[PATCH 10/19] perf ftrace: add support for trace option funcgraph-tail

[Changbin Du]

This adds an option '--funcgraph-tail' for function graph tracer.

Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
---
 tools/perf/builtin-ftrace.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 20bc14d6c5fb..2ef5d1c4b23c 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -42,6 +42,7 @@ struct perf_ftrace {
 	bool			func_stack_trace;
 	bool			nosleep_time;
 	bool			nofuncgraph_irqs;
+	bool			funcgraph_tail;
 	bool			long_info;
 	unsigned		tracing_thresh;
 };
@@ -192,6 +193,7 @@ 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-tail", "0");
 	write_tracing_option_file("funcgraph-proc", "0");
 	write_tracing_option_file("funcgraph-abstime", "0");
 	write_tracing_option_file("irq-info", "0");
@@ -411,6 +413,17 @@ static int set_tracing_thresh(struct perf_ftrace *ftrace)
 	return 0;
 }
 
+static int set_tracing_funcgraph_tail(struct perf_ftrace *ftrace)
+{
+	if (!ftrace->funcgraph_tail)
+		return 0;
+
+	if (write_tracing_option_file("funcgraph-tail", "1") < 0)
+		return -1;
+
+	return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 {
 	char *trace_file;
@@ -499,6 +512,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		goto out_reset;
 	}
 
+	if (set_tracing_funcgraph_tail(ftrace) < 0) {
+		pr_err("failed to set tracing option funcgraph-tail\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;
@@ -638,6 +656,8 @@ int cmd_ftrace(int argc, const char **argv)
 		    "Measure on-CPU time only (function_graph only)"),
 	OPT_BOOLEAN(0, "nofuncgraph-irqs", &ftrace.nofuncgraph_irqs,
 		    "Ignore functions that happen inside interrupt (function_graph only)"),
+	OPT_BOOLEAN(0, "funcgraph-tail", &ftrace.funcgraph_tail,
+		    "Show function tails comment (function_graph only)"),
 	OPT_BOOLEAN('l', "long-info", &ftrace.long_info,
 		    "Show process names, PIDs, timestamps, irq-info if available"),
 	OPT_UINTEGER(0, "tracing-thresh", &ftrace.tracing_thresh,
-- 
2.25.1