Alexey Klimov writes:
> Daniel, thank you for taking a look. I don't mind reviewing+testing
> another approach that you described.
Eh, I like yours better :)
>> Absent further discussion, Alexey, do you plan to post another version?
>
> I plan to update this patch and re-send in the next couple
On Fri, Jan 15, 2021 at 6:54 AM Daniel Jordan
wrote:
>
> Daniel Jordan writes:
> > Peter Zijlstra writes:
> >>> The nature of this bug is also described here (with different
> >>> consequences):
> >>> https://lore.kernel.org/lkml/20200211141554.24181-1-qais.you...@arm.com/
> >>
> >> Yeah, pesky
Daniel Jordan writes:
> Peter Zijlstra writes:
>>> The nature of this bug is also described here (with different consequences):
>>> https://lore.kernel.org/lkml/20200211141554.24181-1-qais.you...@arm.com/
>>
>> Yeah, pesky deadlocks.. someone was going to try again.
>
> I dug up the synchronous p
Peter Zijlstra writes:
>> The nature of this bug is also described here (with different consequences):
>> https://lore.kernel.org/lkml/20200211141554.24181-1-qais.you...@arm.com/
>
> Yeah, pesky deadlocks.. someone was going to try again.
I dug up the synchronous patch
https://lore.kernel.o
Alexey Klimov writes:
> I also in doubts if we need cpuset_wait_for_hotplug() in
> cpuhp_online_cpu_device()
> since an online uevent is sent there too.
We do need it there if we go with this fix. Your reproducer hits the
same issue when it's changed to exercise smt/control instead of
cpuN/onli
On Thu, Dec 03, 2020 at 05:14:31PM +, Alexey Klimov wrote:
> When a CPU offlined and onlined via device_offline() and device_online()
> the userspace gets uevent notification. If, after receiving uevent,
> userspace executes sched_setaffinity() on some task trying to move it
> to a recently onl
When a CPU offlined and onlined via device_offline() and device_online()
the userspace gets uevent notification. If, after receiving uevent,
userspace executes sched_setaffinity() on some task trying to move it
to a recently onlined CPU, then it will fail with -EINVAL. Userspace needs
to wait aroun
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