linux-kernel - Re: [PATCH] perf c2c: fix '-e list'

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Date:   Wed, 27 Nov 2019 09:18:44 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf c2c: fix '-e list'

On Tue, Nov 26, 2019 at 11:34:42PM -0800, Ian Rogers wrote:
> When the event is passed as list, the default events should be listed as
> per 'perf mem record -e list'. Previous behavior is:
> 
> $ perf c2c record -e list
> failed: event 'list' not found, use '-e list' to get list of available events
> 
>  Usage: perf c2c record [<options>] [<command>]
>     or: perf c2c record [<options>] -- <command> [<options>]
> 
>     -e, --event <event>   event selector. Use 'perf mem record -e list' to list available events

man c2c page do say you should use 'perf mem' not 'perf c2c'
could you please change the man page as well?

> 
> New behavior:
> 
> $ perf c2c record -e list
> ldlat-loads  : available
> ldlat-stores : available
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/builtin-c2c.c | 20 ++++++++++++++++++--
>  1 file changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index e69f44941aad..dd69cd218e4c 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -2872,10 +2872,26 @@ static int perf_c2c__report(int argc, const char **argv)
>  static int parse_record_events(const struct option *opt,
>  			       const char *str, int unset __maybe_unused)
>  {
> +	int j;
>  	bool *event_set = (bool *) opt->value;
>  
> -	*event_set = true;
> -	return perf_mem_events__parse(str);
> +	if (strcmp(str, "list")) {
> +		*event_set = true;
> +		if (!perf_mem_events__parse(str))
> +			return 0;
> +
> +		exit(-1);
> +	}
> +	for (j = 0; j < PERF_MEM_EVENTS__MAX; j++) {
> +		struct perf_mem_event *e = &perf_mem_events[j];
> +
> +		fprintf(stderr, "%-13s%-*s%s\n",
> +			e->tag,
> +			verbose > 0 ? 25 : 0,
> +			verbose > 0 ? perf_mem_events__name(j) : "",
> +			e->supported ? ": available" : "");
> +	}

there's same loop in builtin-mem.c, could you please put it
to function in mem-events.c?

thanks,
jirka