reset max latency

When running one of the latency tracers, reset the max latency.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/trace-cmd.c b/trace-cmd.c
index 77ce277..9e69aee 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -519,6 +519,21 @@ static void disable_all(void)
         fclose(fp);
 }
 
+static void reset_max_latency(void)
+{
+        FILE *fp;
+        char *path;
+
+        /* reset the trace */
+        path = get_tracing_file("tracing_max_latency");
+        fp = fopen(path, "w");
+        if (!fp)
+                die("writing to '%s'", path);
+        put_tracing_file(path);
+        fwrite("0", 1, 1, fp);
+        fclose(fp);
+}
+
 static void enable_events(void)
 {
         struct event_list *event;
@@ -1233,6 +1248,7 @@ int main (int argc, char **argv)
                     strcmp(plugin, "wakeup_rt") == 0) {
                         latency = 1;
                         stop_threads();
+                        reset_max_latency();
                 }
                 if (fset < 0 && (strcmp(plugin, "function") == 0 ||
                                  strcmp(plugin, "function_graph") == 0))