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authorJens Axboe <axboe@fb.com>2016-11-09 22:36:15 +0300
committerJens Axboe <axboe@fb.com>2016-11-10 23:53:32 +0300
commite34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c (patch)
tree2cf40c43afdc01d953eae0098c4f8bb4d760c8d9 /block/cfq-iosched.c
parentcf43e6be865a582ba66ee4747ae27a0513f6bba1 (diff)
downloadlinux-e34cbd307477ae07c5d8a8d0bd15e65a9ddaba5c.tar.xz
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>
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