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    Subject[PATCH v8 05/18] 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 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
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