Messages in this thread | | | Date | Fri, 14 Aug 2020 08:56:55 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v8 05/18] perf ftrace: show trace column header |
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Em Sat, Aug 08, 2020 at 10:31:28AM +0800, Changbin Du escreveu: > 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
We have:
# perf report -h header
Usage: perf report [<options>]
--header Show data header. --header-only Show only data header.
#
So perhaps we should have those as well, in the 'ftrace' case one would perhaps want to use --no-header, for instance, to do some scripting parsing just the trace lines.
- Arnaldo
> 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 a3a4f4be9dde..39c694be2b71 100644 > --- a/tools/perf/builtin-ftrace.c > +++ b/tools/perf/builtin-ftrace.c > @@ -435,6 +435,9 @@ 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 >
--
- Arnaldo
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