From: Sudeep Holla <sudeep.holla@arm.com>
To: David Dai <davidai@google.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Rob Herring <robh@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
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>,
Marc Zyngier <maz@kernel.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 v7 2/2] cpufreq: add virtual-cpufreq driver
Date: Mon, 28 Oct 2024 10:44:50 +0000 [thread overview]
Message-ID: <Zx9rIjen30ArZd6k@bogus> (raw)
In-Reply-To: <20240919000837.1004642-3-davidai@google.com>
On Wed, Sep 18, 2024 at 05:08:33PM -0700, David Dai wrote:
> Introduce a virtualized cpufreq driver for guest kernels to improve
> performance and power of workloads within VMs.
>
> This driver does two main things:
>
> 1. Sends the frequency of vCPUs as a hint to the host. The host uses the
> hint to schedule the vCPU threads and decide physical CPU frequency.
>
> 2. If a VM does not support a virtualized FIE(like AMUs), it queries the
> host CPU frequency by reading a MMIO region of a virtual cpufreq device
> to update the guest's frequency scaling factor periodically. This enables
> accurate Per-Entity Load Tracking for tasks running in the guest.
>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
--
Regards,
Sudeep
next prev parent reply other threads:[~2024-10-28 10:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-19 0:08 [PATCH v7 0/2] Improve VM CPUfreq and task placement behavior David Dai
2024-09-19 0:08 ` [PATCH v7 1/2] dt-bindings: cpufreq: add virtual cpufreq device David Dai
2024-09-19 0:08 ` [PATCH v7 2/2] cpufreq: add virtual-cpufreq driver David Dai
2024-10-28 10:44 ` Sudeep Holla [this message]
2024-10-01 9:25 ` [PATCH v7 0/2] Improve VM CPUfreq and task placement behavior Viresh Kumar
2024-10-25 22:25 ` Saravana Kannan
2024-10-28 11:39 ` Rafael J. Wysocki
2024-10-28 12:33 ` Sudeep Holla
2024-10-28 12:43 ` Rafael J. Wysocki
2024-10-28 12:52 ` Sudeep Holla
2024-10-28 20:48 ` Saravana Kannan
2024-10-29 6:36 ` Viresh Kumar
2024-10-30 20:24 ` Saravana Kannan
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