tree d09924891e887e970be9a18442bebc40d2ad64ee
parent 0eadf37afc2500e1162c9040ec26a705b9af8d47
author Stephen Bates <sbates@raithlin.com> 1473790995 -0600
committer Jens Axboe <axboe@fb.com> 1473864081 -0600

block: add poll_considered statistic

In order to help determine the effectiveness of polling in a running
system it is usful to determine the ratio of how often the poll
function is called vs how often the completion is checked. For this
reason we add a poll_considered variable and add it to the sysfs entry
for io_poll.

Signed-off-by: Stephen Bates <sbates@raithlin.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>