Perf could use many options, such as:-vv, --exec-path,
--html-path, -p, --paginate,--no-pager, --debugfs-dir,
--buildid-dir, --list-cmds, --list-opts. Add these options
in perf.txt.

Signed-off-by: Zejiang Tang <tangzeji...@loongson.cn>
---
 tools/perf/Documentation/perf.txt | 69 ++++++++++++++++++++++++++-------------
 1 file changed, 47 insertions(+), 22 deletions(-)

diff --git a/tools/perf/Documentation/perf.txt 
b/tools/perf/Documentation/perf.txt
index 3f37ded..c130a3c 100644
--- a/tools/perf/Documentation/perf.txt
+++ b/tools/perf/Documentation/perf.txt
@@ -12,32 +12,57 @@ SYNOPSIS
 
 OPTIONS
 -------
---debug::
-       Setup debug variable (see list below) in value
-       range (0, 10). Use like:
-         --debug verbose   # sets verbose = 1
-         --debug verbose=2 # sets verbose = 2
-
-       List of debug variables allowed to set:
-         verbose          - general debug messages
-         ordered-events   - ordered events object debug messages
-         data-convert     - data convert command debug messages
-         stderr           - write debug output (option -v) to stderr
-                            in browser mode
-         perf-event-open  - Print perf_event_open() arguments and
-                            return value
-
---buildid-dir::
-       Setup buildid cache directory. It has higher priority than
-       buildid.dir config file option.
+-h::
+--help::
+        Run perf help command.
 
 -v::
 --version::
-  Display perf version.
+        Display perf version.
 
--h::
---help::
-  Run perf help command.
+-vv::
+        Print the compiled-in status of libraries.
+
+--exec-path::
+        Display or set exec path.
+
+--html-path::
+        Display html documentation path.
+
+-p::
+--paginate::
+        Set up pager.
+
+--no-pager::
+        Do not set pager.
+
+--buildid-dir::
+        Setup buildid cache directory. It has higher priority
+        than buildid.dir config file option.
+
+--list-cmds::
+        List the most commonly used perf commands.
+
+--list-opts::
+        List available perf options.
+
+--debugfs-dir::
+        Set debugfs directory or set environment variable PERF_DEBUGFS_DIR.
+
+--debug::
+        Setup debug variable (see list below) in value
+        range (0, 10). Use like:
+          --debug verbose   # sets verbose = 1
+          --debug verbose=2 # sets verbose = 2
+
+        List of debug variables allowed to set:
+          verbose          - general debug messages
+          ordered-events   - ordered events object debug messages
+          data-convert     - data convert command debug messages
+          stderr           - write debug output (option -v) to stderr
+                             in browser mode
+          perf-event-open  - Print perf_event_open() arguments and
+                             return value
 
 DESCRIPTION
 -----------
-- 
2.1.0

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