From: Omar Sandoval <[email protected]>
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
