linux-kernel - Re: [PATCH 1/2] perf symbols: Update the list of kernel idle symbols

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Message-ID: <20200120092844.GC608405@krava>
Date:   Mon, 20 Jan 2020 10:28:44 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf symbols: Update the list of kernel idle symbols

On Wed, Jan 15, 2020 at 04:29:48PM -0600, Kim Phillips wrote:
> "acpi_idle_do_entry", "acpi_processor_ffh_cstate_enter", and "idle_cpu"
> appear in 'perf top' output, at least on AMD systems.
> 
> Add them to perf's idle_symbols list, so they don't dominate 'perf top'
> output.
> 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Cong Wang <xiyou.wangcong@...il.com>
> Cc: Andi Kleen <ak@...ux.intel.com>
> Cc: Jin Yao <yao.jin@...ux.intel.com>
> Cc: Kan Liang <kan.liang@...ux.intel.com>
> Cc: Kim Phillips <kim.phillips@....com>
> Cc: Song Liu <songliubraving@...com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Cc: linux-perf-users@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Kim Phillips <kim.phillips@....com>
> ---
>  tools/perf/util/symbol.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 3b379b1296f1..f3120c4f47ad 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -635,9 +635,12 @@ int modules__parse(const char *filename, void *arg,
>  static bool symbol__is_idle(const char *name)
>  {
>  	const char * const idle_symbols[] = {
> +		"acpi_idle_do_entry",
> +		"acpi_processor_ffh_cstate_enter",
>  		"arch_cpu_idle",
>  		"cpu_idle",
>  		"cpu_startup_entry",
> +		"idle_cpu",
>  		"intel_idle",
>  		"default_idle",
>  		"native_safe_halt",

ok, at some point we should put this in strlist ;-)

Acked-by: Jiri Olsa <jolsa@...hat.com

thanks,
jirka