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| author | David Dai <davidai@google.com> | 2024-09-19 03:08:33 +0300 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2024-10-29 09:35:14 +0300 |
| commit | 4fd06a5358e0d888d1bf23d274971ea7d1f45aad (patch) | |
| tree | 014938156f36840f3aa89efd9b5825507af39329 /include/linux/arch_topology.h | |
| parent | 984638e4430b75bd38dba723e42aad4c748fed70 (diff) | |
| download | linux-4fd06a5358e0d888d1bf23d274971ea7d1f45aad.tar.xz | |
cpufreq: add virtual-cpufreq driver
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.
Co-developed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: David Dai <davidai@google.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'include/linux/arch_topology.h')
| -rw-r--r-- | include/linux/arch_topology.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index b721f360d759..d5d848849408 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -49,6 +49,7 @@ enum scale_freq_source { SCALE_FREQ_SOURCE_CPUFREQ = 0, SCALE_FREQ_SOURCE_ARCH, SCALE_FREQ_SOURCE_CPPC, + SCALE_FREQ_SOURCE_VIRT, }; struct scale_freq_data { |