implement exponential back-off cool down for ARM process restarts

diff --git a/src/arm/gnunet-service-arm.c b/src/arm/gnunet-service-arm.c
index 19088c5cb7ec57bd526ead12252651986169bba1..2db2ba0d1773ef88d680e09c4c69cef1a74101d0 100644 (file)
--- a/src/arm/gnunet-service-arm.c
+++ b/src/arm/gnunet-service-arm.c
@@ -1833,7 +1833,21 @@ maint_child_death (void *cls)
                    statcode,
                    GNUNET_STRINGS_relative_time_to_string (pos->backoff,
                                                            GNUNET_YES));
-        /* schedule restart */
+       {
+         /* Reduce backoff based on runtime of the process,
+            so that there is a cool-down if a process actually
+            runs for a while. */
+         struct GNUNET_TIME_Relative runtime;
+         unsigned int minutes;
+
+         runtime = GNUNET_TIME_absolute_get_duration (pos->restart_at);
+         minutes = runtime.rel_value_us / GNUNET_TIME_UNIT_MINUTES.rel_value_us;
+         if (minutes > 31)
+           pos->backoff = GNUNET_TIME_UNIT_ZERO;
+         else
+           pos->backoff.rel_value_us <<= minutes;
+       }
+       /* schedule restart */
         pos->restart_at = GNUNET_TIME_relative_to_absolute (pos->backoff);
         pos->backoff = GNUNET_TIME_STD_BACKOFF (pos->backoff);
         if (NULL != child_restart_task)