308 
 309   size_t prev_used = heap->used();
 310   assert(promotion_failed() == false, "Sanity");
 311 
 312   // Fill in TLABs
 313   heap->accumulate_statistics_all_tlabs();
 314   heap->ensure_parsability(true);  // retire TLABs
 315 
 316   if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) {
 317     HandleMark hm;  // Discard invalid handles created during verification
 318     gclog_or_tty->print(" VerifyBeforeGC:");
 319     Universe::verify(true);
 320   }
 321 
 322   {
 323     ResourceMark rm;
 324     HandleMark hm;
 325 
 326     gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
 327     TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
 328     TraceTime t1("GC", PrintGC, !PrintGCDetails, gclog_or_tty);
 329     TraceCollectorStats tcs(counters());
 330     TraceMemoryManagerStats tms(false /* not full GC */,gc_cause);
 331 
 332     if (TraceGen0Time) accumulated_time()->start();
 333 
 334     // Let the size policy know we're starting
 335     size_policy->minor_collection_begin();
 336 
 337     // Verify the object start arrays.
 338     if (VerifyObjectStartArray &&
 339         VerifyBeforeGC) {
 340       old_gen->verify_object_start_array();
 341       perm_gen->verify_object_start_array();
 342     }
 343 
 344     // Verify no unmarked old->young roots
 345     if (VerifyRememberedSets) {
 346       CardTableExtension::verify_all_young_refs_imprecise();
 347     }
 348 

 308 
 309   size_t prev_used = heap->used();
 310   assert(promotion_failed() == false, "Sanity");
 311 
 312   // Fill in TLABs
 313   heap->accumulate_statistics_all_tlabs();
 314   heap->ensure_parsability(true);  // retire TLABs
 315 
 316   if (VerifyBeforeGC && heap->total_collections() >= VerifyGCStartAt) {
 317     HandleMark hm;  // Discard invalid handles created during verification
 318     gclog_or_tty->print(" VerifyBeforeGC:");
 319     Universe::verify(true);
 320   }
 321 
 322   {
 323     ResourceMark rm;
 324     HandleMark hm;
 325 
 326     gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps);
 327     TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty);
 328     TraceTime t1(GCCauseString("GC", gc_cause), PrintGC, !PrintGCDetails, gclog_or_tty);
 329     TraceCollectorStats tcs(counters());
 330     TraceMemoryManagerStats tms(false /* not full GC */,gc_cause);
 331 
 332     if (TraceGen0Time) accumulated_time()->start();
 333 
 334     // Let the size policy know we're starting
 335     size_policy->minor_collection_begin();
 336 
 337     // Verify the object start arrays.
 338     if (VerifyObjectStartArray &&
 339         VerifyBeforeGC) {
 340       old_gen->verify_object_start_array();
 341       perm_gen->verify_object_start_array();
 342     }
 343 
 344     // Verify no unmarked old->young roots
 345     if (VerifyRememberedSets) {
 346       CardTableExtension::verify_all_young_refs_imprecise();
 347     }
 348