linux-kernel - Re: [PATCH] perf/x86/rapl: Enable Core RAPL for AMD

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Message-ID: <12153455.O9o76ZdvQC@natalenko.name>
Date:   Sun, 19 Feb 2023 12:52:42 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, hpa@...or.com,
        Wyes Karny <wyes.karny@....com>
Cc:     x86@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, gautham.shenoy@....com,
        ananth.narayan@....com, Wyes Karny <wyes.karny@....com>
Subject: Re: [PATCH] perf/x86/rapl: Enable Core RAPL for AMD

Hello.

On pátek 17. února 2023 17:13:54 CET Wyes Karny wrote:
> AMD processors support per-package and per-core energy monitoring
> through RAPL counters which can be accessed by users running in
> supervisor mode.
> 
> Core RAPL counters gives power consumption information per core.  For
> AMD processors the package level RAPL counter are already exposed to
> perf. Expose the core level RAPL counters also.
> 
> sudo perf stat -a --per-core -C 0-127 -e power/energy-cores/
> 
> Output:
> S0-D0-C0           2               8.73 Joules power/energy-cores/
> S0-D0-C1           2               8.73 Joules power/energy-cores/
> S0-D0-C2           2               8.73 Joules power/energy-cores/
> S0-D0-C3           2               8.73 Joules power/energy-cores/
> S0-D0-C4           2               8.73 Joules power/energy-cores/
> 
> Signed-off-by: Wyes Karny <wyes.karny@....com>
> ---
>  arch/x86/events/rapl.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 52e6e7ed4f78..d301bbbc3b93 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -537,7 +537,7 @@ static struct perf_msr intel_rapl_spr_msrs[] = {
>   * - want to use same event codes across both architectures
>   */
>  static struct perf_msr amd_rapl_msrs[] = {
> -	[PERF_RAPL_PP0]  = { 0, &rapl_events_cores_group, 0, false, 0 },
> +	[PERF_RAPL_PP0]  = { MSR_AMD_CORE_ENERGY_STATUS, &rapl_events_cores_group, test_msr, false, RAPL_MSR_MASK },
>  	[PERF_RAPL_PKG]  = { MSR_AMD_PKG_ENERGY_STATUS,  &rapl_events_pkg_group,   test_msr, false, RAPL_MSR_MASK },
>  	[PERF_RAPL_RAM]  = { 0, &rapl_events_ram_group,   0, false, 0 },
>  	[PERF_RAPL_PP1]  = { 0, &rapl_events_gpu_group,   0, false, 0 },
> @@ -764,7 +764,8 @@ static struct rapl_model model_spr = {
>  };
>  
>  static struct rapl_model model_amd_hygon = {
> -	.events		= BIT(PERF_RAPL_PKG),
> +	.events		= BIT(PERF_RAPL_PP0) |
> +			  BIT(PERF_RAPL_PKG),
>  	.msr_power_unit = MSR_AMD_RAPL_POWER_UNIT,
>  	.rapl_msrs      = amd_rapl_msrs,
>  };
> 

With this patch:

```
$ lscpu | grep 'Model name'
Model name:                      AMD Ryzen 9 5950X 16-Core Processor

$ sudo perf stat -a --per-core -C 0-15 -e power/energy-cores/ -- dd if=/dev/zero of=/dev/null bs=1M count=100000
100000+0 records in
100000+0 records out
104857600000 bytes (105 GB, 98 GiB) copied, 1,59252 s, 65,8 GB/s

Performance counter stats for 'system wide':

S0-D0-C0           1               1,56 Joules power/energy-cores/
S0-D0-C1           1               1,56 Joules power/energy-cores/
S0-D0-C2           1               1,56 Joules power/energy-cores/
S0-D0-C3           1               1,56 Joules power/energy-cores/
S0-D0-C4           1               1,56 Joules power/energy-cores/
S0-D0-C5           1               1,56 Joules power/energy-cores/
S0-D0-C6           1               1,56 Joules power/energy-cores/
S0-D0-C7           1               1,56 Joules power/energy-cores/
S0-D0-C8           1               1,56 Joules power/energy-cores/
S0-D0-C9           1               1,56 Joules power/energy-cores/
S0-D0-C10          1               1,56 Joules power/energy-cores/
S0-D0-C11          1               1,56 Joules power/energy-cores/
S0-D0-C12          1               1,56 Joules power/energy-cores/
S0-D0-C13          1               1,56 Joules power/energy-cores/
S0-D0-C14          1               1,56 Joules power/energy-cores/
S0-D0-C15          1               1,56 Joules power/energy-cores/

1,593982452 seconds time elapsed
```

Hence,

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

Thank you.

-- 
Oleksandr Natalenko (post-factum)