[PATCH 2/3] perf test: Introduce '-w --list' to list the available workloads

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Using it:

  $ perf test -w noplop
  No workload found: noplop
  $
  $ perf test -w
   Error: switch `w' requires a value
   Usage: perf test [<options>] [{list <test-name-fragment>|[<test-name-fragments>|<test-numbers>]}]

      -w, --workload <work>
                            workload to run for testing, use '-w --list' to list the available ones.
  $
  $ perf test -w --list
  noploop
  thloop
  leafloop
  sqrtloop
  brstack
  datasym
  landlock
  $

Would be good at some point to have a description in 'struct test_workload'.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/tests/builtin-test.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 2201f7ed432ce9f2..f0d10d2dd0d40019 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -505,10 +505,26 @@ static int perf_test__list(int argc, const char **argv)
 	return 0;
 }
 
+static int workloads__fprintf_list(FILE *fp)
+{
+	struct test_workload *twl;
+	int printed = 0;
+
+	workloads__for_each(twl)
+		printed += fprintf(fp, "%s\n", twl->name);
+
+	return printed;
+}
+
 static int run_workload(const char *work, int argc, const char **argv)
 {
 	struct test_workload *twl;
 
+	if (!strcmp(work, "--list")) {
+		workloads__fprintf_list(stdout);
+		return 0;
+	}
+
 	workloads__for_each(twl) {
 		if (!strcmp(twl->name, work))
 			return twl->func(argc, argv);
@@ -544,7 +560,7 @@ int cmd_test(int argc, const char **argv)
 	OPT_BOOLEAN('p', "parallel", &parallel, "Run the tests in parallel"),
 	OPT_BOOLEAN('S', "sequential", &sequential,
 		    "Run the tests one after another rather than in parallel"),
-	OPT_STRING('w', "workload", &workload, "work", "workload to run for testing"),
+	OPT_STRING('w', "workload", &workload, "work", "workload to run for testing, use '-w --list' to list the available ones."),
 	OPT_STRING(0, "dso", &dso_to_test, "dso", "dso to test"),
 	OPT_STRING(0, "objdump", &test_objdump_path, "path",
 		   "objdump binary to use for disassembly and annotations"),
-- 
2.47.0