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, 12 insertions, 0 deletions

diff --git a/rts/sm/GC.c b/rts/sm/GC.c
index 0dc92a29a0..0edc5f72ca 100644
--- a/rts/sm/GC.c
+++ b/rts/sm/GC.c
@@ -38,6 +38,7 @@
 #include "Sanity.h"
 #include "BlockAlloc.h"
 #include "ProfHeap.h"
+#include "Proftimer.h"
 #include "Weak.h"
 #include "Prelude.h"
 #include "RtsSignals.h"
@@ -52,6 +53,7 @@
 #include "CNF.h"
 #include "RtsFlags.h"
 #include "NonMoving.h"
+#include "Ticky.h"
 
 #include <string.h> // for memset()
 #include <unistd.h>
@@ -903,6 +905,16 @@ GarbageCollect (uint32_t collect_gen,
       ACQUIRE_SM_LOCK;
   }
 
+#if defined(TICKY_TICKY)
+  // Post ticky counter sample.
+  // We do this at the end of execution since tickers are registered in the
+  // course of program execution.
+  if (performTickySample) {
+      emitTickyCounterSamples();
+      performTickySample = false;
+  }
+#endif
+
   // send exceptions to any threads which were about to die
   RELEASE_SM_LOCK;
   resurrectThreads(resurrected_threads);