Re: [PATCH] idle, thermal, acpi: Remove home grown idle implementations

From: Rafael J. Wysocki
Date: Wed Jun 04 2014 - 17:17:40 EST

On Wednesday, June 04, 2014 01:58:12 AM Jacob Pan wrote:
> On Wed, 4 Jun 2014 10:54:18 +0200
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> >
> > I'm still sitting on this patch. Jacub you were going to make it play
> > nice with QoS?
> >
> I had a patchset to work through system PM QOS and still maintain the
> idle injection efficiency. When I saw you did not merge the patch
> below, I thought you have abandoned it :)
> The only issue as per our last discussion is the lack of notification
> when PM QOS cannot be met. But that is intrinsic to PM QOS itself.
> I also consulted with Arjan and looked at directly intercept with
> intel_idle since both intel_powerclamp and intel_idle are arch specific
> drivers. But I think that is hard to do at per idle period basis,
> since we should still allow "natural" idle during the forced idle time.
> So, I think we can take a two stepped approach,
> 1. integrate your patch with a
> updated version of such that there
> is no performance/efficiency regression.
> 2. add notification mechanism to system qos when constraints cannot be
> met.

And then there's a question about how the notification would be supposed to
work. So I guess we can proceed with 1. and really leave 2. for some time
in the future ATM.


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