Odin Ugedal 72d0ad7cb5 sched/fair: Fix CFS bandwidth hrtimer expiry type
The time remaining until expiry of the refresh_timer can be negative.
Casting the type to an unsigned 64-bit value will cause integer
underflow, making the runtime_refresh_within return false instead of
true. These situations are rare, but they do happen.

This does not cause user-facing issues or errors; other than
possibly unthrottling cfs_rq's using runtime from the previous period(s),
making the CFS bandwidth enforcement less strict in those (special)
situations.

Signed-off-by: Odin Ugedal <odin@uged.al>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ben Segall <bsegall@google.com>
Link: https://lore.kernel.org/r/20210629121452.18429-1-odin@uged.al
2021-07-02 15:58:24 +02:00
..
2021-03-22 00:11:52 +01:00
2021-05-12 11:43:26 +02:00
2021-03-22 00:11:52 +01:00
2020-10-29 11:00:30 +01:00
2021-05-12 11:43:30 +02:00
2021-03-22 00:11:52 +01:00
2021-03-22 00:11:52 +01:00
2021-06-18 11:43:07 +02:00