Messages in this thread | | | Date | Wed, 20 May 2020 18:11:01 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 15/19] perf ftrace: show trace column header |
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Em Sun, May 10, 2020 at 11:06:24PM +0800, Changbin Du escreveu: > This makes perf-ftrace display column header before printing trace.
[acme@five perf]$ perf report -h header
Usage: perf report [<options>]
--header Show data header. --header-only Show only data header.
[acme@five perf]$
Perhaps there is value in --header-only to show the default that will be setup when using some set of options.
- Arnaldo
> $ 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 64c22f367ba2..0b39b6a88026 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -614,6 +614,9 @@ 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 (write_tracing_file("tracing_on", "1") < 0) { > pr_err("can't enable tracing\n"); > goto out_close_fd; > -- > 2.25.1 >
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- Arnaldo
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