linux-kernel - Re: [PATCH v3] perf c2c: fix '-e list'

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Date:   Mon, 11 May 2020 12:55:25 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3] perf c2c: fix '-e list'

Em Thu, May 07, 2020 at 03:06:04PM -0700, Ian Rogers escreveu:
> 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
> 
> New behavior:
> 
> $ perf c2c record -e list
> ldlat-loads  : available
> ldlat-stores : available
> 
> v3: is a rebase.
> v2: addresses review comments by Jiri Olsa.

Thanks, applied and tested, Jiri, can I have your Reviewed-by?

- Arnaldo

> https://lore.kernel.org/lkml/20191127081844.GH32367@krava/
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/Documentation/perf-c2c.txt |  2 +-
>  tools/perf/builtin-c2c.c              |  9 ++++++++-
>  tools/perf/builtin-mem.c              | 24 +++++++-----------------
>  tools/perf/util/mem-events.c          | 15 +++++++++++++++
>  tools/perf/util/mem-events.h          |  2 ++
>  5 files changed, 33 insertions(+), 19 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-c2c.txt b/tools/perf/Documentation/perf-c2c.txt
> index 2133eb320cb0..98efdab5fbd4 100644
> --- a/tools/perf/Documentation/perf-c2c.txt
> +++ b/tools/perf/Documentation/perf-c2c.txt
> @@ -40,7 +40,7 @@ RECORD OPTIONS
>  --------------
>  -e::
>  --event=::
> -	Select the PMU event. Use 'perf mem record -e list'
> +	Select the PMU event. Use 'perf c2c record -e list'
>  	to list available events.
>  
>  -v::
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index 1baf4cae086f..d617d5682c68 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -2887,8 +2887,15 @@ static int parse_record_events(const struct option *opt,
>  {
>  	bool *event_set = (bool *) opt->value;
>  
> +	if (!strcmp(str, "list")) {
> +		perf_mem_events__list();
> +		exit(0);
> +	}
> +	if (perf_mem_events__parse(str))
> +		exit(-1);
> +
>  	*event_set = true;
> -	return perf_mem_events__parse(str);
> +	return 0;
>  }
>  
>  
> diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
> index 68a7eb84561a..3523279af6af 100644
> --- a/tools/perf/builtin-mem.c
> +++ b/tools/perf/builtin-mem.c
> @@ -38,26 +38,16 @@ static int parse_record_events(const struct option *opt,
>  			       const char *str, int unset __maybe_unused)
>  {
>  	struct perf_mem *mem = *(struct perf_mem **)opt->value;
> -	int j;
>  
> -	if (strcmp(str, "list")) {
> -		if (!perf_mem_events__parse(str)) {
> -			mem->operation = 0;
> -			return 0;
> -		}
> -		exit(-1);
> +	if (!strcmp(str, "list")) {
> +		perf_mem_events__list();
> +		exit(0);
>  	}
> +	if (perf_mem_events__parse(str))
> +		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" : "");
> -	}
> -	exit(0);
> +	mem->operation = 0;
> +	return 0;
>  }
>  
>  static const char * const __usage[] = {
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index aa29589f6904..ea0af0bc4314 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -103,6 +103,21 @@ int perf_mem_events__init(void)
>  	return found ? 0 : -ENOENT;
>  }
>  
> +void perf_mem_events__list(void)
> +{
> +	int j;
> +
> +	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" : "");
> +	}
> +}
> +
>  static const char * const tlb_access[] = {
>  	"N/A",
>  	"HIT",
> diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> index f1389bdae7bf..904dad34f7f7 100644
> --- a/tools/perf/util/mem-events.h
> +++ b/tools/perf/util/mem-events.h
> @@ -39,6 +39,8 @@ int perf_mem_events__init(void);
>  
>  char *perf_mem_events__name(int i);
>  
> +void perf_mem_events__list(void);
> +
>  struct mem_info;
>  int perf_mem__tlb_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
>  int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info);
> -- 
> 2.26.2.645.ge9eca65c58-goog
> 

-- 

- Arnaldo