Hi, This patchset include two patches, 01. block: fix inaccurate io_ticks fix the io_ticks if start a new IO and there is no inflight IO before. 02. blk-mq: break more earlier when interate hctx An optimization for blk_mq_queue_inflight and blk_mq_part_is_in_flight these two function only want to know if there is IO inflight and do not care how many inflight IOs are there. After this patch blk_mq_queue_inflight will stop interate other hctx when find a inflight IO, blk_mq_part_is_in_inflight stop interate other setbit/hctx when find a inflight IO. Changes since v4: * only get inflight in update_io_ticks when start a new IO every jiffy. Changes since v3: * add a parameter for blk_mq_queue_tag_busy_iter to break earlier when interate hctx of a queue, since blk_mq_part_is_in_inflight and blk_mq_queue_inflight do not care how many inflight IOs. Changes since v2: * use blk_mq_queue_tag_busy_iter framework instead of open-code. * update_io_ticks before update inflight for __part_start_io_acct Changes since v1: * avoid iterate all tagset, return directly if find a set bit. * fix some typo in commit message Weiping Zhang (2): block: fix inaccurate io_ticks blk-mq: break more earlier when interate hctx block/blk-core.c | 19 ++++++++++---- block/blk-mq-tag.c | 11 ++++++-- block/blk-mq-tag.h | 2 +- block/blk-mq.c | 58 +++++++++++++++++++++++++++++++++++++++--- block/blk-mq.h | 1 + block/blk.h | 1 + block/genhd.c | 13 ++++++++++ include/linux/blk-mq.h | 1 + 8 files changed, 94 insertions(+), 12 deletions(-) -- 2.18.4
