Implement UST calibrate and change default

[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c

diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c
index 62816cecb89f4423970db66177e7821d025983a1..a822071400c84938a3b7c19b68f3f8cb09f626a7 100644 (file)
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -2538,3 +2538,46 @@ error:
        rcu_read_unlock();
        return -1;
 }
+
+/*
+ * Calibrate registered applications.
+ */
+int ust_app_calibrate_glb(struct lttng_ust_calibrate *calibrate)
+{
+       int ret = 0;
+       struct lttng_ht_iter iter;
+       struct ust_app *app;
+
+       rcu_read_lock();
+
+       cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, node.node) {
+               if (!app->compatible) {
+                       /*
+                        * TODO: In time, we should notice the caller of this error by
+                        * telling him that this is a version error.
+                        */
+                       continue;
+               }
+
+               ret = ustctl_calibrate(app->key.sock, calibrate);
+               if (ret < 0) {
+                       switch (ret) {
+                       case -ENOSYS:
+                               /* Means that it's not implemented on the tracer side. */
+                               ret = 0;
+                               break;
+                       default:
+                               /* TODO: Report error to user */
+                               DBG2("Calibrate app PID %d returned with error %d",
+                                               app->key.pid, ret);
+                               break;
+                       }
+               }
+       }
+
+       DBG("UST app global domain calibration finished");
+
+       rcu_read_unlock();
+
+       return ret;
+}