linux-kernel - Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests

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Message-ID: <20150816035056.31346.59624@quantum>
Date:	Sat, 15 Aug 2015 20:50:56 -0700
From:	Michael Turquette <mturquette@...libre.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	"Morten Rasmussen" <morten.rasmussen@....com>
Cc:	mingo@...hat.com, vincent.guittot@...aro.org,
	daniel.lezcano@...aro.org,
	"Dietmar Eggemann" <Dietmar.Eggemann@....com>, yuyang.du@...el.com,
	rjw@...ysocki.net, "Juri Lelli" <Juri.Lelli@....com>,
	sgurrappadi@...dia.com, pang.xunlei@....com.cn,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests

Quoting Peter Zijlstra (2015-08-15 05:48:17)
> 
> 
> So this OPP thing, I think that got mentioned once earlier in this patch
> set, wth is that?

OPP == OPerating Point == P-state

In System-on-chip Land OPP is a very common term, roughly defined as a
frequency & voltage pair that makes up a performance state.

In other words, OPP is the P-state of the non-ACPI world.

Similarly DVFS is sometimes confused as a brand new file system, but it
is also a very standardized acronym amongst SoC vendors meaning
frequency and voltage scaling.

Regards,
Mike

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