[PATCH v2 08/15] perf ftrace: add option '--inherit' to trace children processes

[Changbin Du]

This adds an option '--inherit' to allow us trace children
processes spawned by our target.

Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>

---
v2: option name '--trace-children' -> '--inherit'.
---
 tools/perf/Documentation/perf-ftrace.txt |  3 ++
 tools/perf/builtin-ftrace.c              | 38 ++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index a18d640e90bb..66876e79cc24 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -64,6 +64,9 @@ OPTIONS
 --buffer-size::
 	Set the size of per-cpu tracing buffer in KB.
 
+--inherit::
+	Trace children processes spawned by our target.
+
 -T::
 --trace-funcs=::
 	Only trace functions given by the argument.  Multiple functions
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 686d744d5025..b2651b9bd6d0 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -40,6 +40,7 @@ struct perf_ftrace {
 	int			graph_depth;
 	unsigned		initial_delay;
 	unsigned		buffer_size_kb;
+	bool			inherit;
 };
 
 struct filter_entry {
@@ -178,9 +179,27 @@ static int write_tracing_file_int(const char *name, int value)
 	return 0;
 }
 
+static int write_tracing_option_file(const char *name, const char *val)
+{
+	char *file;
+	int ret;
+
+	if (asprintf(&file, "options/%s", name) < 0)
+		return -1;
+
+	ret = __write_tracing_file(file, val, false);
+	free(file);
+	return ret;
+}
+
 static int reset_tracing_cpu(void);
 static void reset_tracing_filters(void);
 
+static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
+{
+	write_tracing_option_file("function-fork", "0");
+}
+
 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
 {
 	if (write_tracing_file("tracing_on", "0") < 0)
@@ -199,6 +218,7 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
 		return -1;
 
 	reset_tracing_filters();
+	reset_tracing_options(ftrace);
 	return 0;
 }
 
@@ -336,6 +356,17 @@ static int set_tracing_buffer_size_kb(struct perf_ftrace *ftrace)
 	return 0;
 }
 
+static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
+{
+	if (!ftrace->inherit)
+		return 0;
+
+	if (write_tracing_option_file("function-fork", "1") < 0)
+		return -1;
+
+	return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 {
 	char *trace_file;
@@ -405,6 +436,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		goto out_reset;
 	}
 
+	if (set_tracing_trace_inherit(ftrace) < 0) {
+		pr_err("failed to set tracing option function-fork\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;
@@ -580,6 +616,8 @@ int cmd_ftrace(int argc, const char **argv)
 		     "ms to wait before starting tracing after program start"),
 	OPT_UINTEGER('m', "buffer-size", &ftrace.buffer_size_kb,
 		     "size of per cpu buffer in kb"),
+	OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
+		    "trace children processes"),
 	OPT_END()
 	};
 
-- 
2.25.1