core: log message when reloading finishes

Reloading might be slow, especially when under memory pressure, and watchdogs
might be triggered. It is useful to have timestamped telemetry in the journal
to see how long a reload takes.

diff --git a/src/core/main.c b/src/core/main.c
index 5469c55da73de509ba9dd3c76168d7dcdcd725f6..0bd7937f54f835fedff6c8a28ecfe5eef7a0fedb 100644 (file)
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -1973,7 +1973,7 @@ static int invoke_main_loop(
 
                         manager_send_reloading(m);
 
-                        log_info("Reloading.");
+                        log_info("Reloading...");
 
                         /* First, save any overridden log level/target, then parse the configuration file,
                          * which might change the log level to new settings. */
@@ -1998,6 +1998,9 @@ static int invoke_main_loop(
                                 /* Reloading failed before the point of no return.
                                  * Let's continue running as if nothing happened. */
                                 m->objective = MANAGER_OK;
+                        else
+                                log_info("Reloading finished in " USEC_FMT " ms.",
+                                         usec_sub_unsigned(now(CLOCK_MONOTONIC), m->timestamps[MANAGER_TIMESTAMP_UNITS_LOAD].monotonic) / USEC_PER_MSEC);
 
                         continue;
                 }