linux-kernel - Re: [PATCH 6/7] perf list: extend raw-dump to certain kind of events

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Date:	Fri, 13 Feb 2015 11:55:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Yunlong Song <yunlong.song@...wei.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org, wangnan0@...wei.com
Subject: Re: [PATCH 6/7] perf list: extend raw-dump to certain kind of events

Em Fri, Feb 13, 2015 at 09:11:54PM +0800, Yunlong Song escreveu:
> Extend 'perf list --raw-dump' to 'perf list --raw-dump [hw|sw|cache
> |tracepoint|pmu|event_glob]' in order to show the raw-dump of a
> certain kind of events rather than all of the events.

Again, please check that this doesn't break shell autocompletion, I
haven't checked, do you keep the existing behaviour, i.e. if does
--raw-dump without an argument shows all the events?

- Arnaldo
 
> Example
> Before this patch:
> $perf list --raw-dump hw
> branch-instructions branch-misses bus-cycles cache-misses
> cache-references cpu-cycles instructions stalled-cycles-backend
> stalled-cycles-frontend
> alignment-faults context-switches cpu-clock cpu-migrations
> emulation-faults major-faults minor-faults page-faults task-clock
> ...
> ...
> writeback:writeback_thread_start writeback:writeback_thread_stop
> writeback:writeback_wait_iff_congested
> writeback:writeback_wake_background writeback:writeback_wake_thread
> 
> As shown above, all of the events are printed.
> 
> After this patch:
> $perf list --raw-dump hw
> branch-instructions branch-misses bus-cycles cache-misses
> cache-references cpu-cycles instructions stalled-cycles-backend
> stalled-cycles-frontend
> 
> As shown above, only the hw events are printed.
> 
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
> ---
>  tools/perf/Documentation/perf-list.txt |  6 ++++++
>  tools/perf/builtin-list.c              | 21 ++++++++-------------
>  2 files changed, 14 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
> index 3e2aec9..4692d27 100644
> --- a/tools/perf/Documentation/perf-list.txt
> +++ b/tools/perf/Documentation/perf-list.txt
> @@ -127,6 +127,12 @@ To limit the list use:
>  One or more types can be used at the same time, listing the events for the
>  types specified.
>  
> +Support raw format:
> +
> +. '--raw-dump', shows the raw-dump of all the events.
> +. '--raw-dump [hw|sw|cache|tracepoint|pmu|event_glob]', shows the raw-dump of
> +  a certain kind of events.
> +
>  SEE ALSO
>  --------
>  linkperf:perf-stat[1], linkperf:perf-top[1],
> diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> index 003dec5..b81a62c 100644
> --- a/tools/perf/builtin-list.c
> +++ b/tools/perf/builtin-list.c
> @@ -36,38 +36,33 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
>  
>  	setup_pager();
>  
> -	if (raw_dump) {
> -		print_events(NULL, true);
> -		return 0;
> -	}
> -
>  	if (argc == 0) {
> -		print_events(NULL, false);
> +		print_events(NULL, raw_dump);
>  		return 0;
>  	}
>  
>  	for (i = 0; i < argc; ++i) {
>  		if (strcmp(argv[i], "tracepoint") == 0)
> -			print_tracepoint_events(NULL, NULL, false);
> +			print_tracepoint_events(NULL, NULL, raw_dump);
>  		else if (strcmp(argv[i], "hw") == 0 ||
>  			 strcmp(argv[i], "hardware") == 0)
>  			print_symbol_events(NULL, PERF_TYPE_HARDWARE,
> -					event_symbols_hw, PERF_COUNT_HW_MAX, false);
> +					event_symbols_hw, PERF_COUNT_HW_MAX, raw_dump);
>  		else if (strcmp(argv[i], "sw") == 0 ||
>  			 strcmp(argv[i], "software") == 0)
>  			print_symbol_events(NULL, PERF_TYPE_SOFTWARE,
> -					event_symbols_sw, PERF_COUNT_SW_MAX, false);
> +					event_symbols_sw, PERF_COUNT_SW_MAX, raw_dump);
>  		else if (strcmp(argv[i], "cache") == 0 ||
>  			 strcmp(argv[i], "hwcache") == 0)
> -			print_hwcache_events(NULL, false);
> +			print_hwcache_events(NULL, raw_dump);
>  		else if (strcmp(argv[i], "pmu") == 0)
> -			print_pmu_events(NULL, false);
> +			print_pmu_events(NULL, raw_dump);
>  		else {
>  			char *sep = strchr(argv[i], ':'), *s;
>  			int sep_idx;
>  
>  			if (sep == NULL) {
> -				print_events(argv[i], false);
> +				print_events(argv[i], raw_dump);
>  				continue;
>  			}
>  			sep_idx = sep - argv[i];
> @@ -76,7 +71,7 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
>  				return -1;
>  
>  			s[sep_idx] = '\0';
> -			print_tracepoint_events(s, s + sep_idx + 1, false);
> +			print_tracepoint_events(s, s + sep_idx + 1, raw_dump);
>  			free(s);
>  		}
>  	}
> -- 
> 1.8.5.5
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