On 03/21/2017 11:56 AM, Omar Sandoval wrote: > 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
Added for 4.12, thanks Omar. This is a nice improvement for the writeback throttling as well, since solves the issues with the stats and throttling having separate and unsynced windows. -- Jens Axboe
