On Wed, Aug 19, 2020 at 12:41 PM <pet...@infradead.org> wrote:
>
> I'm not sure I get the "expensive irq_work queues" argument, I fully
> agree with you that adding the atomic op is fairly crap.
There's an atomic op on the actual runing side too, because of the
whole IRQ_WORK_PENDING thing.
So you get that double hit.
Maybe it doesn't matter. I just remember us being very careful to
avoid any unnecessary atomics in the smp_call_function area, but
admittedly I haven't worked on that code for a few years, so ..
Linus
