linux-kernel - Re: [PATCH 1/1] perf lock info: Display both map and thread by default

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Date: Mon, 3 Jun 2024 10:37:57 +0100
From: Nick Forrington <nick.forrington@....com>
To: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 namhyung@...nel.org
Cc: Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
 Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>
Subject: Re: [PATCH 1/1] perf lock info: Display both map and thread by
 default

Is this ok to be applied now?

Thanks,
Nick

On 13/05/2024 10:14, Nick Forrington wrote:
> Change "perf lock info" argument handling to:
>
> Display both map and thread info (rather than an error) when neither are
> specified.
>
> Display both map and thread info (rather than just thread info) when
> both are requested.
>
> Signed-off-by: Nick Forrington <nick.forrington@....com>
> ---
>   tools/perf/Documentation/perf-lock.txt |  4 ++--
>   tools/perf/builtin-lock.c              | 27 ++++++++++++++------------
>   2 files changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
> index f5938d616d75..57a940399de0 100644
> --- a/tools/perf/Documentation/perf-lock.txt
> +++ b/tools/perf/Documentation/perf-lock.txt
> @@ -111,11 +111,11 @@ INFO OPTIONS
>   
>   -t::
>   --threads::
> -	dump thread list in perf.data
> +	dump only the thread list in perf.data
>   
>   -m::
>   --map::
> -	dump map of lock instances (address:name table)
> +	dump only the map of lock instances (address:name table)
>   
>   
>   CONTENTION OPTIONS
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index 230461280e45..7eb115aeb927 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -1477,20 +1477,16 @@ static void dump_map(void)
>   		fprintf(lock_output, " %#llx: %s\n", (unsigned long long)st->addr, st->name);
>   }
>   
> -static int dump_info(void)
> +static void dump_info(void)
>   {
> -	int rc = 0;
> -
>   	if (info_threads)
>   		dump_threads();
> -	else if (info_map)
> +
> +	if (info_map) {
> +		if (info_threads)
> +			fputc('\n', lock_output);
>   		dump_map();
> -	else {
> -		rc = -1;
> -		pr_err("Unknown type of information\n");
>   	}
> -
> -	return rc;
>   }
>   
>   static const struct evsel_str_handler lock_tracepoints[] = {
> @@ -1992,7 +1988,7 @@ static int __cmd_report(bool display_info)
>   
>   	setup_pager();
>   	if (display_info) /* used for info subcommand */
> -		err = dump_info();
> +		dump_info();
>   	else {
>   		combine_result();
>   		sort_result();
> @@ -2578,9 +2574,9 @@ int cmd_lock(int argc, const char **argv)
>   
>   	const struct option info_options[] = {
>   	OPT_BOOLEAN('t', "threads", &info_threads,
> -		    "dump thread list in perf.data"),
> +		    "dump the thread list in perf.data"),
>   	OPT_BOOLEAN('m', "map", &info_map,
> -		    "map of lock instances (address:name table)"),
> +		    "dump the map of lock instances (address:name table)"),
>   	OPT_PARENT(lock_options)
>   	};
>   
> @@ -2694,6 +2690,13 @@ int cmd_lock(int argc, const char **argv)
>   			if (argc)
>   				usage_with_options(info_usage, info_options);
>   		}
> +
> +		/* If neither threads nor map requested, display both */
> +		if (!info_threads && !info_map) {
> +			info_threads = true;
> +			info_map = true;
> +		}
> +
>   		/* recycling report_lock_ops */
>   		trace_handler = &report_lock_ops;
>   		rc = __cmd_report(true);