On Sat, 2 Dec 2017 13:53:31 +0100 Sebastian Andrzej Siewior <[email protected]> wrote:
> what about a check next to sched_feat(RT_PUSH_IPI)? I don't know if this > is a hot path or not (due to bitmap_weight). If it is, then I would > suggest something like a jump-label which is enabled if more than one > CPU has been enabled on boot. Yeah I didn't like that because of the overhead. But I was being optimistic that the cpu weight function would be a nit to the actual pull logic. But I have a better plan. I would like to disable RT_PUSH_IPI, but that's a sched feature and that is a constant if we build without sched debugging. v2 coming up. -- Steve
