src/hotspot/share/gc/g1/g1CollectedHeap.inline.hpp
author sangheki
Fri, 21 Dec 2018 08:18:59 -0800
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8211425: Allocation of old generation of java heap on alternate memory devices - G1 GC 8202286: Allocation of old generation of Java heap on alternate memory devices Summary: Enable an experimental feature in HotSpot JVM to allocate old generation of G1 GC on an alternative memory device, such as NV-DIMMs. Reviewed-by: sangheki, sjohanss Contributed-by: kishor.kharbas@intel.com
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/*
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 * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP
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#define SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP
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#include "gc/g1/g1BarrierSet.hpp"
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#include "gc/g1/g1CollectedHeap.hpp"
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#include "gc/g1/g1CollectorState.hpp"
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#include "gc/g1/heapRegionManager.inline.hpp"
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#include "gc/g1/heapRegionSet.inline.hpp"
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#include "gc/shared/taskqueue.inline.hpp"
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#include "runtime/orderAccess.hpp"
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G1EvacStats* G1CollectedHeap::alloc_buffer_stats(InCSetState dest) {
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  switch (dest.value()) {
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    case InCSetState::Young:
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      return &_survivor_evac_stats;
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    case InCSetState::Old:
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      return &_old_evac_stats;
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    default:
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      ShouldNotReachHere();
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      return NULL; // Keep some compilers happy
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  }
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}
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size_t G1CollectedHeap::desired_plab_sz(InCSetState dest) {
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  size_t gclab_word_size = alloc_buffer_stats(dest)->desired_plab_sz(workers()->active_workers());
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  // Prevent humongous PLAB sizes for two reasons:
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  // * PLABs are allocated using a similar paths as oops, but should
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  //   never be in a humongous region
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  // * Allowing humongous PLABs needlessly churns the region free lists
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  return MIN2(_humongous_object_threshold_in_words, gclab_word_size);
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}
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// Inline functions for G1CollectedHeap
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// Return the region with the given index. It assumes the index is valid.
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inline HeapRegion* G1CollectedHeap::region_at(uint index) const { return _hrm->at(index); }
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// Return the region with the given index, or NULL if unmapped. It assumes the index is valid.
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inline HeapRegion* G1CollectedHeap::region_at_or_null(uint index) const { return _hrm->at_or_null(index); }
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inline HeapRegion* G1CollectedHeap::next_region_in_humongous(HeapRegion* hr) const {
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  return _hrm->next_region_in_humongous(hr);
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}
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inline uint G1CollectedHeap::addr_to_region(HeapWord* addr) const {
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  assert(is_in_reserved(addr),
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         "Cannot calculate region index for address " PTR_FORMAT " that is outside of the heap [" PTR_FORMAT ", " PTR_FORMAT ")",
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         p2i(addr), p2i(reserved_region().start()), p2i(reserved_region().end()));
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  return (uint)(pointer_delta(addr, reserved_region().start(), sizeof(uint8_t)) >> HeapRegion::LogOfHRGrainBytes);
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}
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inline HeapWord* G1CollectedHeap::bottom_addr_for_region(uint index) const {
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  return _hrm->reserved().start() + index * HeapRegion::GrainWords;
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}
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template <class T>
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inline HeapRegion* G1CollectedHeap::heap_region_containing(const T addr) const {
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  assert(addr != NULL, "invariant");
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  assert(is_in_g1_reserved((const void*) addr),
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         "Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")",
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         p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end()));
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  return _hrm->addr_to_region((HeapWord*) addr);
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}
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template <class T>
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inline HeapRegion* G1CollectedHeap::heap_region_containing_or_null(const T addr) const {
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  assert(addr != NULL, "invariant");
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  assert(is_in_g1_reserved((const void*) addr),
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         "Address " PTR_FORMAT " is outside of the heap ranging from [" PTR_FORMAT " to " PTR_FORMAT ")",
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         p2i((void*)addr), p2i(g1_reserved().start()), p2i(g1_reserved().end()));
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  uint const region_idx = addr_to_region(addr);
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  return region_at_or_null(region_idx);
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}
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inline void G1CollectedHeap::old_set_add(HeapRegion* hr) {
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  _old_set.add(hr);
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}
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inline void G1CollectedHeap::old_set_remove(HeapRegion* hr) {
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  _old_set.remove(hr);
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}
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inline void G1CollectedHeap::archive_set_add(HeapRegion* hr) {
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  _archive_set.add(hr);
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}
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// It dirties the cards that cover the block so that the post
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// write barrier never queues anything when updating objects on this
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// block. It is assumed (and in fact we assert) that the block
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// belongs to a young region.
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inline void
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G1CollectedHeap::dirty_young_block(HeapWord* start, size_t word_size) {
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  assert_heap_not_locked();
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  // Assign the containing region to containing_hr so that we don't
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  // have to keep calling heap_region_containing() in the
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  // asserts below.
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  DEBUG_ONLY(HeapRegion* containing_hr = heap_region_containing(start);)
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  assert(word_size > 0, "pre-condition");
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  assert(containing_hr->is_in(start), "it should contain start");
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  assert(containing_hr->is_young(), "it should be young");
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  assert(!containing_hr->is_humongous(), "it should not be humongous");
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  HeapWord* end = start + word_size;
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  assert(containing_hr->is_in(end - 1), "it should also contain end - 1");
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  MemRegion mr(start, end);
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  card_table()->g1_mark_as_young(mr);
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}
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inline RefToScanQueue* G1CollectedHeap::task_queue(uint i) const {
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  return _task_queues->queue(i);
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}
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inline bool G1CollectedHeap::is_marked_next(oop obj) const {
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  return _cm->next_mark_bitmap()->is_marked((HeapWord*)obj);
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}
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inline bool G1CollectedHeap::is_in_cset(oop obj) {
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  return is_in_cset((HeapWord*)obj);
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}
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inline bool G1CollectedHeap::is_in_cset(HeapWord* addr) {
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  return _in_cset_fast_test.is_in_cset(addr);
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}
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bool G1CollectedHeap::is_in_cset(const HeapRegion* hr) {
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  return _in_cset_fast_test.is_in_cset(hr);
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}
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bool G1CollectedHeap::is_in_cset_or_humongous(const oop obj) {
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  return _in_cset_fast_test.is_in_cset_or_humongous((HeapWord*)obj);
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}
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InCSetState G1CollectedHeap::in_cset_state(const oop obj) {
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  return _in_cset_fast_test.at((HeapWord*)obj);
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}
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void G1CollectedHeap::register_humongous_region_with_cset(uint index) {
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  _in_cset_fast_test.set_humongous(index);
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}
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#ifndef PRODUCT
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// Support for G1EvacuationFailureALot
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inline bool
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G1CollectedHeap::evacuation_failure_alot_for_gc_type(bool for_young_gc,
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                                                     bool during_initial_mark,
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                                                     bool mark_or_rebuild_in_progress) {
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  bool res = false;
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  if (mark_or_rebuild_in_progress) {
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    res |= G1EvacuationFailureALotDuringConcMark;
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  }
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  if (during_initial_mark) {
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    res |= G1EvacuationFailureALotDuringInitialMark;
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  }
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  if (for_young_gc) {
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    res |= G1EvacuationFailureALotDuringYoungGC;
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  } else {
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    // GCs are mixed
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    res |= G1EvacuationFailureALotDuringMixedGC;
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  }
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  return res;
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}
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inline void
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G1CollectedHeap::set_evacuation_failure_alot_for_current_gc() {
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  if (G1EvacuationFailureALot) {
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    // Note we can't assert that _evacuation_failure_alot_for_current_gc
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    // is clear here. It may have been set during a previous GC but that GC
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    // did not copy enough objects (i.e. G1EvacuationFailureALotCount) to
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    // trigger an evacuation failure and clear the flags and and counts.
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    // Check if we have gone over the interval.
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    const size_t gc_num = total_collections();
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    const size_t elapsed_gcs = gc_num - _evacuation_failure_alot_gc_number;
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    _evacuation_failure_alot_for_current_gc = (elapsed_gcs >= G1EvacuationFailureALotInterval);
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    // Now check if G1EvacuationFailureALot is enabled for the current GC type.
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    const bool in_young_only_phase = collector_state()->in_young_only_phase();
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    const bool in_initial_mark_gc = collector_state()->in_initial_mark_gc();
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    const bool mark_or_rebuild_in_progress = collector_state()->mark_or_rebuild_in_progress();
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    _evacuation_failure_alot_for_current_gc &=
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      evacuation_failure_alot_for_gc_type(in_young_only_phase,
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                                          in_initial_mark_gc,
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                                          mark_or_rebuild_in_progress);
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  }
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}
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inline bool G1CollectedHeap::evacuation_should_fail() {
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  if (!G1EvacuationFailureALot || !_evacuation_failure_alot_for_current_gc) {
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    return false;
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  }
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  // G1EvacuationFailureALot is in effect for current GC
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  // Access to _evacuation_failure_alot_count is not atomic;
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  // the value does not have to be exact.
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  if (++_evacuation_failure_alot_count < G1EvacuationFailureALotCount) {
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    return false;
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  }
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  _evacuation_failure_alot_count = 0;
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  return true;
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}
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inline void G1CollectedHeap::reset_evacuation_should_fail() {
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  if (G1EvacuationFailureALot) {
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    _evacuation_failure_alot_gc_number = total_collections();
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    _evacuation_failure_alot_count = 0;
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    _evacuation_failure_alot_for_current_gc = false;
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  }
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}
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#endif  // #ifndef PRODUCT
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inline bool G1CollectedHeap::is_in_young(const oop obj) {
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  if (obj == NULL) {
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    return false;
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  }
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  return heap_region_containing(obj)->is_young();
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}
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inline bool G1CollectedHeap::is_obj_dead(const oop obj) const {
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  if (obj == NULL) {
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    return false;
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  }
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  return is_obj_dead(obj, heap_region_containing(obj));
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}
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inline bool G1CollectedHeap::is_obj_ill(const oop obj) const {
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  if (obj == NULL) {
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    return false;
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  }
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  return is_obj_ill(obj, heap_region_containing(obj));
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}
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inline bool G1CollectedHeap::is_obj_dead_full(const oop obj, const HeapRegion* hr) const {
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   return !is_marked_next(obj) && !hr->is_archive();
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}
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inline bool G1CollectedHeap::is_obj_dead_full(const oop obj) const {
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    return is_obj_dead_full(obj, heap_region_containing(obj));
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}
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inline void G1CollectedHeap::set_humongous_reclaim_candidate(uint region, bool value) {
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  assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object");
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  _humongous_reclaim_candidates.set_candidate(region, value);
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}
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inline bool G1CollectedHeap::is_humongous_reclaim_candidate(uint region) {
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  assert(_hrm->at(region)->is_starts_humongous(), "Must start a humongous object");
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  return _humongous_reclaim_candidates.is_candidate(region);
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}
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inline void G1CollectedHeap::set_humongous_is_live(oop obj) {
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  uint region = addr_to_region((HeapWord*)obj);
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  // Clear the flag in the humongous_reclaim_candidates table.  Also
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  // reset the entry in the _in_cset_fast_test table so that subsequent references
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  // to the same humongous object do not go into the slow path again.
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  // This is racy, as multiple threads may at the same time enter here, but this
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  // is benign.
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  // During collection we only ever clear the "candidate" flag, and only ever clear the
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  // entry in the in_cset_fast_table.
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  // We only ever evaluate the contents of these tables (in the VM thread) after
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  // having synchronized the worker threads with the VM thread, or in the same
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  // thread (i.e. within the VM thread).
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  if (is_humongous_reclaim_candidate(region)) {
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    set_humongous_reclaim_candidate(region, false);
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    _in_cset_fast_test.clear_humongous(region);
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  }
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}
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#endif // SHARE_VM_GC_G1_G1COLLECTEDHEAP_INLINE_HPP