From: Stephen Bates <sbates@xxxxxxxxxxxx> Omar recently developed some patches for block layer stats that use callbacks to determine which bucket an IO should be considered for. At the same time there was discussion at LSF/MM that we might not want to consider all IO when generating stats for certain algorithms (e.g. IO completion polling). This set does two things. It makes the bucket callback for stats signed so we can now ignore IO that cause a negative to be returned from the bucket function. It then uses this new functionality to filter IO for the IO completion polling algorithms. This patchset applies cleanly on a83b576c9c25cf (block: fix stacked driver stats init and free) in Jens' for-next tree. I've lightly tested this using QEMU and a real NVMe low-latency device. I do not have performance number yet. Feedback would be appreciated! [BTW this is my first submission for an all new setup so apologies if this does not come through correctly!] Cc: Damien.LeMoal@xxxxxxx Cc: osandov@xxxxxxxxxxx Stephen Bates (2): blk-stat: convert blk-stat bucket callback to signed blk-stat: add a poll_size value to the request_queue struct block/blk-mq.c | 17 +++++++++++++++-- block/blk-stat.c | 8 +++++--- block/blk-stat.h | 9 +++++---- block/blk-sysfs.c | 30 ++++++++++++++++++++++++++++++ include/linux/blkdev.h | 1 + 5 files changed, 56 insertions(+), 9 deletions(-) -- 2.7.4
