flow-manager: call other timeouts max once a second

Call Defrag and others only once per second. Flow Manager may wake
up (much) more often when flow engine is under resource pressure.
As this does not affect Defrag and others, it only unnecessarily
adds load.

src/flow-manager.c

@@ -693,6 +693,7 @@ static TmEcode FlowManager(ThreadVars *th_v, void *thread_data)
     struct timespec cond_time;
     int flow_update_delay_sec = FLOW_NORMAL_MODE_UPDATE_DELAY_SEC;
     int flow_update_delay_nsec = FLOW_NORMAL_MODE_UPDATE_DELAY_NSEC;
+    uint32_t other_last_sec = 0; /**< last sec stamp when defrag etc ran */
 /* VJ leaving disabled for now, as hosts are only used by tags and the numbers
  * are really low. Might confuse ppl
     uint16_t flow_mgr_host_prune = StatsRegisterCounter("hosts.pruned", th_v);
@@ -741,11 +742,13 @@ static TmEcode FlowManager(ThreadVars *th_v, void *thread_data)
         FlowTimeoutHash(&ts, 0 /* check all */, ftd->min, ftd->max, &counters);
 
 
-        if (ftd->instance == 0) {
+        if (ftd->instance == 0 &&
+                (other_last_sec == 0 || other_last_sec < (uint32_t)ts.tv_sec)) {
             DefragTimeoutHash(&ts);
             //uint32_t hosts_pruned =
             HostTimeoutHash(&ts);
             IPPairTimeoutHash(&ts);
+            other_last_sec = (uint32_t)ts.tv_sec;
         }
 /*
         StatsAddUI64(th_v, flow_mgr_host_prune, (uint64_t)hosts_pruned);