From: Omar Sandoval <osandov@xxxxxx> This patchset generalizes the blk-stats infrastructure to allow users to register a callback to be called at a given time with the statistics of requests completed during that window. Writeback throttling and hybrid polling are converted to the new infrastructure. The new Kyber I/O scheduler uses this, as well (but it needs to be rebased on this v2). The details are in patch 4, which is the actual conversion. Patches 1-3 are preparation cleanups. Changes since v1: - Now the user can subdivide stats into arbitrary buckets. Both in-tree users just do reads vs. writes, but we can extend poll based on request size in the future - blk_stat_arm_callback() became blk_stat_activate_msecs() and blk_stat_activate_nsecs() - The poll statistics are exposed in debugfs Omar Sandoval (4): block: remove extra calls to wbt_exit() blk-stat: use READ and WRITE instead of BLK_STAT_{READ,WRITE} blk-stat: move BLK_RQ_STAT_BATCH definition to blk-stat.c blk-stat: convert to callback-based statistics reporting block/blk-core.c | 7 +- block/blk-mq-debugfs.c | 99 +++++++-------- block/blk-mq.c | 78 ++++++++---- block/blk-mq.h | 1 - block/blk-stat.c | 315 ++++++++++++++++++++++------------------------ block/blk-stat.h | 182 ++++++++++++++++++++++++--- block/blk-sysfs.c | 31 +---- block/blk-wbt.c | 61 ++++----- block/blk-wbt.h | 2 +- include/linux/blk_types.h | 3 - include/linux/blkdev.h | 10 +- 11 files changed, 454 insertions(+), 335 deletions(-) -- 2.12.0