linux-kernel - Re: [PATCH v2 2/6] sched/rt: Optimize select_task_rq

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Message-ID: <20141104094707.79e9ca86@gandalf.local.home>
Date:	Tue, 4 Nov 2014 09:47:07 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"pang.xunlei" <pang.xunlei@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...il.com>
Subject: Re: [PATCH v2 2/6] sched/rt: Optimize select_task_rq_rt() for
 non-RT curr task

On Tue, 4 Nov 2014 22:29:24 +0800
"pang.xunlei" <pang.xunlei@...aro.org> wrote:


> > Migration is not cheap. It causes cache misses and TLB flushes. This is
> > not something that should be taken lightly.
> Ok, thanks!
> But I think the PUSH operation optimized by the former patch is reasonable,
> since PUSH itselft does involve the Migration. Do I miss something?

For the first patch you may be right, but I want to think about it some
more. I want to make sure we are not adding any other type of overhead
with the extra calls.

-- Steve
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