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authorJens Axboe <axboe@fb.com>2016-11-14 13:03:03 -0700
committerJens Axboe <axboe@fb.com>2016-11-17 13:34:57 -0700
commit64f1c21e86f7fe63337b5c23c129de3ec506431d (patch)
treec5cfcf1875785d425b7da3f9d47388d39c9e7793 /fs/block_dev.c
parent06426adf072bca62ac31ea396ff2159a34f276c2 (diff)
blk-mq: make the polling code adaptive
The previous commit introduced the hybrid sleep/poll mode. Take that one step further, and use the completion latencies to automatically sleep for half the mean completion time. This is a good approximation. This changes the 'io_poll_delay' sysfs file a bit to expose the various options. Depending on the value, the polling code will behave differently: -1 Never enter hybrid sleep mode 0 Use half of the completion mean for the sleep delay >0 Use this specific value as the sleep delay Signed-off-by: Jens Axboe <axboe@fb.com> Tested-By: Stephen Bates <sbates@raithlin.com> Reviewed-By: Stephen Bates <sbates@raithlin.com>
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