Messages in this thread | | | From | Linus Torvalds <> | Date | Wed, 19 Aug 2020 15:04:56 -0700 | Subject | Re: [RFC][PATCH v2 08/10] smp,irq_work: Use the new irq_work API |
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On Wed, Aug 19, 2020 at 12:41 PM <peterz@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
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