C++ ParallelScavengeHeap::update_counters方法代码示例

//.........这里部分代码省略.........
                                   old_gen->used_in_bytes(),
                                   perm_gen->used_in_bytes(),
				   young_gen->eden_space()->capacity_in_bytes(),
                                   old_gen->max_gen_size(),
                                   max_eden_size,
                                   false  /* full gc*/,
				   gc_cause);
        
	}
        // Resize the young generation at every collection
	// even if new sizes have not been calculated.  This is
	// to allow resizes that may have been inhibited by the
	// relative location of the "to" and "from" spaces.
        
	// Resizing the old gen at minor collects can cause increases
	// that don't feed back to the generation sizing policy until
	// a major collection.  Don't resize the old gen here.

        heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(),
                        size_policy->calculated_survivor_size_in_bytes());

        if (PrintAdaptiveSizePolicy) {
          gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ",
                         heap->total_collections());
        }
      }

      // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can
      // cause the change of the heap layout. Make sure eden is reshaped if that's the case.
      // Also update() will case adaptive NUMA chunk resizing.
      assert(young_gen->eden_space()->is_empty(), "eden space should be empty now");
      young_gen->eden_space()->update();

      heap->gc_policy_counters()->update_counters();

      heap->resize_all_tlabs();

      assert(young_gen->to_space()->is_empty(), "to space should be empty now");
    }

    DerivedPointerTable::update_pointers();

    NOT_PRODUCT(reference_processor()->verify_no_references_recorded());
    
    // Re-verify object start arrays
    if (VerifyObjectStartArray &&
	VerifyAfterGC) {
      old_gen->verify_object_start_array();
      perm_gen->verify_object_start_array();
    }

    // Verify all old -> young cards are now precise
    if (VerifyRememberedSets) {
      // Precise verification will give false positives. Until this is fixed,
      // use imprecise verification.
      // CardTableExtension::verify_all_young_refs_precise();
      CardTableExtension::verify_all_young_refs_imprecise();
    }

    if (TraceGen0Time) {
scavenge_time.stop();
      if (promotion_failure_occurred)
        accumulated_undo_time()->add(scavenge_time);
      else
        accumulated_gc_time()->add(scavenge_time);
    }

//.........这里部分代码省略.........
        assert(young_gen->max_size() >
          young_gen->from_space()->capacity_in_bytes() +
          young_gen->to_space()->capacity_in_bytes(),
          "Sizes of space in young gen are out-of-bounds");
        size_t max_eden_size = young_gen->max_size() -
          young_gen->from_space()->capacity_in_bytes() -
          young_gen->to_space()->capacity_in_bytes();
        size_policy->compute_generation_free_space(young_gen->used_in_bytes(),
                                 young_gen->eden_space()->used_in_bytes(),
                                 old_gen->used_in_bytes(),
                                 perm_gen->used_in_bytes(),
                                 young_gen->eden_space()->capacity_in_bytes(),
                                 old_gen->max_gen_size(),
                                 max_eden_size,
                                 true /* full gc*/,
                                 gc_cause);

        heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes());

        // Don't resize the young generation at an major collection.  A
        // desired young generation size may have been calculated but
        // resizing the young generation complicates the code because the
        // resizing of the old generation may have moved the boundary
        // between the young generation and the old generation.  Let the
        // young generation resizing happen at the minor collections.
      }
      if (PrintAdaptiveSizePolicy) {
        gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ",
                       heap->total_collections());
      }
    }

    if (UsePerfData) {
      heap->gc_policy_counters()->update_counters();
      heap->gc_policy_counters()->update_old_capacity(
        old_gen->capacity_in_bytes());
      heap->gc_policy_counters()->update_young_capacity(
        young_gen->capacity_in_bytes());
    }

    heap->resize_all_tlabs();

    // We collected the perm gen, so we'll resize it here.
    perm_gen->compute_new_size(perm_gen_prev_used);

    if (TraceGen1Time) accumulated_time()->stop();

    if (PrintGC) {
      if (PrintGCDetails) {
        // Don't print a GC timestamp here.  This is after the GC so
        // would be confusing.
        young_gen->print_used_change(young_gen_prev_used);
        old_gen->print_used_change(old_gen_prev_used);
      }
      heap->print_heap_change(prev_used);
      // Do perm gen after heap becase prev_used does
      // not include the perm gen (done this way in the other
      // collectors).
      if (PrintGCDetails) {
        perm_gen->print_used_change(perm_gen_prev_used);
      }
    }

    // Track memory usage and detect low memory
    MemoryService::track_memory_usage();
    heap->update_counters();

//.........这里部分代码省略.........
          young_gen->from_space()->capacity_in_bytes() -
          young_gen->to_space()->capacity_in_bytes();

        // Used for diagnostics
        size_policy->clear_generation_free_space_flags();

        size_policy->compute_generations_free_space(young_live,
                                                    eden_live,
                                                    old_live,
                                                    cur_eden,
                                                    max_old_gen_size,
                                                    max_eden_size,
                                                    true /* full gc*/);

        size_policy->check_gc_overhead_limit(young_live,
                                             eden_live,
                                             max_old_gen_size,
                                             max_eden_size,
                                             true /* full gc*/,
                                             gc_cause,
                                             heap->collector_policy());

        size_policy->decay_supplemental_growth(true /* full gc*/);

        heap->resize_old_gen(size_policy->calculated_old_free_size_in_bytes());

        heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(),
                               size_policy->calculated_survivor_size_in_bytes());
      }
      if (PrintAdaptiveSizePolicy) {
        gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ",
                       heap->total_collections());
      }
    }

    if (UsePerfData) {
      heap->gc_policy_counters()->update_counters();
      heap->gc_policy_counters()->update_old_capacity(
        old_gen->capacity_in_bytes());
      heap->gc_policy_counters()->update_young_capacity(
        young_gen->capacity_in_bytes());
    }

    heap->resize_all_tlabs();

    // We collected the heap, recalculate the metaspace capacity
    MetaspaceGC::compute_new_size();

    if (TraceOldGenTime) accumulated_time()->stop();

    if (PrintGC) {
      if (PrintGCDetails) {
        // Don't print a GC timestamp here.  This is after the GC so
        // would be confusing.
        young_gen->print_used_change(young_gen_prev_used);
        old_gen->print_used_change(old_gen_prev_used);
      }
      heap->print_heap_change(prev_used);
      if (PrintGCDetails) {
        MetaspaceAux::print_metaspace_change(metadata_prev_used);
      }
    }

    // Track memory usage and detect low memory
    MemoryService::track_memory_usage();
    heap->update_counters();
  }

  if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) {
    HandleMark hm;  // Discard invalid handles created during verification
    Universe::verify(" VerifyAfterGC:");
  }

  // Re-verify object start arrays
  if (VerifyObjectStartArray &&
      VerifyAfterGC) {
    old_gen->verify_object_start_array();
  }

  if (ZapUnusedHeapArea) {
    old_gen->object_space()->check_mangled_unused_area_complete();
  }

  NOT_PRODUCT(ref_processor()->verify_no_references_recorded());

  heap->print_heap_after_gc();
  heap->trace_heap_after_gc(_gc_tracer);

  heap->post_full_gc_dump(_gc_timer);

#ifdef TRACESPINNING
  ParallelTaskTerminator::print_termination_counts();
#endif

  _gc_timer->register_gc_end();

  _gc_tracer->report_gc_end(_gc_timer->gc_end(), _gc_timer->time_partitions());

  return true;
}

//.........这里部分代码省略.........
                                               eden_live,
                                               max_old_gen_size,
                                               max_eden_size,
                                               false /* not full gc*/,
                                               gc_cause,
                                               heap->collector_policy());

          size_policy->decay_supplemental_growth(false /* not full gc*/);
        }
        // Resize the young generation at every collection
        // even if new sizes have not been calculated.  This is
        // to allow resizes that may have been inhibited by the
        // relative location of the "to" and "from" spaces.

        // Resizing the old gen at minor collects can cause increases
        // that don't feed back to the generation sizing policy until
        // a major collection.  Don't resize the old gen here.

        heap->resize_young_gen(size_policy->calculated_eden_size_in_bytes(),
                        size_policy->calculated_survivor_size_in_bytes());

        if (PrintAdaptiveSizePolicy) {
          gclog_or_tty->print_cr("AdaptiveSizeStop: collection: %d ",
                         heap->total_collections());
        }
      }

      // Update the structure of the eden. With NUMA-eden CPU hotplugging or offlining can
      // cause the change of the heap layout. Make sure eden is reshaped if that's the case.
      // Also update() will case adaptive NUMA chunk resizing.
      assert(young_gen->eden_space()->is_empty(), "eden space should be empty now");
      young_gen->eden_space()->update();

      heap->gc_policy_counters()->update_counters();

      heap->resize_all_tlabs();

      assert(young_gen->to_space()->is_empty(), "to space should be empty now");
    }

    COMPILER2_PRESENT(DerivedPointerTable::update_pointers());

    NOT_PRODUCT(reference_processor()->verify_no_references_recorded());

    {
      GCTraceTime tm("Prune Scavenge Root Methods", false, false, &_gc_timer);

      CodeCache::prune_scavenge_root_nmethods();
    }

    // Re-verify object start arrays
    if (VerifyObjectStartArray &&
        VerifyAfterGC) {
      old_gen->verify_object_start_array();
    }

    // Verify all old -> young cards are now precise
    if (VerifyRememberedSets) {
      // Precise verification will give false positives. Until this is fixed,
      // use imprecise verification.
      // CardTableExtension::verify_all_young_refs_precise();
      CardTableExtension::verify_all_young_refs_imprecise();
    }

    if (TraceGen0Time) accumulated_time()->stop();

//.........这里部分代码省略.........
        mark_sweep_phase2();

        // Don't add any more derived pointers during phase3
        COMPILER2_ONLY(assert(DerivedPointerTable::is_active(), "Sanity"));
        COMPILER2_ONLY(DerivedPointerTable::set_active(false));

        mark_sweep_phase3();

        mark_sweep_phase4();

        restore_marks();

        deallocate_stacks();

        // "free at last gc" is calculated from these.
        Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity());
        Universe::set_heap_used_at_last_gc(Universe::heap()->used());

        bool all_empty = young_gen->eden_space()->is_empty() &&
                         young_gen->from_space()->is_empty() &&
                         young_gen->to_space()->is_empty();

        BarrierSet* bs = heap->barrier_set();
        if (bs->is_a(BarrierSet::ModRef)) {
            ModRefBarrierSet* modBS = (ModRefBarrierSet*)bs;
            MemRegion old_mr = heap->old_gen()->reserved();
            MemRegion perm_mr = heap->perm_gen()->reserved();
            assert(old_mr.end() <= perm_mr.start(), "Generations out of order");

            if (all_empty) {
                modBS->clear(MemRegion(old_mr.start(), perm_mr.end()));
            } else {
                modBS->invalidate(MemRegion(old_mr.start(), perm_mr.end()));
            }
        }

        Threads::gc_epilogue();
        NOT_CORE(CodeCache::gc_epilogue());

        COMPILER2_ONLY(DerivedPointerTable::update_pointers());

        notify_ref_lock |= ref_processor()->enqueue_discovered_references();

        // Update time of last GC
        reset_millis_since_last_gc();

        // Let the size policy know we're done
        size_policy->major_collection_end(old_gen->used_in_bytes());

        if (UseAdaptiveSizePolicy) {

            if (PrintAdaptiveSizePolicy) {
                tty->print_cr("AdaptiveSizeStart: collection: %d ",
                              heap->total_collections());
            }

            // Calculate optimial free space amounts
            size_policy->compute_generation_free_space(young_gen->used_in_bytes(),
                    old_gen->used_in_bytes(),
                    perm_gen->used_in_bytes(),
                    true /* full gc*/);

            // Resize old and young generations
            old_gen->resize(size_policy->calculated_old_free_size_in_bytes());

            young_gen->resize(size_policy->calculated_eden_size_in_bytes(),
                              size_policy->calculated_survivor_size_in_bytes());

            if (PrintAdaptiveSizePolicy) {
                tty->print_cr("AdaptiveSizeStop: collection: %d ",
                              heap->total_collections());
            }
        }

        // We collected the perm gen, so we'll resize it here.
        perm_gen->compute_new_size(perm_gen_prev_used);

        if (TraceGen1Time) accumulated_time()->stop();

        if (PrintGC) {
            heap->print_heap_change(prev_used);
        }

        heap->update_counters();
    }

    if (VerifyAfterGC && heap->total_collections() >= VerifyGCStartAt) {
        HandleMark hm;  // Discard invalid handles created during verification
        tty->print(" VerifyAfterGC:");
        Universe::verify(false);
    }

    NOT_PRODUCT(ref_processor()->verify_no_references_recorded());

    if (PrintHeapAtGC) {
        gclog_or_tty->print_cr(" Heap after GC invocations=%d:", heap->total_collections());
        Universe::print();
        gclog_or_tty->print("} ");
    }
}

//.........这里部分代码省略.........

    NOT_COMPILER2(ReferencePolicy *soft_ref_policy = new LRUCurrentHeapPolicy());
    COMPILER2_ONLY(ReferencePolicy *soft_ref_policy = new LRUMaxHeapPolicy());
    
    PSIsAliveClosure is_alive;
    PSKeepAliveClosure keep_alive(promotion_manager);
    PSEvacuateFollowersClosure evac_followers(promotion_manager);
    
    // Process reference objects discovered during scavenge
    reference_processor()->process_discovered_references(soft_ref_policy, &is_alive,
                                                         &keep_alive, &evac_followers);
    
    // Enqueue reference objects discovered during scavenge.
    notify_ref_lock = reference_processor()->enqueue_discovered_references();
    
    // Finally, flush the promotion_manager's labs, and deallocate its stacks.
    assert(promotion_manager->claimed_stack()->size() == 0, "Sanity");
    PSPromotionManager::post_scavenge();

    bool scavenge_promotion_failure = promotion_failed();
    if (scavenge_promotion_failure) {
      clean_up_failed_promotion();
      if (PrintGC) {
        gclog_or_tty->print("--");
      }
    }

    // Let the size policy know we're done. Note that we count promotion
    // failure cleanup time as part of the collection (otherwise, we're implicitly
    // saying it's mutator time).
    size_policy->minor_collection_end();

    if (!scavenge_promotion_failure) {
      // Swap the survivor spaces.
      young_gen->eden_space()->clear();
      young_gen->from_space()->clear();
      young_gen->swap_spaces();

      if (UseAdaptiveSizePolicy) {
        // Calculate the new survivor size and tenuring threshold
        size_t survived = young_gen->from_space()->used_in_bytes();
        size_t promoted = old_gen->used_in_bytes() - old_gen_used_before;

        if (PrintAdaptiveSizePolicy) {
          tty->print_cr("AdaptiveSizeStart: collection: %d ",
                         heap->total_collections());
        }

        size_t survivor_limit = 
	  size_policy->max_survivor_size(young_gen->max_size());
        _tenuring_threshold = 
           size_policy->compute_survivor_space_size_and_threshold(survived, 
                                                           promoted,
                                                           _survivor_overflow, 
                                                           _tenuring_threshold,
                                                           survivor_limit);

        // Calculate optimial free space amounts
        size_policy->compute_generation_free_space(young_gen->used_in_bytes(),
                                                   old_gen->used_in_bytes(),
                                                   perm_gen->used_in_bytes(),
                                                   false  /* full gc*/);
        
        // Resize the old and young generations
        old_gen->resize(size_policy->calculated_old_free_size_in_bytes());
        
        young_gen->resize(size_policy->calculated_eden_size_in_bytes(),
                          size_policy->calculated_survivor_size_in_bytes());

        if (PrintAdaptiveSizePolicy) {
          tty->print_cr("AdaptiveSizeStop: collection: %d ",
                         heap->total_collections());
        }


      }

      assert(young_gen->to_space()->is_empty(), "to space should be empty now");
    }

    COMPILER2_ONLY(DerivedPointerTable::update_pointers());
    
    NOT_PRODUCT(reference_processor()->verify_no_references_recorded());
        
    // Verify all old -> young cards are now precise
    if (VerifyRememberedSets) {
      // Precise verification will give false positives. Until this is fixed,
      // use imprecise verification.
      // CardTableExtension::verify_all_young_refs_precise();
      CardTableExtension::verify_all_young_refs_imprecise();
    }

    if (TraceGen0Time) accumulated_time()->stop();
    
    if (PrintGC) {
      heap->print_heap_change(prev_used);
    }

    heap->update_counters();
  }