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54 Commits

Author SHA1 Message Date
Jens Axboe 382cf633ed blk-wbt: use BLK_STAT_{READ,WRITE} instead of 0/1 
Since we have proper enums for the stats directions, use them.

Signed-off-by: Jens Axboe <axboe@fb.com>
 2016-11-11 16:18:29 -07:00
Jens Axboe 8054b89f8f blk-wbt: remove stat ops 
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 16:18:24 -07:00
Jens Axboe d8a0cbfd73 blk-wbt: store queue instead of bdi 
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>
 2016-11-11 16:18:18 -07:00
Jens Axboe e34cbd3074 blk-wbt: add general throttling mechanism 
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>
 2016-11-10 13:53:32 -07:00