linux-kernel - [PATCH v2 13/15] perf ftrace: add option '--graph-verbose' to show more info for graph tracer

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Message-Id: <20200627133654.64863-14-changbin.du@gmail.com>
Date:   Sat, 27 Jun 2020 21:36:52 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...il.com>
Subject: [PATCH v2 13/15] perf ftrace: add option '--graph-verbose' to show more info for graph tracer

Sometimes we want ftrace display more and longer information about the trace.

$ sudo perf ftrace -G
 2)   0.979 us    |  mutex_unlock();
 2)   1.540 us    |  __fsnotify_parent();
 2)   0.433 us    |  fsnotify();

$ sudo perf ftrace -G --graph-verbose
14160.770883 |   0)  <...>-47814   |  .... |   1.289 us    |  mutex_unlock();
14160.770886 |   0)  <...>-47814   |  .... |   1.624 us    |  __fsnotify_parent();
14160.770887 |   0)  <...>-47814   |  .... |   0.636 us    |  fsnotify();
14160.770888 |   0)  <...>-47814   |  .... |   0.328 us    |  __sb_end_write();
14160.770888 |   0)  <...>-47814   |  d... |   0.430 us    |  fpregs_assert_state_consistent();
14160.770889 |   0)  <...>-47814   |  d... |               |  do_syscall_64() {
14160.770889 |   0)  <...>-47814   |  .... |               |    __x64_sys_close() {

Signed-off-by: Changbin Du <changbin.du@...il.com>
---
 tools/perf/Documentation/perf-ftrace.txt |  3 +++
 tools/perf/builtin-ftrace.c              | 28 ++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index 3c9eb044b7eb..cc770fc0a1e8 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -113,6 +113,9 @@ OPTIONS
 --graph-noirqs::
 	Ignore functions that happen inside interrupt for function_graph tracer.
 
+--graph-verbose::
+	Show process names, PIDs, timestamps for function_graph tracer.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-trace[1]
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 0a1e481b66a0..e037fe7abd47 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -45,6 +45,7 @@ struct perf_ftrace {
 	bool			func_irq_info;
 	bool			graph_nosleep_time;
 	bool			graph_noirqs;
+	bool			graph_verbose;
 };
 
 struct filter_entry {
@@ -205,6 +206,9 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
 	write_tracing_option_file("func_stack_trace", "0");
 	write_tracing_option_file("sleep-time", "1");
 	write_tracing_option_file("funcgraph-irqs", "1");
+	write_tracing_option_file("funcgraph-proc", "0");
+	write_tracing_option_file("funcgraph-abstime", "0");
+	write_tracing_option_file("latency-format", "0");
 	write_tracing_option_file("irq-info", "0");
 }
 
@@ -419,6 +423,23 @@ static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
 	return 0;
 }
 
+static int set_tracing_funcgraph_verbose(struct perf_ftrace *ftrace)
+{
+	if (!ftrace->graph_verbose)
+		return 0;
+
+	if (write_tracing_option_file("funcgraph-proc", "1") < 0)
+		return -1;
+
+	if (write_tracing_option_file("funcgraph-abstime", "1") < 0)
+		return -1;
+
+	if (write_tracing_option_file("latency-format", "1") < 0)
+		return -1;
+
+	return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 {
 	char *trace_file;
@@ -513,6 +534,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		goto out_reset;
 	}
 
+	if (set_tracing_funcgraph_verbose(ftrace) < 0) {
+		pr_err("failed to set tracing option funcgraph-proc/funcgraph-abstime\n");
+		goto out_reset;
+	}
+
 	if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
 		pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
 		goto out_reset;
@@ -698,6 +724,8 @@ int cmd_ftrace(int argc, const char **argv)
 		    "measure on-CPU time only for function_graph tracer"),
 	OPT_BOOLEAN(0, "graph-noirqs", &ftrace.graph_noirqs,
 		    "ignore functions that happen inside interrupt for function_graph tracer"),
+	OPT_BOOLEAN(0, "graph-verbose", &ftrace.graph_verbose,
+		    "show process names, PIDs, timestamps for function_graph tracer"),
 	OPT_END()
 	};
 
-- 
2.25.1