rts: Post ticky entry counts to the eventlog

We currently only post the entry counters, not the other global
counters as in my experience the former are more useful. We use the heap
profiler's census period to decide when to dump.

Also spruces up the documentation surrounding ticky-ticky a bit.

1 files changed, 16 insertions, 0 deletions

diff --git a/rts/Proftimer.c b/rts/Proftimer.c
index 24f82ead6d..00b92a227d 100644
--- a/rts/Proftimer.c
+++ b/rts/Proftimer.c
@@ -20,6 +20,12 @@ static bool do_prof_ticks = false;       // enable profiling ticks
 
 static bool do_heap_prof_ticks = false;  // enable heap profiling ticks
 
+// Sampling of Ticky-Ticky profiler to eventlog
+#if defined(TICKY_TICKY) && defined(TRACING)
+static int ticks_to_ticky_sample = 0;
+bool performTickySample = false;
+#endif
+
 // Number of ticks until next heap census
 static int ticks_to_heap_profile;
 
@@ -83,6 +89,16 @@ handleProfTick(void)
     }
 #endif
 
+#if defined(TICKY_TICKY) && defined(TRACING)
+    if (RtsFlags.TraceFlags.ticky) {
+        ticks_to_ticky_sample--;
+        if (ticks_to_ticky_sample <= 0) {
+            ticks_to_ticky_sample = RtsFlags.ProfFlags.heapProfileIntervalTicks;
+            performTickySample = true;
+        }
+    }
+#endif
+
     if (RELAXED_LOAD(&do_heap_prof_ticks)) {
         ticks_to_heap_profile--;
         if (ticks_to_heap_profile <= 0) {