blk-mq: make the polling code adaptive

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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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This commit is contained in:

Jens Axboe 2016-11-14 13:03:03 -07:00

parent 06426adf07

commit 64f1c21e86

3 changed files with 83 additions and 12 deletions

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67

block/blk-mq.c

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26

block/blk-sysfs.c

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2

include/linux/blkdev.h

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