linux-arm.git - Russell King's ARM Linux kernel tree

Age	Commit message (Collapse)	Author
2016-11-11	blk-wbt: use BLK_STAT_{READ,WRITE} instead of 0/1	Jens Axboe
	Since we have proper enums for the stats directions, use them. Signed-off-by: Jens Axboe <axboe@fb.com>
2016-11-11	blk-wbt: remove stat ops	Jens Axboe
	Again a leftover from when the throttling code was generic. Now that we just have the block user, get rid of the stat ops and indirections. Signed-off-by: Jens Axboe <axboe@fb.com>
2016-11-11	blk-wbt: store queue instead of bdi	Jens Axboe
	The bdi was a leftover from when the code was block layer agnostic. Now that we just support a block layer user, store the queue directly. Signed-off-by: Jens Axboe <axboe@fb.com>
2016-11-10	blk-wbt: add general throttling mechanism	Jens Axboe
	We can hook this up to the block layer, to help throttle buffered writes. wbt registers a few trace points that can be used to track what is happening in the system: wbt_lat: 259:0: latency 2446318 wbt_stat: 259:0: rmean=2446318, rmin=2446318, rmax=2446318, rsamples=1, wmean=518866, wmin=15522, wmax=5330353, wsamples=57 wbt_step: 259:0: step down: step=1, window=72727272, background=8, normal=16, max=32 This shows a sync issue event (wbt_lat) that exceeded it's time. wbt_stat dumps the current read/write stats for that window, and wbt_step shows a step down event where we now scale back writes. Each trace includes the device, 259:0 in this case. Signed-off-by: Jens Axboe <axboe@fb.com>