netdev - [PATCH v4 bpf-next 2/4] bpftool: Documentation for bpftool prog profile

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Message-ID: <20200304180710.2677695-3-songliubraving@fb.com>
Date:   Wed, 4 Mar 2020 10:07:08 -0800
From:   Song Liu <songliubraving@...com>
To:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <quentin@...valent.com>, <kernel-team@...com>, <ast@...nel.org>,
        <daniel@...earbox.net>, <arnaldo.melo@...il.com>,
        <jolsa@...nel.org>, Song Liu <songliubraving@...com>
Subject: [PATCH v4 bpf-next 2/4] bpftool: Documentation for bpftool prog profile

Add documentation for the new bpftool prog profile command.

Reviewed-by: Quentin Monnet <quentin@...valent.com>
Signed-off-by: Song Liu <songliubraving@...com>
---
 .../bpftool/Documentation/bpftool-prog.rst    | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 46862e85fed2..9f19404f470e 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -30,6 +30,7 @@ PROG COMMANDS
 |	**bpftool** **prog detach** *PROG* *ATTACH_TYPE* [*MAP*]
 |	**bpftool** **prog tracelog**
 |	**bpftool** **prog run** *PROG* **data_in** *FILE* [**data_out** *FILE* [**data_size_out** *L*]] [**ctx_in** *FILE* [**ctx_out** *FILE* [**ctx_size_out** *M*]]] [**repeat** *N*]
+|	**bpftool** **prog profile** *PROG* [**duration** *DURATION*] *METRICs*
 |	**bpftool** **prog help**
 |
 |	*MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
@@ -48,6 +49,9 @@ PROG COMMANDS
 |       *ATTACH_TYPE* := {
 |		**msg_verdict** | **stream_verdict** | **stream_parser** | **flow_dissector**
 |	}
+|	*METRIC* := {
+|		**cycles** | **instructions** | **l1d_loads** | **llc_misses**
+|	}
 
 
 DESCRIPTION
@@ -189,6 +193,12 @@ DESCRIPTION
 		  not all of them can take the **ctx_in**/**ctx_out**
 		  arguments. bpftool does not perform checks on program types.
 
+	**bpftool prog profile** *PROG* [**duration** *DURATION*] *METRICs*
+		  Profile *METRICs* for bpf program *PROG* for *DURATION*
+		  seconds or until user hits Ctrl-C. *DURATION* is optional.
+		  If *DURATION* is not specified, the profiling will run up to
+		  UINT_MAX seconds.
+
 	**bpftool prog help**
 		  Print short help message.
 
@@ -311,6 +321,15 @@ EXAMPLES
 
 **# rm /sys/fs/bpf/xdp1**
 
+|
+| **# bpftool prog profile id 337 duration 10 cycles instructions llc_misses**
+
+::
+         51397 run_cnt
+      40176203 cycles                                                 (83.05%)
+      42518139 instructions    #   1.06 insns per cycle               (83.39%)
+           123 llc_misses      #   2.89 LLC misses per million insns  (83.15%)
+
 SEE ALSO
 ========
 	**bpf**\ (2),
-- 
2.17.1