linux-kernel - Re: [PATCH] sched/cpufreq: don't trigger cpufreq update w/o real rt/deadline tasks running

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Message-ID: <20160420140117.GZ3448@twins.programming.kicks-ass.net>
Date:	Wed, 20 Apr 2016 16:01:17 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Wanpeng Li <kernellwp@...il.com>, Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-kernel@...r.kernel.org, Wanpeng Li <wanpeng.li@...mail.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Steve Muckle <steve.muckle@...aro.org>
Subject: Re: [PATCH] sched/cpufreq: don't trigger cpufreq update w/o real
 rt/deadline tasks running

On Wed, Apr 20, 2016 at 02:32:35AM +0200, Rafael J. Wysocki wrote:
> On Monday, April 18, 2016 01:51:24 PM Wanpeng Li wrote:
> > Sometimes update_curr() is called w/o tasks actually running, it is
> > captured by: 
> > 	u64 delta_exec = rq_clock_task(rq) - curr->se.exec_start;
> > We should not trigger cpufreq update in this case for rt/deadline
> > classes, and this patch fix it.
> > 
> > Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
> 
> The signed-off-by tag should agree with the From: header.  One way to achieve
> that is to add an extra From: line at the start of the changelog.
> 
> That said, this looks like a good catch that should go into 4.6 to me.
> 
> Peter, what do you think?

I'm confused by the Changelog. *what* ?