linux-kernel - Re: [PATCH 2/3] perf/x86/rapl: Use standard Energy Unit for SPR Dram RAPL domain

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Message-ID: <433dcc871ecbee4a2ddd21b3ae23be7100002149.camel@intel.com>
Date:   Sun, 30 Oct 2022 16:31:30 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     peterz@...radead.org, rjw@...ysocki.net, len.brown@...el.com
Cc:     mingo@...hat.com, linux-pm@...r.kernel.org, x86@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...ux.intel.com,
        artem.bityutskiy@...ux.intel.com
Subject: Re: [PATCH 2/3] perf/x86/rapl: Use standard Energy Unit for SPR
 Dram RAPL domain

Hi, Peter,

Can you please consider this as tip material?
This patch series does not get merged altogether. The intel-rapl and
turbostat fixes have been merged by Rafael and Len respectively.

thanks,
rui

On Sat, 2022-09-24 at 13:47 +0800, Zhang Rui wrote:
> Intel Xeon servers used to use a fixed energy resolution (15.3uj) for
> Dram RAPL domain. But on SPR, Dram RAPL domain follows the standard
> energy resolution as described in MSR_RAPL_POWER_UNIT.
> 
> Remove the SPR Dram energy unit quirk.
> 
> Fixes: bcfd218b6679 ("perf/x86/rapl: Add support for Intel SPR
> platform")
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> Tested-by: Wang Wendy <wendy.wang@...el.com>
> Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
> ---
>  arch/x86/events/rapl.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
> index 77e3a47af5ad..7d8db681880d 100644
> --- a/arch/x86/events/rapl.c
> +++ b/arch/x86/events/rapl.c
> @@ -619,12 +619,8 @@ static int rapl_check_hw_unit(struct rapl_model
> *rm)
>  	case RAPL_UNIT_QUIRK_INTEL_HSW:
>  		rapl_hw_unit[PERF_RAPL_RAM] = 16;
>  		break;
> -	/*
> -	 * SPR shares the same DRAM domain energy unit as HSW, plus it
> -	 * also has a fixed energy unit for Psys domain.
> -	 */
> +	/* SPR uses a fixed energy unit for Psys domain. */
>  	case RAPL_UNIT_QUIRK_INTEL_SPR:
> -		rapl_hw_unit[PERF_RAPL_RAM] = 16;
>  		rapl_hw_unit[PERF_RAPL_PSYS] = 0;
>  		break;
>  	default: