4 files changed, 35 insertions, 25 deletions

diff --git a/erts/emulator/beam/atom.names b/erts/emulator/beam/atom.names
index 8c51f788c0..3022c0a99a 100644
--- a/erts/emulator/beam/atom.names
+++ b/erts/emulator/beam/atom.names
@@ -273,6 +273,10 @@ atom garbage_collecting
 atom garbage_collection
 atom garbage_collection_info
 atom gc_end
+atom gc_major_end
+atom gc_major_start
+atom gc_minor_end
+atom gc_minor_start
 atom gc_start
 atom Ge='>='
 atom generational
diff --git a/erts/emulator/beam/erl_gc.c b/erts/emulator/beam/erl_gc.c
index f33ade27f3..afb2ec1cc2 100644
--- a/erts/emulator/beam/erl_gc.c
+++ b/erts/emulator/beam/erl_gc.c
@@ -593,10 +593,6 @@ garbage_collect(Process* p, ErlHeapFragment *live_hf_end,
 
     esdp = erts_get_scheduler_data();
 
-    if (IS_TRACED_FL(p, F_TRACE_GC)) {
-        trace_gc(p, am_gc_start);
-    }
-
     erts_smp_atomic32_read_bor_nob(&p->state, ERTS_PSFLG_GC);
     if (erts_system_monitor_long_gc != 0)
 	start_time = erts_get_monotonic_time(esdp);
@@ -619,18 +615,29 @@ garbage_collect(Process* p, ErlHeapFragment *live_hf_end,
      */
 
     if (GEN_GCS(p) < MAX_GEN_GCS(p) && !(FLAGS(p) & F_NEED_FULLSWEEP)) {
-	DTRACE2(gc_minor_start, pidbuf, need);
-	reds = minor_collection(p, live_hf_end, need, objv, nobj, &reclaimed_now);
-	DTRACE2(gc_minor_end, pidbuf, reclaimed_now);
-	if (reds < 0)
-	    goto do_major_collection;
-    }
-    else {
-    do_major_collection:
+        if (IS_TRACED_FL(p, F_TRACE_GC)) {
+            trace_gc(p, am_gc_minor_start, need);
+        }
+        DTRACE2(gc_minor_start, pidbuf, need);
+        reds = minor_collection(p, live_hf_end, need, objv, nobj, &reclaimed_now);
+        DTRACE2(gc_minor_end, pidbuf, reclaimed_now);
+        if (IS_TRACED_FL(p, F_TRACE_GC)) {
+            trace_gc(p, am_gc_minor_end, reclaimed_now);
+        }
+        if (reds < 0)
+            goto do_major_collection;
+    } else {
+do_major_collection:
         ERTS_MSACC_SET_STATE_CACHED_M_X(ERTS_MSACC_STATE_GC_FULL);
-	DTRACE2(gc_major_start, pidbuf, need);
-	reds = major_collection(p, live_hf_end, need, objv, nobj, &reclaimed_now);
-	DTRACE2(gc_major_end, pidbuf, reclaimed_now);
+        if (IS_TRACED_FL(p, F_TRACE_GC)) {
+            trace_gc(p, am_gc_major_start, need);
+        }
+        DTRACE2(gc_major_start, pidbuf, need);
+        reds = major_collection(p, live_hf_end, need, objv, nobj, &reclaimed_now);
+        DTRACE2(gc_major_end, pidbuf, reclaimed_now);
+        if (IS_TRACED_FL(p, F_TRACE_GC)) {
+            trace_gc(p, am_gc_major_end, reclaimed_now);
+        }
         ERTS_MSACC_SET_STATE_CACHED_M_X(ERTS_MSACC_STATE_GC);
     }
 
@@ -646,10 +653,6 @@ garbage_collect(Process* p, ErlHeapFragment *live_hf_end,
 
     erts_smp_atomic32_read_band_nob(&p->state, ~ERTS_PSFLG_GC);
 
-    if (IS_TRACED_FL(p, F_TRACE_GC)) {
-        trace_gc(p, am_gc_end);
-    }
-
     if (erts_system_monitor_long_gc != 0) {
 	ErtsMonotonicTime end_time;
 	Uint gc_time;
diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c
index 0842c0c0a4..9146cc7c7f 100644
--- a/erts/emulator/beam/erl_trace.c
+++ b/erts/emulator/beam/erl_trace.c
@@ -1326,23 +1326,26 @@ void save_calls(Process *p, Export *e)
  * are all small (atomic) integers.
  */
 void
-trace_gc(Process *p, Eterm what)
+trace_gc(Process *p, Eterm what, Uint size)
 {
     ErtsTracerNif *tnif = NULL;
     Eterm* hp;
     Eterm msg = NIL;
-    Uint size = 0;
+    Uint sz = 0;
+    Eterm tup;
 
     if (is_tracer_proc_enabled(
             p, ERTS_PROC_LOCK_MAIN, &p->common, &tnif, what)) {
 
-        (void) erts_process_gc_info(p, &size, NULL);
-        hp = HAlloc(p, size);
+        (void) erts_process_gc_info(p, &sz, NULL);
+        hp = HAlloc(p, sz + 3 + 2);
 
         msg = erts_process_gc_info(p, NULL, &hp);
+	tup = TUPLE2(hp, am_wordsize, make_small(size)); hp += 3;
+        msg = CONS(hp, tup, msg); hp += 2;
 
         send_to_tracer_nif(p, &p->common, p->common.id, tnif, TRACE_FUN_GC,
-                what, msg, THE_NON_VALUE);
+                what, msg, am_undefined);
     }
 }
 
diff --git a/erts/emulator/beam/erl_trace.h b/erts/emulator/beam/erl_trace.h
index 177fd373a6..9a007e62ec 100644
--- a/erts/emulator/beam/erl_trace.h
+++ b/erts/emulator/beam/erl_trace.h
@@ -103,7 +103,7 @@ void trace_sched(Process*, ErtsProcLocks, Eterm);
 void trace_proc(Process*, ErtsProcLocks, Process*, Eterm, Eterm);
 void trace_proc_spawn(Process*, Eterm what, Eterm pid, Eterm mod, Eterm func, Eterm args);
 void save_calls(Process *p, Export *);
-void trace_gc(Process *p, Eterm what);
+void trace_gc(Process *p, Eterm what, Uint size);
 /* port tracing */
 void trace_virtual_sched(Process*, ErtsProcLocks, Eterm);
 void trace_sched_ports(Port *pp, Eterm);