lkml.org 
[lkml]   [2020]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 07/15] perf ftrace: show trace column header
Date
This makes perf-ftrace display column header before printing trace.

$ sudo perf ftrace
\# tracer: function
\#
\# entries-in-buffer/entries-written: 0/0 #P:8
\#
\# TASK-PID CPU# TIMESTAMP FUNCTION
\# | | | | |
<...>-9246 [006] 10726.262760: mutex_unlock <-rb_simple_write
<...>-9246 [006] 10726.262764: __fsnotify_parent <-vfs_write
<...>-9246 [006] 10726.262765: fsnotify <-vfs_write
<...>-9246 [006] 10726.262766: __sb_end_write <-vfs_write
<...>-9246 [006] 10726.262767: fpregs_assert_state_consistent <-do_syscall_64

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
tools/perf/builtin-ftrace.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index e45496012611..686d744d5025 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -430,6 +430,9 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
fcntl(trace_fd, F_SETFL, O_NONBLOCK);
pollfd.fd = trace_fd;

+ /* display column headers */
+ read_tracing_file_to_stdout("trace");
+
if (!ftrace->initial_delay) {
if (write_tracing_file("tracing_on", "1") < 0) {
pr_err("can't enable tracing\n");
--
2.25.1
\
 
 \ /
  Last update: 2020-06-27 15:38    [W:1.022 / U:0.496 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site