Add new GC.stat counters

Author: luke-gruber

gc/default/default.c

@@ -593,6 +593,8 @@ typedef struct rb_objspace {
         double invoke_time;
 
         size_t minor_gc_count;
+        size_t minor_gc_count_by_newobj;
+        size_t minor_gc_count_by_malloc;
         size_t major_gc_count;
         size_t compact_count;
         size_t read_barrier_faults;
@@ -6505,6 +6507,9 @@ gc_start(rb_objspace_t *objspace, unsigned int reason)
     else {
         (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_newobj, reason & GPR_FLAG_NEWOBJ);
         (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_malloc, reason & GPR_FLAG_MALLOC);
+
+        if (reason & GPR_FLAG_NEWOBJ) objspace->profile.minor_gc_count_by_newobj++;
+        if (reason & GPR_FLAG_MALLOC) objspace->profile.minor_gc_count_by_malloc++;
         (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_method, reason & GPR_FLAG_METHOD);
         (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_capi,   reason & GPR_FLAG_CAPI);
         (void)RB_DEBUG_COUNTER_INC_IF(gc_minor_stress, reason & GPR_FLAG_STRESS);
@@ -7478,6 +7483,8 @@ enum gc_stat_sym {
     gc_stat_sym_malloc_increase_bytes,
     gc_stat_sym_malloc_increase_bytes_limit,
     gc_stat_sym_minor_gc_count,
+    gc_stat_sym_minor_gc_count_by_newobj,
+    gc_stat_sym_minor_gc_count_by_malloc,
     gc_stat_sym_major_gc_count,
     gc_stat_sym_compact_count,
     gc_stat_sym_read_barrier_faults,
@@ -7528,6 +7535,8 @@ setup_gc_stat_symbols(void)
         S(malloc_increase_bytes);
         S(malloc_increase_bytes_limit);
         S(minor_gc_count);
+        S(minor_gc_count_by_newobj);
+        S(minor_gc_count_by_malloc);
         S(major_gc_count);
         S(compact_count);
         S(read_barrier_faults);
@@ -7609,6 +7618,8 @@ rb_gc_impl_stat(void *objspace_ptr, VALUE hash_or_sym)
     SET(malloc_increase_bytes, malloc_increase);
     SET(malloc_increase_bytes_limit, malloc_limit);
     SET(minor_gc_count, objspace->profile.minor_gc_count);
+    SET(minor_gc_count_by_newobj, objspace->profile.minor_gc_count_by_newobj);
+    SET(minor_gc_count_by_malloc, objspace->profile.minor_gc_count_by_malloc);
     SET(major_gc_count, objspace->profile.major_gc_count);
     SET(compact_count, objspace->profile.compact_count);
     SET(read_barrier_faults, objspace->profile.read_barrier_faults);