perf ftrace: Select function/function_graph tracer automatically

[linux-2.6-microblaze.git] / tools / perf / builtin-ftrace.c

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 2bfc1b0..048a111 100644 (file)
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -455,6 +455,23 @@ static void delete_filter_func(struct list_head *head)
        }
 }
 
+static void select_tracer(struct perf_ftrace *ftrace)
+{
+       bool graph = !list_empty(&ftrace->graph_funcs) ||
+                    !list_empty(&ftrace->nograph_funcs);
+       bool func = !list_empty(&ftrace->filters) ||
+                   !list_empty(&ftrace->notrace);
+
+       /* The function_graph has priority over function tracer. */
+       if (graph)
+               ftrace->tracer = "function_graph";
+       else if (func)
+               ftrace->tracer = "function";
+       /* Otherwise, the default tracer is used. */
+
+       pr_debug("%s tracer is used\n", ftrace->tracer);
+}
+
 int cmd_ftrace(int argc, const char **argv)
 {
        int ret;
@@ -479,11 +496,13 @@ int cmd_ftrace(int argc, const char **argv)
        OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
                    "list of cpus to monitor"),
        OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func",
-                    "trace given functions only", parse_filter_func),
+                    "trace given functions using function tracer",
+                    parse_filter_func),
        OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
                     "do not trace given functions", parse_filter_func),
        OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
-                    "Set graph filter on given functions", parse_filter_func),
+                    "trace given functions using function_graph tracer",
+                    parse_filter_func),
        OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
                     "Set nograph filter on given functions", parse_filter_func),
        OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
@@ -505,6 +524,8 @@ int cmd_ftrace(int argc, const char **argv)
        if (!argc && target__none(&ftrace.target))
                ftrace.target.system_wide = true;
 
+       select_tracer(&ftrace);
+
        ret = target__validate(&ftrace.target);
        if (ret) {
                char errbuf[512];