linux-kernel - Re: [PATCH] perf pmu-events: Fix the missing "cpu_clk

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Date:   Mon, 29 Jul 2019 11:16:58 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, kan.liang@...el.com,
        yao.jin@...el.com
Subject: Re: [PATCH] perf pmu-events: Fix the missing "cpu_clk_unhalted.core"

> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> index 1a91a197cafb..d413761621b0 100644
> --- a/tools/perf/pmu-events/jevents.c
> +++ b/tools/perf/pmu-events/jevents.c
> @@ -453,6 +453,7 @@ static struct fixed {
>  	{ "inst_retired.any_p", "event=0xc0" },
>  	{ "cpu_clk_unhalted.ref", "event=0x0,umask=0x03" },
>  	{ "cpu_clk_unhalted.thread", "event=0x3c" },
> +	{ "cpu_clk_unhalted.core", "event=0x3c" },

Not sure this is correct for non Atom.

On Atom thread==core, but that is not true with SMT/HyperThreading.

The big cores currently don't have this event, so it would
match incorrectly.

This has to be handled on the event list level, perhaps with
some enhancements.

-Andi