From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
If the function-fork option exists on the machine, then it should be set if
'-c' is added to trace-cmd record. Othrewise the function tracers will not
trace the children of the process it is recording.
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
tracecmd/trace-record.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 0a3851ad..2866b776 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -128,6 +128,7 @@ static int len_filter_pids;
static int have_set_event_pid;
static int have_event_fork;
+static int have_func_fork;
struct opt_list {
struct opt_list *next;
@@ -354,6 +355,14 @@ static void test_set_event_pid(void)
}
tracefs_put_tracing_file(path);
+ path = tracefs_get_tracing_file("options/function-fork");
+ ret = stat(path, &st);
+ if (!ret) {
+ have_func_fork = 1;
+ reset_save_file(path, RESET_DEFAULT_PRIO);
+ }
+ tracefs_put_tracing_file(path);
+
tested = 1;
}
@@ -5595,6 +5604,8 @@ static void parse_record_options(int argc,
save_option("event-fork");
ctx->do_child = 1;
}
+ if (have_func_fork)
+ save_option("function-fork");
break;
case 'C':
ctx->instance->clock = optarg;
--
2.20.1
|