linux-kernel - [PATCH v2 1/1] perf lock info: Display both map and thread by default

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Date: Thu,  2 May 2024 09:14:45 +0000
From: Nick Forrington <nick.forrington@....com>
To: linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Cc: Nick Forrington <nick.forrington@....com>,
	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: [PATCH v2 1/1] perf lock info: Display both map and thread by default

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              | 22 +++++++++++++++++-----
 2 files changed, 19 insertions(+), 7 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..86c68c39aac0 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -1483,11 +1483,16 @@ static int dump_info(void)
 
 	if (info_threads)
 		dump_threads();
-	else if (info_map)
+
+	if (info_map) {
+		if (info_threads)
+			fputc('\n', lock_output);
 		dump_map();
-	else {
+	}
+
+	if (!info_threads && !info_map) {
 		rc = -1;
-		pr_err("Unknown type of information\n");
+		pr_err("No lock info specified\n");
 	}
 
 	return rc;
@@ -2578,9 +2583,9 @@ 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 only the thread list in perf.data"),
 	OPT_BOOLEAN('m', "map", &info_map,
-		    "map of lock instances (address:name table)"),
+		    "dump only the map of lock instances (address:name table)"),
 	OPT_PARENT(lock_options)
 	};
 
@@ -2694,6 +2699,13 @@ 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);
-- 
2.44.0