Add heap_size and work_to_do

Author: sergey-miryanov

Include/internal/pycore_interp_structs.h

@@ -195,7 +195,11 @@ struct gc_generation_stats {
     Py_ssize_t objects_transitively_reachable;
     Py_ssize_t objects_not_transitively_reachable;
 
+    Py_ssize_t heap_size;
+    Py_ssize_t work_to_do;
+
     double duration;
+    double total_duration;
 };
 
 struct gc_generation_stats_buffer {

Python/gc.c

@@ -1422,7 +1422,10 @@ add_stats(GCState *gcstate, int gen, struct gc_generation_stats *stats)
     cur_stats->objects_not_transitively_reachable = prev_stats->objects_not_transitively_reachable + stats->objects_not_transitively_reachable;
     cur_stats->uncollectable = prev_stats->uncollectable + stats->uncollectable;
     cur_stats->candidates = prev_stats->candidates + stats->candidates;
-    cur_stats->duration = prev_stats->duration + stats->duration;
+    cur_stats->duration = stats->duration;
+    cur_stats->total_duration = prev_stats->total_duration + stats->duration;
+    cur_stats->heap_size = gcstate->heap_size;
+    cur_stats->work_to_do = gcstate->work_to_do;
 }
 
 static void