perf test: Introduce --list-workloads to list the available workloads

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 '--list-workloads' to list the available ones.
  $
  $ perf test --list-workloads
  noploop
  thloop
  leafloop
  sqrtloop
  brstack
  datasym
  landlock
  $

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

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Clark Williams <williams@redhat.com>
Link: https://lore.kernel.org/r/20241020021842.1752770-3-acme@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index b47d53764d81566b6b0ada2a847612133e454d31..7d27e30d9b2db703f7c5fd489659ada26a0dc4e4 100644 (file)
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -505,6 +505,17 @@ 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;
@@ -535,6 +546,7 @@ int cmd_test(int argc, const char **argv)
        };
        const char *skip = NULL;
        const char *workload = NULL;
+       bool list_workloads = false;
        const struct option test_options[] = {
        OPT_STRING('s', "skip", &skip, "tests", "tests to skip"),
        OPT_INCR('v', "verbose", &verbose,
@@ -544,7 +556,8 @@ 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 '--list-workloads' to list the available ones."),
+       OPT_BOOLEAN(0, "list-workloads", &list_workloads, "List the available builtin workloads to use with -w/--workload"),
        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"),
@@ -570,6 +583,11 @@ int cmd_test(int argc, const char **argv)
        if (workload)
                return run_workload(workload, argc, argv);
 
+       if (list_workloads) {
+               workloads__fprintf_list(stdout);
+               return 0;
+       }
+
        if (dont_fork)
                sequential = true;
        else if (parallel)