Re: [PATCH v2, RESEND] sched/rt: Try to restart rt period timer when rt runtime exceeded

[Lihua (lihua, ran)]

Fixes: d0b27fa77854 ("sched: rt-group: synchonised bandwidth period")

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Thanks for your review~~

在 2021/12/4 19:34, Peter Zijlstra 写道:
> On Fri, Dec 03, 2021 at 03:36:18AM +0000, Li Hua wrote:
> > 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.
> >
> > Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> > Signed-off-by: Li Hua <hucool.lihua@xxxxxxxxxx>
> Thanks, do you think you can reply here with a Fixes: tag so I can add
> it?
> .