Messages in this thread | | | Date | Tue, 14 Nov 2017 19:17:32 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 0/2] x86: Fix missing core serialization on migration |
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On Tue, Nov 14, 2017 at 07:01:55PM +0100, Daniel Bristot de Oliveira wrote: > 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: > > > >> 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.
I'm saying the IPI will not be send even without idle=poll. MWAIT based idle will also have TIF_POLLING_NRFLAG set.
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