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
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events	blk-wbt: add general throttling mechanism	2016-11-10 13:53:32 -07:00
define_trace.h
perf.h	tracing: Use outer () on __get_str() definition	2016-07-15 15:50:58 -04:00
syscall.h
trace_events.h	tracing: Use outer () on __get_str() definition	2016-07-15 15:50:58 -04:00