--- a/src/hotspot/share/gc/g1/g1HeapVerifier.cpp	Fri Dec 01 11:40:39 2017 +0530
+++ b/src/hotspot/share/gc/g1/g1HeapVerifier.cpp	Fri Dec 01 08:56:22 2017 +0100
@@ -376,6 +376,37 @@
   }
 };
 
+void G1HeapVerifier::parse_verification_type(const char* type) {
+  if (strcmp(type, "young-only") == 0) {
+    enable_verification_type(G1VerifyYoungOnly);
+  } else if (strcmp(type, "initial-mark") == 0) {
+    enable_verification_type(G1VerifyInitialMark);
+  } else if (strcmp(type, "mixed") == 0) {
+    enable_verification_type(G1VerifyMixed);
+  } else if (strcmp(type, "remark") == 0) {
+    enable_verification_type(G1VerifyRemark);
+  } else if (strcmp(type, "cleanup") == 0) {
+    enable_verification_type(G1VerifyCleanup);
+  } else if (strcmp(type, "full") == 0) {
+    enable_verification_type(G1VerifyFull);
+  } else {
+    log_warning(gc, verify)("VerifyGCType: '%s' is unknown. Available types are: "
+                            "young-only, initial-mark, mixed, remark, cleanup and full", type);
+  }
+}
+
+void G1HeapVerifier::enable_verification_type(G1VerifyType type) {
+  // First enable will clear _enabled_verification_types.
+  if (_enabled_verification_types == G1VerifyAll) {
+    _enabled_verification_types = type;
+  } else {
+    _enabled_verification_types |= type;
+  }
+}
+
+bool G1HeapVerifier::should_verify(G1VerifyType type) {
+  return (_enabled_verification_types & type) == type;
+}
 
 void G1HeapVerifier::verify(VerifyOption vo) {
   if (!SafepointSynchronize::is_at_safepoint()) {
@@ -541,28 +572,32 @@
   }
 }
 
-double G1HeapVerifier::verify(bool guard, const char* msg) {
+double G1HeapVerifier::verify(G1VerifyType type, VerifyOption vo, const char* msg) {
   double verify_time_ms = 0.0;
 
-  if (guard && _g1h->total_collections() >= VerifyGCStartAt) {
+  if (should_verify(type) && _g1h->total_collections() >= VerifyGCStartAt) {
     double verify_start = os::elapsedTime();
     HandleMark hm;  // Discard invalid handles created during verification
     prepare_for_verify();
-    Universe::verify(VerifyOption_G1UsePrevMarking, msg);
+    Universe::verify(vo, msg);
     verify_time_ms = (os::elapsedTime() - verify_start) * 1000;
   }
 
   return verify_time_ms;
 }
 
-void G1HeapVerifier::verify_before_gc() {
-  double verify_time_ms = verify(VerifyBeforeGC, "Before GC");
-  _g1h->g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
+void G1HeapVerifier::verify_before_gc(G1VerifyType type) {
+  if (VerifyBeforeGC) {
+    double verify_time_ms = verify(type, VerifyOption_G1UsePrevMarking, "Before GC");
+    _g1h->g1_policy()->phase_times()->record_verify_before_time_ms(verify_time_ms);
+  }
 }
 
-void G1HeapVerifier::verify_after_gc() {
-  double verify_time_ms = verify(VerifyAfterGC, "After GC");
-  _g1h->g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
+void G1HeapVerifier::verify_after_gc(G1VerifyType type) {
+  if (VerifyAfterGC) {
+    double verify_time_ms = verify(type, VerifyOption_G1UsePrevMarking, "After GC");
+    _g1h->g1_policy()->phase_times()->record_verify_after_time_ms(verify_time_ms);
+  }
 }