be saved in I/O submit path.

Thanks,
Ming

Ming Lei (4):
blk-mq: introduce BLK_MQ_F_SCHED_USE_HW_TAG
blk-mq: introduce blk_mq_get_queue_depth()
blk-mq: use hw tag for scheduling if hw tag space is big enough
blk-mq: dump new introduced flag of BLK_MQ_F_SCHED_USE_HW_TAG

block/blk-mq-debugfs.c | 1 +
block/blk-mq-sched.c | 18 +++++++++++++-
block/blk-mq-sched.h | 15 ++++++++++++
block/blk-mq.c | 65 ++++++++++++++++++++++++++++++++++++++++++++------
block/blk-mq.h | 1 +
include/linux/blk-mq.h | 1 +
6 files changed, 93 insertions(+), 8 deletions(-)

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2.9.3