Messages in this thread | | | Subject | Re: [RFC PATCH 0/2] x86: Fix missing core serialization on migration | From | Daniel Bristot de Oliveira <> | Date | Tue, 14 Nov 2017 19:24:22 +0100 |
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On 11/14/2017 07:17 PM, Peter Zijlstra wrote: > 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. >
Yeah! you are right! I missed that point... sorry :-)
-- Daniel
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