Re: [RFC PATCH v4 2/4] genirq/cpuhotplug: Dynamically isolate CPUs from managed interrupts

[Thomas Gleixner]

On Wed, Dec 04 2024 at 15:56, Costa Shulyupin wrote:
> On Sun, 1 Dec 2024 at 15:43, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> It is introduced by commit a46c27026da1 (blk-mq: don't schedule block
> kworker on isolated CPUs)
>
> I don't know what to do with the remaining drivers.

As long as that is not fixed, you obviously cannot change the semantics.

> I am exploring the possibility of improving CPU isolation from best-effort
> to guaranteed.

If all drivers are fixed then the interrupt enabled state itself becomes
irrelevant. If there is nothing which tickles them then they won't be
raised, no?

Thanks,

        tglx