a bug on NO_HZ_FULL_ALL

[Shaojie Sun]

No, I think it is a bug.

Because I tested the option with NO_HZ_FULL and without
NO_HZ_FULL_ALL. It had only little interruptes on CPU0 twd.
With same code, I added NO_HZ_FULL_ALL option. It had too many
interruptes on CPU0 twd.

So the sumbitter just didn't test twd interrupts, when he expanded
NO_HZ_FULL option to all cpu.

On Thu, Nov 14, 2013 at 4:09 PM, viresh kumar <viresh.kumar at linaro.org> wrote:
> On Thursday 14 November 2013 01:35 PM, Vincent Guittot wrote:
>> AFAICT, It's a none issue. In full nohz, a timer fires periodically
>> (around 4sec period on ARM IIRC) on one cpu (cpu0).
>
> Timer should always be running on CPU0, its out of nohz-full domain. Its
> cpu 1, where it will fire after long delays..
>
>
> https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/AdaptiveTickless