On 2021-01-08 10:32:36 [+0100], Peter Zijlstra wrote:
> It's a single task wakeup (the caller), doing that from hardirq context
> really should not be a problem, we do lots of that in RT already.
I'm not worry about that single wakeup but about an artificial case
where you manage to accumulate mul
On Thu, Jan 07, 2021 at 04:28:43PM +0100, Sebastian Siewior wrote:
> This sleep can be triggered by ptrace/strace() and with brief testing I
> can trigger the sleep there but I don't get it anywhere near where I
> would notice it with cyclictest.
It's a single task wakeup (the caller), doing that
Hi Sebastian,
On Friday, January 8, 2021 5:05 PM, Sebastian Siewior wrote:
>
> On 2021-01-08 08:45:14 [+], Ran Wang wrote:
> > Hi Sebastian, Peter
> Hi,
>
> > > I had a similar patch in -RT and dropped it in v5.10-rc7-rt16.
> > > It was added because RT couldn't boot since creating the boot-
On 2021-01-08 08:45:14 [+], Ran Wang wrote:
> Hi Sebastian, Peter
Hi,
> > I had a similar patch in -RT and dropped it in v5.10-rc7-rt16.
> > It was added because RT couldn't boot since creating the boot-threads
> > didn't work before the ksoftirqd was up. This was fixed by commit
> >26c72
Hi Sebastian, Peter
Thursday, January 7, 2021 11:29 PM, Sebastian Siewior wrote:
>
> On 2021-01-07 11:45:39 [+0100], Peter Zijlstra wrote:
> > On Thu, Jan 07, 2021 at 05:18:41PM +0800, Ran Wang wrote:
> > > +
> > > + if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
> > > +
On 2021-01-07 11:45:39 [+0100], Peter Zijlstra wrote:
> On Thu, Jan 07, 2021 at 05:18:41PM +0800, Ran Wang wrote:
> > +
> > + if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
> > + !strncmp(p->comm, "ksoftirqd/", 10))
> > + schedule_hrtimeout(&t
On Thu, Jan 07, 2021 at 05:18:41PM +0800, Ran Wang wrote:
> +
> + if (IS_ENABLED(CONFIG_PREEMPT_RT) &&
> + !strncmp(p->comm, "ksoftirqd/", 10))
> + schedule_hrtimeout(&to,
> + HRTIMER_MODE_RE
Hi,
On Thursday, January 7, 2021 5:19 PM, Ran Wang wrote:
>
> When doing CPU un-plug stress test, function smpboot_park_threads() would get
> call to park kernel threads (which including ksoftirqd) on
> that CPU core, and function wait_task_inactive() would yield for those queued
> task(s) by ca
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