linux-kernel - Re: [PATCH 2/2] perf, tools, list: Support matching by topic

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Date:   Wed, 19 Oct 2016 15:13:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     jolsa@...nel.org, linux-kernel@...r.kernel.org, mingo@...nel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] perf, tools, list: Support matching by topic

Em Wed, Oct 19, 2016 at 10:50:02AM -0700, Andi Kleen escreveu:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add support in perf list topic to only show events belonging to a specific
> vendor events topic. For example the following works now:
> 
> % perf list frontend
> List of pre-defined events (to be used in -e):
> 
>   stalled-cycles-frontend OR idle-cycles-frontend    [Hardware event]
> 
>   stalled-cycles-frontend OR cpu/stalled-cycles-frontend/ [Kernel PMU event]
> 
> frontend:
>   dsb2mite_switches.count
>        [Decode Stream Buffer (DSB)-to-MITE switches]
>   dsb2mite_switches.penalty_cycles
>        [Decode Stream Buffer (DSB)-to-MITE switch true penalty cycles]
>   dsb_fill.exceed_dsb_lines
>        [Cycles when Decode Stream Buffer (DSB) fill encounter more than 3 Decode Stream Buffer (DSB)
>         lines]
>   icache.hit
>        [Number of Instruction Cache, Streaming Buffer and Victim Cache Reads. both cacheable and
>         noncacheable, including UC fetches]
> ...
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/builtin-list.c | 6 ++++--
>  tools/perf/util/pmu.c     | 4 +++-
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> index 1095a6dada66..c00b0eb343c0 100644
> --- a/tools/perf/builtin-list.c
> +++ b/tools/perf/builtin-list.c
> @@ -67,9 +67,11 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
>  			print_symbol_events(NULL, PERF_TYPE_SOFTWARE,
>  					event_symbols_sw, PERF_COUNT_SW_MAX, raw_dump);
>  		else if (strcmp(argv[i], "cache") == 0 ||
> -			 strcmp(argv[i], "hwcache") == 0)
> +			 strcmp(argv[i], "hwcache") == 0) {

This is changing existing behaviour, please remove it. A separate patch
could either make it show both hwcache events and vendor cache events,
or you could make:

  perf list vendor cache

Do what you expect.

>  			print_hwcache_events(NULL, raw_dump);
> -		else if (strcmp(argv[i], "pmu") == 0)
> +			print_pmu_events(argv[i], raw_dump, !desc_flag,
> +					long_desc_flag, true);
> +		} else if (strcmp(argv[i], "pmu") == 0)
>  			print_pmu_events(NULL, raw_dump, !desc_flag,
>  						long_desc_flag, false);

What is this here?

>  		else if (strcmp(argv[i], "sdt") == 0)
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 101922b2a243..dc8eb30e8597 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -1142,7 +1142,9 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
>  			if (event_glob != NULL &&
>  			    !(strglobmatch_nocase(name, event_glob) ||
>  			      (!is_cpu && strglobmatch_nocase(alias->name,
> -						       event_glob))))
> +						       event_glob)) ||
> +			      (alias->topic &&
> +			       strglobmatch_nocase(alias->topic, event_glob))))
>  				continue;
>  
>  			if (is_cpu && !name_only && !alias->desc)
> -- 
> 2.5.5