perf kmem: Show usage if no option is specified
As Ingo suggested, make "perf kmem" show help information.
"perf kmem stat [--caller] [--alloc] .." will show memory
statistics.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
LKML-Reference: <4B20A195.8030106@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/Documentation/perf-kmem.txt b/tools/perf/Documentation/perf-kmem.txt
index 44b0ce3..eac4d852e 100644
--- a/tools/perf/Documentation/perf-kmem.txt
+++ b/tools/perf/Documentation/perf-kmem.txt
@@ -8,16 +8,16 @@
SYNOPSIS
--------
[verse]
-'perf kmem' {record} [<options>]
+'perf kmem' {record|stat} [<options>]
DESCRIPTION
-----------
-There's two variants of perf kmem:
+There are two variants of perf kmem:
'perf kmem record <command>' to record the kmem events
of an arbitrary workload.
- 'perf kmem' to report kernel memory statistics.
+ 'perf kmem stat' to report kernel memory statistics.
OPTIONS
-------
@@ -25,8 +25,11 @@
--input=<file>::
Select the input file (default: perf.data)
---stat=<caller|alloc>::
- Select per callsite or per allocation statistics
+--caller::
+ Show per-callsite statistics
+
+--alloc::
+ Show per-allocation statistics
-s <key[,key2...]>::
--sort=<key[,key2...]>::