linux-kernel - RE: [PATCH] cpuidle: menu: Retain tick when shallow state is selected

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Message-ID: <000701d43bc1$5e0c2c50$1a2484f0$@net>
Date:   Fri, 24 Aug 2018 08:44:35 -0700
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Rafael J. Wysocki'" <rjw@...ysocki.net>
Cc:     "'LKML'" <linux-kernel@...r.kernel.org>,
        "'Leo Yan'" <leo.yan@...aro.org>,
        "'Daniel Lezcano'" <daniel.lezcano@...aro.org>,
        "'Frederic Weisbecker'" <frederic@...nel.org>,
        "'Linux PM'" <linux-pm@...r.kernel.org>,
        "'Peter Zijlstra'" <peterz@...radead.org>,
        "Doug Smythies" <dsmythies@...us.net>
Subject: RE: [PATCH] cpuidle: menu: Retain tick when shallow state is selected

On 2018.08.24 02:44 Rafael J. Wysocki wrote:
> On Tuesday, August 21, 2018 10:44:10 AM CEST Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> 
>> The case addressed by commit 5ef499cd571c (cpuidle: menu: Handle
>> stopped tick more aggressively) in the stopped tick case is present
>> when the tick has not been stopped yet too.

... [snip] ...

>> Fixes: 87c9fe6ee495 (cpuidle: menu: Avoid selecting shallow states with stopped tick)

... [snip] ...

> Due to the lack of objections, I'm inclined to queue this up.

I have been following these threads.
Recall that I was involved, over a period of months, in the original
"powernightmare" stuff.
I have revived my tests (and wish I had left myself better notes), and
am establishing a baseline before adding and trying this patch.
My baseline is actually two tests with and without the previous two patches (the ones
that were just sent a couple of days ago in "More power management updates for v4.19-rc1".
I might have those results in some presentable form by later today (it looks O.K.)
Results with this patch will take another couple of days.

... Doug