273   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
 274   GCCause::Cause gc_cause = heap->gc_cause();
 275 
 276   // Check for potential problems.
 277   if (!should_attempt_scavenge()) {
 278     return false;
 279   }
 280 
 281   _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start());
 282 
 283   bool promotion_failure_occurred = false;
 284 
 285   PSYoungGen* young_gen = heap->young_gen();
 286   PSOldGen* old_gen = heap->old_gen();
 287   PSAdaptiveSizePolicy* size_policy = heap->size_policy();
 288 
 289   heap->increment_total_collections();
 290 
 291   AdaptiveSizePolicyOutput(size_policy, heap->total_collections());
 292 
 293   if ((gc_cause != GCCause::_java_lang_system_gc) ||
 294        UseAdaptiveSizePolicyWithSystemGC) {
 295     // Gather the feedback data for eden occupancy.
 296     young_gen->eden_space()->accumulate_statistics();
 297   }
 298 
 299   if (ZapUnusedHeapArea) {
 300     // Save information needed to minimize mangling
 301     heap->record_gen_tops_before_GC();
 302   }
 303 
 304   heap->print_heap_before_gc();
 305   heap->trace_heap_before_gc(&_gc_tracer);
 306 
 307   assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity");
 308   assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity");
 309 
 310   size_t prev_used = heap->used();
 311 
 312   // Fill in TLABs
 313   heap->accumulate_statistics_all_tlabs();

 273   ParallelScavengeHeap* heap = ParallelScavengeHeap::heap();
 274   GCCause::Cause gc_cause = heap->gc_cause();
 275 
 276   // Check for potential problems.
 277   if (!should_attempt_scavenge()) {
 278     return false;
 279   }
 280 
 281   _gc_tracer.report_gc_start(heap->gc_cause(), _gc_timer.gc_start());
 282 
 283   bool promotion_failure_occurred = false;
 284 
 285   PSYoungGen* young_gen = heap->young_gen();
 286   PSOldGen* old_gen = heap->old_gen();
 287   PSAdaptiveSizePolicy* size_policy = heap->size_policy();
 288 
 289   heap->increment_total_collections();
 290 
 291   AdaptiveSizePolicyOutput(size_policy, heap->total_collections());
 292 
 293   if (!GCCause::is_user_requested_gc(gc_cause) ||
 294        UseAdaptiveSizePolicyWithSystemGC) {
 295     // Gather the feedback data for eden occupancy.
 296     young_gen->eden_space()->accumulate_statistics();
 297   }
 298 
 299   if (ZapUnusedHeapArea) {
 300     // Save information needed to minimize mangling
 301     heap->record_gen_tops_before_GC();
 302   }
 303 
 304   heap->print_heap_before_gc();
 305   heap->trace_heap_before_gc(&_gc_tracer);
 306 
 307   assert(!NeverTenure || _tenuring_threshold == markOopDesc::max_age + 1, "Sanity");
 308   assert(!AlwaysTenure || _tenuring_threshold == 0, "Sanity");
 309 
 310   size_t prev_used = heap->used();
 311 
 312   // Fill in TLABs
 313   heap->accumulate_statistics_all_tlabs();