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Date: Tue, 22 Aug 2017 14:55:30 +0900 From: Byungchul Park <byungchul.park@....com> To: Juri Lelli <juri.lelli@....com> Cc: Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org, joel.opensrc@...il.com, linux-kernel@...r.kernel.org, juri.lelli@...il.com, rostedt@...dmis.org, kernel-team@....com Subject: Re: [PATCH v8 1/2] sched/deadline: Add support for SD_PREFER_SIBLING on find_later_rq() On Mon, Aug 21, 2017 at 03:07:57PM +0100, Juri Lelli wrote: > > Consider a 4 core, SMT2 system: > > > > LLC [0 - 7] > > > > SMT [0,1] [2,3] [4,5] [6,7] > > > > If we do a wake-up on CPU0, we'll find CPU1, mark that as fallback, > > continue up the domain tree, exclude 0,1 from 0-7 and find CPU2. > > > > A next wakeup on CPU0 does the same and will find CPU3, fully loading > > that core, instead of considering CPU4 first. > > > > Ah, right, I see. Thanks for explaining. > > Byungchul, maybe you could add this explanation as a comment? Yes. Good idea. I will add it. Thank you, Byungchul
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