linux-kernel - Re: [PATCH 3/3 v2] perf symbols: convert symbol__is

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Date:   Mon, 10 Feb 2020 18:51:53 +0000
From:   Song Liu <songliubraving@...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>,
        Andi Kleen <ak@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3 v2] perf symbols: convert symbol__is_idle to use
 strlist



> On Feb 10, 2020, at 8:31 AM, Kim Phillips <kim.phillips@....com> wrote:
> 
> Use the more optimized strlist implementation to do the idle function
> lookup.
> 
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Andi Kleen <ak@...ux.intel.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: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Cong Wang <xiyou.wangcong@...il.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>
> ---
> v2: new this series, based on Jiri's comment:
> 
> https://lore.kernel.org/lkml/20200120092844.GC608405@krava/
> 
> ...and this time with the Cc list intact.
> 
> tools/perf/util/symbol.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index f3120c4f47ad..1077013d8ce2 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -654,13 +654,17 @@ static bool symbol__is_idle(const char *name)
> 		NULL
> 	};
> 	int i;
> +	static struct strlist *idle_symbols_list;

nit, probably just personal preference:

Maybe move idle_symbols_list out of the function and add the logic 
to symbol__init()?

Other than this:

Acked-by: Song Liu <songliubraving@...com>

> 
> -	for (i = 0; idle_symbols[i]; i++) {
> -		if (!strcmp(idle_symbols[i], name))
> -			return true;
> -	}
> +	if (idle_symbols_list)
> +		return strlist__has_entry(idle_symbols_list, name);
> 
> -	return false;
> +	idle_symbols_list = strlist__new(NULL, NULL);
> +
> +	for (i = 0; idle_symbols[i]; i++)
> +		strlist__add(idle_symbols_list, idle_symbols[i]);
> +
> +	return strlist__has_entry(idle_symbols_list, name);
> }
> 
> static int map__process_kallsym_symbol(void *arg, const char *name,
> -- 
> 2.25.0
>