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

Started byPeter Zijlstra <peterz@infradead.org>
First post2015-08-15 22:00 +0200
Last post2015-08-17 20:00 +0200
Articles 3 — 3 participants

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  Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change  requests Peter Zijlstra <peterz@infradead.org> - 2015-08-15 22:00 +0200
    Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests Michael Turquette <mturquette@baylibre.com> - 2015-08-16 06:00 +0200
    Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-08-17 20:00 +0200

#1208146 — Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests

FromPeter Zijlstra <peterz@infradead.org>
Date2015-08-15 22:00 +0200
SubjectRe: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests
Message-ID<pXPMv-2Vm-41@gated-at.bofh.it>

So this OPP thing, I think that got mentioned once earlier in this patch
set, wth is that?
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#1208198 — Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests

FromMichael Turquette <mturquette@baylibre.com>
Date2015-08-16 06:00 +0200
SubjectRe: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests
Message-ID<pXXgZ-5fc-1@gated-at.bofh.it>
In reply to#1208146
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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#1208765 — Re: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests

From"Rafael J. Wysocki" <rjw@rjwysocki.net>
Date2015-08-17 20:00 +0200
SubjectRe: [RFCv5 PATCH 41/46] sched/fair: add triggers for OPP change requests
Message-ID<pYwRt-654-19@gated-at.bofh.it>
In reply to#1208146
On Saturday, August 15, 2015 02:48:17 PM Peter Zijlstra wrote:
> 
> So this OPP thing, I think that got mentioned once earlier in this patch
> set, wth is that?

OPP stands for Operating Performance Points.  It is a library for representing
working clock-voltage combinations.

Described in Documentation/power/opp.txt (but may be outdated as there's some
work on it going on).

CC Viresh who's working on it right now.

Thanks,
Rafael

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