Merge branch 'bug4518' into maint-0.2.2

changes/bug4518

@@ -0,0 +1,4 @@
+  o Minor bugfixes (performance):
+    - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
+      function. This was eating up hideously large amounts of time on some
+      busy servers. Fixes bug 4518.

src/or/cpuworker.c

@@ -446,9 +446,19 @@ assign_onionskin_to_cpuworker(connection_t *cpuworker,
 {
   char qbuf[1];
   char tag[TAG_LEN];
+  time_t now = approx_time();
+  static time_t last_culled_cpuworkers = 0;
 
+  /* Checking for wedged cpuworkers requires a linear search over all
+   * connections, so let's do it only once a minute.
+   */
+#define CULL_CPUWORKERS_INTERVAL 60
+
+  if (last_culled_cpuworkers + CULL_CPUWORKERS_INTERVAL <= now) {
     cull_wedged_cpuworkers();
     spawn_enough_cpuworkers();
+    last_culled_cpuworkers = now;
+  }
 
   if (1) {
     if (num_cpuworkers_busy == num_cpuworkers) {