On 11/14/2017 06:40 PM, Peter Zijlstra wrote:

On Tue, Nov 14, 2017 at 06:17:13PM +0100, Daniel Bristot de Oliveira wrote:

quoted

IIRC, if the dest cpu is idle and the system is with idle=poll, no IPI
is fired as well, but that is not a very common case.

You're thinking about wake from idle? That is almost always without IPI,
even without idle=poll.

I meant the resched_curr(rq) of an rq on another CPU. If the dest is
idle && idle=poll, the IPI will not be send.

-- Daniel