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| author | Shaohua Li <shli@fb.com> | 2017-03-27 10:51:36 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-28 08:02:20 -0600 |
| commit | 06cceedcca67a93ac7f7aa93bbd9980c7496d14e (patch) | |
| tree | af55df52adb802cb6dc7e63068165a4b8ccfc4d2 /block/blk-sysfs.c | |
| parent | 3f0abd806651df546f426f23490fec997dc87e5b (diff) | |
| download | linux-0-day-06cceedcca67a93ac7f7aa93bbd9980c7496d14e.tar.gz linux-0-day-06cceedcca67a93ac7f7aa93bbd9980c7496d14e.tar.xz | |
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>
Diffstat (limited to 'block/blk-sysfs.c')
0 files changed, 0 insertions, 0 deletions