531   assert(full || size > 0, "otherwise we don't want to collect");
 532   GenCollectedHeap* gch = GenCollectedHeap::heap();
 533   _next_gen = gch->next_gen(this);
 534   assert(_next_gen != NULL,
 535     "This must be the youngest gen, and not the only gen");
 536 
 537   // If the next generation is too full to accomodate promotion
 538   // from this generation, pass on collection; let the next generation
 539   // do it.
 540   if (!collection_attempt_is_safe()) {
 541     if (Verbose && PrintGCDetails) {
 542       gclog_or_tty->print(" :: Collection attempt not safe :: ");
 543     }
 544     gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one
 545     return;
 546   }
 547   assert(to()->is_empty(), "Else not collection_attempt_is_safe");
 548 
 549   init_assuming_no_promotion_failure();
 550 
 551   TraceTime t1("GC", PrintGC && !PrintGCDetails, true, gclog_or_tty);
 552   // Capture heap used before collection (for printing).
 553   size_t gch_prev_used = gch->used();
 554 
 555   SpecializationStats::clear();
 556 
 557   // These can be shared for all code paths
 558   IsAliveClosure is_alive(this);
 559   ScanWeakRefClosure scan_weak_ref(this);
 560 
 561   age_table()->clear();
 562   to()->clear(SpaceDecorator::Mangle);
 563 
 564   gch->rem_set()->prepare_for_younger_refs_iterate(false);
 565 
 566   assert(gch->no_allocs_since_save_marks(0),
 567          "save marks have not been newly set.");
 568 
 569   // Not very pretty.
 570   CollectorPolicy* cp = gch->collector_policy();
 571 

 531   assert(full || size > 0, "otherwise we don't want to collect");
 532   GenCollectedHeap* gch = GenCollectedHeap::heap();
 533   _next_gen = gch->next_gen(this);
 534   assert(_next_gen != NULL,
 535     "This must be the youngest gen, and not the only gen");
 536 
 537   // If the next generation is too full to accomodate promotion
 538   // from this generation, pass on collection; let the next generation
 539   // do it.
 540   if (!collection_attempt_is_safe()) {
 541     if (Verbose && PrintGCDetails) {
 542       gclog_or_tty->print(" :: Collection attempt not safe :: ");
 543     }
 544     gch->set_incremental_collection_failed(); // Slight lie: we did not even attempt one
 545     return;
 546   }
 547   assert(to()->is_empty(), "Else not collection_attempt_is_safe");
 548 
 549   init_assuming_no_promotion_failure();
 550 
 551   TraceTime t1(GCCauseString("GC", gch->gc_cause()), PrintGC && !PrintGCDetails, true, gclog_or_tty);
 552   // Capture heap used before collection (for printing).
 553   size_t gch_prev_used = gch->used();
 554 
 555   SpecializationStats::clear();
 556 
 557   // These can be shared for all code paths
 558   IsAliveClosure is_alive(this);
 559   ScanWeakRefClosure scan_weak_ref(this);
 560 
 561   age_table()->clear();
 562   to()->clear(SpaceDecorator::Mangle);
 563 
 564   gch->rem_set()->prepare_for_younger_refs_iterate(false);
 565 
 566   assert(gch->no_allocs_since_save_marks(0),
 567          "save marks have not been newly set.");
 568 
 569   // Not very pretty.
 570   CollectorPolicy* cp = gch->collector_policy();
 571