linux-kernel - Re: [PATCH 0/3] cpuidle: small improvements & fixes for menu governor (resend)

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Date:	Thu, 05 Nov 2015 23:34:29 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	riel@...hat.com
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	rafael.j.wysocki@...el.com, arjan@...ux.intel.com,
	len.brown@...el.com, daniel.lezcano@...aro.org
Subject: Re: [PATCH 0/3] cpuidle: small improvements & fixes for menu governor (resend)

On Tuesday, November 03, 2015 05:34:16 PM riel@...hat.com wrote:
> While working on a paravirt cpuidle driver for KVM guests, I
> noticed a number of small logic errors in the menu governor
> code.
> 
> These patches should get rid of some artifacts that can break
> the logic in the menu governor under certain corner cases, and
> make idle state selection work better on CPUs with long C1 exit
> latencies.
> 
> I have not seen any adverse effects with them in my (quick)
> tests. As expected, they do not seem to do much on systems with
> many power states and very low C1 exit latencies and target residencies. 

Thanks!

The patches look good to me.

I might apply [1-2/3] right away, but I'm a bit hesitant about the [3/3] (I'd
like it to spend some time in linux-next before it goes to Linus).  Also, we've
lived without these changes for quite some time and I don't want to stretch the
process too much, so I'll queue them up for v4.5 if that's not a problem.

Thanks,
Rafael

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