[PATCH 3/3] perf test: Document the -w/--workload option

[Arnaldo Carvalho de Melo <acme@kernel.org>]

From: Arnaldo Carvalho de Melo <acme@redhat.com>

Wasn't documented so far, mention that it is mostly used in the shell
regression tests.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/Documentation/perf-test.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/Documentation/perf-test.txt b/tools/perf/Documentation/perf-test.txt
index 9acb8d1f658890e9..62ce705d365f0442 100644
--- a/tools/perf/Documentation/perf-test.txt
+++ b/tools/perf/Documentation/perf-test.txt
@@ -48,3 +48,17 @@ OPTIONS
 
 --dso::
 	Specify a DSO for the "Symbols" test.
+
+-w::
+--workload=::
+	Run a built-in workload, to list them use '-w --list', current ones include:
+	noploop, thloop, leafloop, sqrtloop, brstack, datasym and landlock.
+
+	Used with the shell script regression tests.
+
+	Some accept an extra parameter:
+
+		seconds: leafloop, noploop, sqrtloop, thloop
+		nrloops: brstack
+
+	The datasym and landlock workloads don't accept any.
-- 
2.47.0