linux-hardening - Re: [PATCH 0/6] Add per-core RAPL energy counter support for AMD CPUs

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Message-ID: <2733323.mvXUDI8C0e@natalenko.name>
Date: Mon, 10 Jun 2024 16:28:11 +0200
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
 namhyung@...nel.org, mark.rutland@....com,
 alexander.shishkin@...ux.intel.com, jolsa@...nel.org, irogers@...gle.com,
 adrian.hunter@...el.com, kan.liang@...ux.intel.com, tglx@...utronix.de,
 bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, kees@...nel.org,
 gustavoars@...nel.org, Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-hardening@...r.kernel.org, ananth.narayan@....com,
 gautham.shenoy@....com, kprateek.nayak@....com, ravi.bangoria@....com,
 sandipan.das@....com, linux-pm@...r.kernel.org,
 Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>
Subject: Re: [PATCH 0/6] Add per-core RAPL energy counter support for AMD CPUs

Hello.

On pondělí 10. června 2024 12:07:45, SELČ Dhananjay Ugwekar wrote:
> Currently the energy-cores event in the power PMU aggregates energy
> consumption data at a package level. On the other hand the core energy
> RAPL counter in AMD CPUs has a core scope (which means the energy 
> consumption is recorded separately for each core). Earlier efforts to add
> the core event in the power PMU had failed [1], due to the difference in 
> the scope of these two events. Hence, there is a need for a new core scope
> PMU.
> 
> This patchset adds a new "power_per_core" PMU alongside the existing
> "power" PMU, which will be responsible for collecting the new
> "energy-per-core" event.
> 
> Tested the package level and core level PMU counters with workloads
> pinned to different CPUs.
> 
> Results with workload pinned to CPU 1 in Core 1 on an AMD Zen4 Genoa 
> machine:
> 
> $ perf stat -a --per-core -e power_per_core/energy-per-core/ sleep 1
> 
>  Performance counter stats for 'system wide':
> 
> S0-D0-C0         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C1         1          5.72 Joules power_per_core/energy-per-core/
> S0-D0-C2         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C3         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C4         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C5         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C6         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C7         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C8         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C9         1          0.02 Joules power_per_core/energy-per-core/
> S0-D0-C10        1          0.02 Joules power_per_core/energy-per-core/
> 
> [1]: https://lore.kernel.org/lkml/3e766f0e-37d4-0f82-3868-31b14228868d@linux.intel.com/
> 
> This patchset applies cleanly on top of v6.10-rc3 as well as latest 
> tip/master.
> 
> Dhananjay Ugwekar (6):
>   perf/x86/rapl: Fix the energy-pkg event for AMD CPUs
>   perf/x86/rapl: Rename rapl_pmu variables
>   perf/x86/rapl: Make rapl_model struct global
>   perf/x86/rapl: Move cpumask variable to rapl_pmus struct
>   perf/x86/rapl: Add wrapper for online/offline functions
>   perf/x86/rapl: Add per-core energy counter support for AMD CPUs
> 
>  arch/x86/events/rapl.c | 311 ++++++++++++++++++++++++++++++-----------
>  1 file changed, 233 insertions(+), 78 deletions(-)
> 
> 

With my CPU:

  Model name:             AMD Ryzen 9 5950X 16-Core Processor

and this workload:

$ taskset -c 1 dd if=/dev/zero of=/dev/null

the following result is got:

$ sudo perf stat -a --per-core -e power_per_core/energy-per-core/ sleep 1

 Performance counter stats for 'system wide':

S0-D0-C0              1               1,70 Joules power_per_core/energy-per-core/
S0-D0-C1              1               8,83 Joules power_per_core/energy-per-core/
S0-D0-C2              1               0,17 Joules power_per_core/energy-per-core/
S0-D0-C3              1               0,33 Joules power_per_core/energy-per-core/
S0-D0-C4              1               0,14 Joules power_per_core/energy-per-core/
S0-D0-C5              1               0,33 Joules power_per_core/energy-per-core/
S0-D0-C6              1               0,25 Joules power_per_core/energy-per-core/
S0-D0-C7              1               0,19 Joules power_per_core/energy-per-core/
S0-D0-C8              1               0,66 Joules power_per_core/energy-per-core/
S0-D0-C9              1               1,71 Joules power_per_core/energy-per-core/
S0-D0-C10             1               0,38 Joules power_per_core/energy-per-core/
S0-D0-C11             1               1,69 Joules power_per_core/energy-per-core/
S0-D0-C12             1               0,22 Joules power_per_core/energy-per-core/
S0-D0-C13             1               0,11 Joules power_per_core/energy-per-core/
S0-D0-C14             1               0,49 Joules power_per_core/energy-per-core/
S0-D0-C15             1               0,37 Joules power_per_core/energy-per-core/

       1,002409590 seconds time elapsed

If it is as expected, please add my:

Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>

Thank you.

-- 
Oleksandr Natalenko (post-factum)
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