[PATCH v5 4/4] perf-stat: add documentation for -b option

[Song Liu]

Add documentation to perf-stat -b option, which stats event for BPF
programs.

Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
 tools/perf/Documentation/perf-stat.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 5d4a673d7621a..15b9a646e853d 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -75,6 +75,20 @@ report::
 --tid=<tid>::
         stat events on existing thread id (comma separated list)
 
+-b::
+--bpf-prog::
+        stat events on existing bpf program id (comma separated list),
+        requiring root righs. For example:
+
+  # perf stat -e cycles,instructions --bpf-prog 17247 --timeout 1000
+
+   Performance counter stats for 'BPF program(s) 17247':
+
+             85,967      cycles
+             28,982      instructions              #    0.34  insn per cycle
+
+        1.102235068 seconds time elapsed
+
 ifdef::HAVE_LIBPFM[]
 --pfm-events events::
 Select a PMU event using libpfm4 syntax (see http://perfmon2.sf.net)
-- 
2.24.1