Date: Tue, 22 Aug 2017 14:55:30 +0900
From: Byungchul Park <byungchul.park@lge.com>
To: Juri Lelli <juri.lelli@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>, mingo@kernel.org,
        joel.opensrc@gmail.com, linux-kernel@vger.kernel.org,
        juri.lelli@gmail.com, rostedt@goodmis.org, kernel-team@lge.com
Subject: Re: [PATCH v8 1/2] sched/deadline: Add support for SD_PREFER_SIBLING
 on find_later_rq()
Message-ID: <20170822055530.GF20323@X58A-UD3R>
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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