Hi, This v2 the product of more thorough review and testing (on my part) of Mikulas' original patchset. Not seeing a major performance win in general but no loss either. DM devices do see a huge boost in IOPS thanks to being able to eliminate the inefficient md->pending IO accounting that it was doing, see: https://www.redhat.com/archives/dm-devel/2018-November/msg00415.html Happy to iterate on this patchset further as needed, all review/suggestions are very much appreciated. Thanks, Mike Mike Snitzer (1): dm rq: leverage blk_mq_queue_busy() to check for outstanding IO Mikulas Patocka (5): dm: dont rewrite dm_disk(md)->part0.in_flight block: delete part_round_stats and switch to less precise counting block: switch to per-cpu in-flight counters block: return just one value from part_in_flight dm: remove the pending IO accounting block/bio.c | 28 ++++++++++++++++---- block/blk-core.c | 67 +++++------------------------------------------ block/blk-merge.c | 3 +-- block/blk-mq.c | 12 ++++----- block/blk-mq.h | 3 +-- block/genhd.c | 59 +++++++++++++++++++++++------------------ block/partition-generic.c | 10 +++---- drivers/md/dm-core.h | 2 -- drivers/md/dm-rq.c | 9 +++---- drivers/md/dm.c | 36 +++++++++++-------------- include/linux/genhd.h | 13 +++++---- 11 files changed, 98 insertions(+), 144 deletions(-) -- 2.15.0 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
