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Sat, 27 Jun 2020 06:38:11 -0700 (PDT) From: Changbin Du To: Jiri Olsa , Arnaldo Carvalho de Melo Cc: Peter Zijlstra , Ingo Molnar , Namhyung Kim , Steven Rostedt , linux-kernel@vger.kernel.org, Changbin Du Subject: [PATCH v2 07/15] perf ftrace: show trace column header Date: Sat, 27 Jun 2020 21:36:46 +0800 Message-Id: <20200627133654.64863-8-changbin.du@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200627133654.64863-1-changbin.du@gmail.com> References: <20200627133654.64863-1-changbin.du@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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