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authorShaohua Li <shli@fb.com>2017-03-27 10:51:36 -0700
committerJens Axboe <axboe@fb.com>2017-03-28 08:02:20 -0600
commit06cceedcca67a93ac7f7aa93bbd9980c7496d14e (patch)
treeaf55df52adb802cb6dc7e63068165a4b8ccfc4d2 /block/blk.h
parent3f0abd806651df546f426f23490fec997dc87e5b (diff)
blk-throttle: make sure expire time isn't too big
cgroup could be throttled to a limit but when all cgroups cross high limit, queue enters a higher state and so the group should be throttled to a higher limit. It's possible the cgroup is sleeping because of throttle and other cgroups don't dispatch IO any more. In this case, nobody can trigger current downgrade/upgrade logic. To fix this issue, we could either set up a timer to wakeup the cgroup if other cgroups are idle or make sure this cgroup doesn't sleep too long. Setting up a timer means we must change the timer very frequently. This patch chooses the latter. Making cgroup sleep time not too big wouldn't change cgroup bps/iops, but could make it wakeup more frequently, which isn't a big issue because throtl_slice * 8 is already quite big. Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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