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From: Marc Zyngier <maz@kernel.org>
To: David Dai <davidai@google.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Saravana Kannan <saravanak@google.com>,
	Quentin Perret <qperret@google.com>,
	Masami Hiramatsu <mhiramat@google.com>,
	Will Deacon <will@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Pavan Kondeti <quic_pkondeti@quicinc.com>,
	Gupta Pankaj <pankaj.gupta@amd.com>, Mel Gorman <mgorman@suse.de>,
	kernel-team@android.com, linux-pm@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 1/2] dt-bindings: cpufreq: add virtual cpufreq device
Date: Wed, 15 Nov 2023 08:49:36 +0000	[thread overview]
Message-ID: <865y231jvj.wl-maz@kernel.org> (raw)
In-Reply-To: <20231111014933.1934562-2-davidai@google.com>

On Sat, 11 Nov 2023 01:49:29 +0000,
David Dai <davidai@google.com> wrote:
> 
> Adding bindings to represent a virtual cpufreq device.
> 
> Virtual machines may expose MMIO regions for a virtual cpufreq device
> for guests to read frequency information or to request frequency
> selection. The virtual cpufreq device has an individual controller for
> each frequency domain.

I would really refrain form having absolute frequencies here. A
virtual machine can be migrated, and there are *zero* guarantees that
the target system has the same clock range as the source.

This really should be a relative number, much like the capacity. That,
at least, can be migrated across systems.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

  parent reply	other threads:[~2023-11-15  8:49 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-11  1:49 [PATCH v4 0/2] Improve VM CPUfreq and task placement behavior David Dai
2023-11-11  1:49 ` [PATCH v4 1/2] dt-bindings: cpufreq: add virtual cpufreq device David Dai
2023-11-15  6:27   ` Viresh Kumar
2023-11-16 16:22     ` Rob Herring
2023-11-15  8:49   ` Marc Zyngier [this message]
2023-12-07 22:44     ` Saravana Kannan
2023-12-08  8:52       ` Marc Zyngier
2024-01-12 22:02         ` Saravana Kannan
2024-01-13  9:37           ` Marc Zyngier
2024-01-16 23:47             ` Saravana Kannan
2023-12-08 12:45   ` Sudeep Holla
2024-01-12 22:15     ` Saravana Kannan
2024-01-15 16:28   ` Hongyan Xia
2023-11-11  1:49 ` [PATCH v4 2/2] cpufreq: add virtual-cpufreq driver David Dai
2023-11-15  6:29   ` Viresh Kumar
2023-12-08  1:18     ` David Dai
2023-12-08  9:51       ` Viresh Kumar
2024-01-15 16:58   ` Hongyan Xia
2023-11-13 12:20 ` [PATCH v4 0/2] Improve VM CPUfreq and task placement behavior Hongyan Xia
2023-11-13 12:26   ` Marc Zyngier

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