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authorJens Axboe <axboe@kernel.dk>2020-02-25 16:47:30 +0100
committerJens Axboe <axboe@kernel.dk>2020-02-25 16:57:37 +0100
commit3030fd4cb783377eca0e2a3eee63724a5c66ee15 (patch)
tree6949a688812bbf7a87aaea690873598364e4eb2a /Documentation/nios2
parentio_uring: fix poll_list race for SETUP_IOPOLL|SETUP_SQPOLL (diff)
downloadlinux-3030fd4cb783377eca0e2a3eee63724a5c66ee15.tar.xz
linux-3030fd4cb783377eca0e2a3eee63724a5c66ee15.zip
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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