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 ultimate goal is to use this infrastructure for the mq I/O scheduler. The details are in patch 4, which is the actual conversion. Patches 1-3 are preparation cleanups. A couple of minor open issues: - Since there is no single source of truth for stats anymore (it's per-callback now), I got rid of the sysfs/debugfs files. If we still want these, we could potentially expose the statistics that poll is using. - Polling used to use per-hctx stats, but now the stats are gathered to a per-request_queue cache. This might make the stats noisier, but we can improve this in the future by splitting out stats by request size or something like that. Omar Sandoval (4): block: tear out blk-stat debugfs/sysfs entries block: remove extra calls to wbt_exit() block: change stats from array type to struct type blk-stats: convert to callback-based statistics reporting block/blk-core.c | 7 +- block/blk-mq-debugfs.c | 55 --------- block/blk-mq.c | 79 ++++++++---- block/blk-mq.h | 1 - block/blk-stat.c | 300 ++++++++++++++++++++------------------------- block/blk-stat.h | 98 ++++++++++++--- block/blk-sysfs.c | 31 +---- block/blk-wbt.c | 66 +++++----- block/blk-wbt.h | 2 +- include/linux/blk_types.h | 8 +- include/linux/blkdev.h | 10 +- include/trace/events/wbt.h | 20 +-- 12 files changed, 331 insertions(+), 346 deletions(-) -- 2.12.0
