288 
 289   assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity");
 290   assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity");
 291 
 292   // Fill in TLABs
 293   heap->accumulate_statistics_all_tlabs();
 294   heap->ensure_parsability(true);  // retire TLABs
 295 
 296   if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) {
 297     HandleMark hm;  // Discard invalid handles created during verification
 298     Universe::verify("Before GC");
 299   }
 300 
 301   {
 302     ResourceMark rm;
 303     HandleMark hm;
 304 
 305     GCTraceCPUTime tcpu;
 306     GCTraceTime(Info, gc) tm("Pause Young", NULL, gc_cause, true);
 307     TraceCollectorStats tcs(counters());
 308     TraceMemoryManagerStats tms(heap->young_gc_mgr(), gc_cause);
 309 
 310     if (log_is_enabled(Debug, gc, heap, exit)) {
 311       accumulated_time()->start();
 312     }
 313 
 314     // Let the size policy know we're starting
 315     size_policy->minor_collection_begin();
 316 
 317     // Verify the object start arrays.
 318     if (VerifyObjectStartArray &&
 319         VerifyBeforeGC) {
 320       old_gen->verify_object_start_array();
 321     }
 322 
 323     // Verify no unmarked old->young roots
 324     if (VerifyRememberedSets) {
 325       CardTableExtension::verify_all_young_refs_imprecise();
 326     }
 327 
 328     assert(young_gen->to_space()->is_empty(),

 288 
 289   assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity");
 290   assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity");
 291 
 292   // Fill in TLABs
 293   heap->accumulate_statistics_all_tlabs();
 294   heap->ensure_parsability(true);  // retire TLABs
 295 
 296   if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) {
 297     HandleMark hm;  // Discard invalid handles created during verification
 298     Universe::verify("Before GC");
 299   }
 300 
 301   {
 302     ResourceMark rm;
 303     HandleMark hm;
 304 
 305     GCTraceCPUTime tcpu;
 306     GCTraceTime(Info, gc) tm("Pause Young", NULL, gc_cause, true);
 307     TraceCollectorStats tcs(counters());
 308     TraceMemoryManagerStats tms(heap->young_gc_manager(), gc_cause);
 309 
 310     if (log_is_enabled(Debug, gc, heap, exit)) {
 311       accumulated_time()->start();
 312     }
 313 
 314     // Let the size policy know we're starting
 315     size_policy->minor_collection_begin();
 316 
 317     // Verify the object start arrays.
 318     if (VerifyObjectStartArray &&
 319         VerifyBeforeGC) {
 320       old_gen->verify_object_start_array();
 321     }
 322 
 323     // Verify no unmarked old->young roots
 324     if (VerifyRememberedSets) {
 325       CardTableExtension::verify_all_young_refs_imprecise();
 326     }
 327 
 328     assert(young_gen->to_space()->is_empty(),