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authorJens Axboe <axboe@kernel.dk>2020-02-25 08:47:30 -0700
committerJens Axboe <axboe@kernel.dk>2020-02-25 08:57:37 -0700
commit3030fd4cb783377eca0e2a3eee63724a5c66ee15 (patch)
tree6949a688812bbf7a87aaea690873598364e4eb2a /fs/io-wq.h
parentbdcd3eab2a9ae0ac93f27275b6895dd95e5bf360 (diff)
downloadlinux-sh-3030fd4cb783377eca0e2a3eee63724a5c66ee15.tar.gz
io-wq: remove spin-for-work optimization
Andres reports that buffered IO seems to suck up more cycles than we would like, and he narrowed it down to the fact that the io-wq workers will briefly spin for more work on completion of a work item. This was a win on the networking side, but apparently some other cases take a hit because of it. Remove the optimization to avoid burning more CPU than we have to for disk IO. Reported-by: Andres Freund <andres@anarazel.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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