Jens Axboe 64f1c21e86
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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Jens Axboe
64f1c21e86