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| author |   Li Hua <hucool.lihua@huawei.com> | 2021-12-03 03:36:18 +0000 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2021-12-07 15:14:10 +0100 |
| commit | 9b58e976b3b391c0cf02e038d53dd0478ed3013c (patch) | |
| tree | 0bfdd889b85130dd9c01738d4c8b05690aad5eaa /drivers | |
| parent | sched/fair: Document the slow path and fast path in select_task_rq_fair (diff) | |
| download | linux-dev-9b58e976b3b391c0cf02e038d53dd0478ed3013c.tar.xz linux-dev-9b58e976b3b391c0cf02e038d53dd0478ed3013c.zip | |
sched/rt: Try to restart rt period timer when rt runtime exceeded
When rt_runtime is modified from -1 to a valid control value, it may
cause the task to be throttled all the time. Operations like the following
will trigger the bug. E.g:
1. echo -1 > /proc/sys/kernel/sched_rt_runtime_us
2. Run a FIFO task named A that executes while(1)
3. echo 950000 > /proc/sys/kernel/sched_rt_runtime_us
When rt_runtime is -1, The rt period timer will not be activated when task
A enqueued. And then the task will be throttled after setting rt_runtime to
950,000. The task will always be throttled because the rt period timer is
not activated.
Fixes: d0b27fa77854 ("sched: rt-group: synchonised bandwidth period")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Li Hua <hucool.lihua@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211203033618.11895-1-hucool.lihua@huawei.com
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions