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

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Message-ID: <CANRm+Cy_KXSJqsgQ7BkxB8PrtQHUZ3VBmLr6MY3gno6_PVk8rA@mail.gmail.com>
Date:	Wed, 20 Apr 2016 08:48:41 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <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

2016-04-20 8:32 GMT+08:00 Rafael J. Wysocki <rjw@...ysocki.net>:
> 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.

Thanks for the tip Rafael, just send out v2 to fix it.

Regards,
Wanpeng Li