Re: [PATCH v7 0/2] Improve VM CPUfreq and task placement behavior

[Saravana Kannan]

On Tue, Oct 1, 2024 at 2:25 AM Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
>
> On 18-09-24, 17:08, David Dai wrote:
> > Hi,
> >
> > This patch series is a continuation of the talk Saravana gave at LPC 2022
> > titled "CPUfreq/sched and VM guest workload problems" [1][2][3]. The gist
> > of the talk is that workloads running in a guest VM get terrible task
> > placement and CPUfreq behavior when compared to running the same workload
> > in the host. Effectively, no EAS(Energy Aware Scheduling) for threads
> > inside VMs. This would make power and performance terrible just by running
> > the workload in a VM even if we assume there is zero virtualization
> > overhead.
>
> > David Dai (2):
> >   dt-bindings: cpufreq: add virtual cpufreq device
> >   cpufreq: add virtual-cpufreq driver
> >
> >  .../cpufreq/qemu,virtual-cpufreq.yaml         |  48 +++
> >  drivers/cpufreq/Kconfig                       |  14 +
> >  drivers/cpufreq/Makefile                      |   1 +
> >  drivers/cpufreq/virtual-cpufreq.c             | 333 ++++++++++++++++++
> >  include/linux/arch_topology.h                 |   1 +
> >  5 files changed, 397 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/cpufreq/qemu,virtual-cpufreq.yaml
> >  create mode 100644 drivers/cpufreq/virtual-cpufreq.c
>
> LGTM.
>
> Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

Rafael/Viresh,

Nudge... Any chance this will get pulled into 6.12?

Thanks,
Saravana