On 03/23/2018 02:27 PM, Thomas Gleixner wrote:
>
> Looking at all call sites. None of them is performance critical and all of
> them are in preemptible context.
>
> So we simply can switch the rdmsr_safe_on_cpu() implementation over to wait
> mode completely.
SGTM, thanks for looking, I will se
On Mon, 19 Mar 2018, Eric Dumazet wrote:
> I noticed high latencies caused by a daemon periodically reading
> various MSR on all cpus. KASAN kernels would see ~10ms latencies
> simply reading one MSR. Even without KASAN, sending IPI to CPU
> in deep sleep state or blocking hard IRQ in a a long sec
I noticed high latencies caused by a daemon periodically reading
various MSR on all cpus. KASAN kernels would see ~10ms latencies
simply reading one MSR. Even without KASAN, sending IPI to CPU
in deep sleep state or blocking hard IRQ in a a long section,
then waiting for the answer can consume hund
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