hotspot/src/share/vm/gc/g1/g1Allocator.cpp
author tschatzl
Thu, 06 Aug 2015 15:49:50 +0200
changeset 32185 49a57ff2c3cb
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child 32193 862a68285b1e
permissions -rw-r--r--
8073052: Rename and clean up the allocation manager hierarchy in g1Allocator.?pp Summary: Fix naming of G1ParGCAllocator, decrease dependencies between G1CollectedHeap, G1Allocator and G1AllocRegion, additional documentation. Reviewed-by: mgerdin, jmasa, kbarrett
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/*
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 * Copyright (c) 2014, 2015, 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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#include "precompiled.hpp"
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#include "gc/g1/g1Allocator.inline.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "gc/g1/g1CollectorPolicy.hpp"
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#include "gc/g1/g1MarkSweep.hpp"
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#include "gc/g1/heapRegion.inline.hpp"
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#include "gc/g1/heapRegionSet.inline.hpp"
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void G1DefaultAllocator::init_mutator_alloc_region() {
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  assert(_mutator_alloc_region.get() == NULL, "pre-condition");
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  _mutator_alloc_region.init();
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}
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void G1DefaultAllocator::release_mutator_alloc_region() {
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  _mutator_alloc_region.release();
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  assert(_mutator_alloc_region.get() == NULL, "post-condition");
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}
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void G1Allocator::reuse_retained_old_region(EvacuationInfo& evacuation_info,
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                                            OldGCAllocRegion* old,
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                                            HeapRegion** retained_old) {
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  HeapRegion* retained_region = *retained_old;
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  *retained_old = NULL;
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  assert(retained_region == NULL || !retained_region->is_archive(),
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         err_msg("Archive region should not be alloc region (index %u)", retained_region->hrm_index()));
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  // We will discard the current GC alloc region if:
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  // a) it's in the collection set (it can happen!),
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  // b) it's already full (no point in using it),
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  // c) it's empty (this means that it was emptied during
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  // a cleanup and it should be on the free list now), or
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  // d) it's humongous (this means that it was emptied
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  // during a cleanup and was added to the free list, but
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  // has been subsequently used to allocate a humongous
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  // object that may be less than the region size).
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  if (retained_region != NULL &&
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      !retained_region->in_collection_set() &&
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      !(retained_region->top() == retained_region->end()) &&
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      !retained_region->is_empty() &&
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      !retained_region->is_humongous()) {
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    retained_region->record_timestamp();
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    // The retained region was added to the old region set when it was
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    // retired. We have to remove it now, since we don't allow regions
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    // we allocate to in the region sets. We'll re-add it later, when
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    // it's retired again.
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    _g1h->_old_set.remove(retained_region);
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    bool during_im = _g1h->collector_state()->during_initial_mark_pause();
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    retained_region->note_start_of_copying(during_im);
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    old->set(retained_region);
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    _g1h->_hr_printer.reuse(retained_region);
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    evacuation_info.set_alloc_regions_used_before(retained_region->used());
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  }
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}
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void G1DefaultAllocator::init_gc_alloc_regions(EvacuationInfo& evacuation_info) {
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  assert_at_safepoint(true /* should_be_vm_thread */);
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  _survivor_gc_alloc_region.init();
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  _old_gc_alloc_region.init();
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  reuse_retained_old_region(evacuation_info,
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                            &_old_gc_alloc_region,
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                            &_retained_old_gc_alloc_region);
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}
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void G1DefaultAllocator::release_gc_alloc_regions(EvacuationInfo& evacuation_info) {
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  AllocationContext_t context = AllocationContext::current();
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  evacuation_info.set_allocation_regions(survivor_gc_alloc_region(context)->count() +
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                                         old_gc_alloc_region(context)->count());
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  survivor_gc_alloc_region(context)->release();
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  // If we have an old GC alloc region to release, we'll save it in
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  // _retained_old_gc_alloc_region. If we don't
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  // _retained_old_gc_alloc_region will become NULL. This is what we
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  // want either way so no reason to check explicitly for either
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  // condition.
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  _retained_old_gc_alloc_region = old_gc_alloc_region(context)->release();
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  if (_retained_old_gc_alloc_region != NULL) {
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    _retained_old_gc_alloc_region->record_retained_region();
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  }
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  if (ResizePLAB) {
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    _g1h->alloc_buffer_stats(InCSetState::Young)->adjust_desired_plab_sz();
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    _g1h->alloc_buffer_stats(InCSetState::Old)->adjust_desired_plab_sz();
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  }
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}
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void G1DefaultAllocator::abandon_gc_alloc_regions() {
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  assert(survivor_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
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  assert(old_gc_alloc_region(AllocationContext::current())->get() == NULL, "pre-condition");
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  _retained_old_gc_alloc_region = NULL;
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}
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G1PLAB::G1PLAB(size_t gclab_word_size) :
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  PLAB(gclab_word_size), _retired(true) { }
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size_t G1Allocator::unsafe_max_tlab_alloc(AllocationContext_t context) {
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  // Return the remaining space in the cur alloc region, but not less than
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  // the min TLAB size.
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  // Also, this value can be at most the humongous object threshold,
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  // since we can't allow tlabs to grow big enough to accommodate
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  // humongous objects.
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  HeapRegion* hr = mutator_alloc_region(context)->get();
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  size_t max_tlab = _g1h->max_tlab_size() * wordSize;
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  if (hr == NULL) {
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    return max_tlab;
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  } else {
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    return MIN2(MAX2(hr->free(), (size_t) MinTLABSize), max_tlab);
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  }
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}
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HeapWord* G1Allocator::par_allocate_during_gc(InCSetState dest,
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                                              size_t word_size,
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                                              AllocationContext_t context) {
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  switch (dest.value()) {
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    case InCSetState::Young:
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      return survivor_attempt_allocation(word_size, context);
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    case InCSetState::Old:
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      return old_attempt_allocation(word_size, context);
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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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HeapWord* G1Allocator::survivor_attempt_allocation(size_t word_size,
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                                                   AllocationContext_t context) {
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  assert(!_g1h->is_humongous(word_size),
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         "we should not be seeing humongous-size allocations in this path");
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  HeapWord* result = survivor_gc_alloc_region(context)->attempt_allocation(word_size,
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                                                                           false /* bot_updates */);
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  if (result == NULL) {
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    MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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    result = survivor_gc_alloc_region(context)->attempt_allocation_locked(word_size,
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                                                                          false /* bot_updates */);
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  }
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  if (result != NULL) {
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    _g1h->dirty_young_block(result, word_size);
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  }
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  return result;
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}
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HeapWord* G1Allocator::old_attempt_allocation(size_t word_size,
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                                              AllocationContext_t context) {
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  assert(!_g1h->is_humongous(word_size),
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         "we should not be seeing humongous-size allocations in this path");
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  HeapWord* result = old_gc_alloc_region(context)->attempt_allocation(word_size,
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                                                                      true /* bot_updates */);
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  if (result == NULL) {
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    MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
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    result = old_gc_alloc_region(context)->attempt_allocation_locked(word_size,
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                                                                     true /* bot_updates */);
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  }
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  return result;
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}
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G1PLABAllocator::G1PLABAllocator(G1Allocator* allocator) :
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  _g1h(G1CollectedHeap::heap()),
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  _allocator(allocator),
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  _survivor_alignment_bytes(calc_survivor_alignment_bytes()) {
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}
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HeapWord* G1PLABAllocator::allocate_direct_or_new_plab(InCSetState dest,
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                                                       size_t word_sz,
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                                                       AllocationContext_t context) {
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  size_t gclab_word_size = _g1h->desired_plab_sz(dest);
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  if (word_sz * 100 < gclab_word_size * ParallelGCBufferWastePct) {
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    G1PLAB* alloc_buf = alloc_buffer(dest, context);
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    alloc_buf->retire();
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    HeapWord* buf = _allocator->par_allocate_during_gc(dest, gclab_word_size, context);
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    if (buf == NULL) {
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      return NULL; // Let caller handle allocation failure.
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    }
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    // Otherwise.
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    alloc_buf->set_word_size(gclab_word_size);
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    alloc_buf->set_buf(buf);
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    HeapWord* const obj = alloc_buf->allocate(word_sz);
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    assert(obj != NULL, "buffer was definitely big enough...");
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    return obj;
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  } else {
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    return _allocator->par_allocate_during_gc(dest, word_sz, context);
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  }
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}
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void G1PLABAllocator::undo_allocation(InCSetState dest, HeapWord* obj, size_t word_sz, AllocationContext_t context) {
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  alloc_buffer(dest, context)->undo_allocation(obj, word_sz);
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}
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G1DefaultPLABAllocator::G1DefaultPLABAllocator(G1Allocator* allocator) :
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  G1PLABAllocator(allocator),
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  _surviving_alloc_buffer(_g1h->desired_plab_sz(InCSetState::Young)),
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  _tenured_alloc_buffer(_g1h->desired_plab_sz(InCSetState::Old)) {
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  for (uint state = 0; state < InCSetState::Num; state++) {
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    _alloc_buffers[state] = NULL;
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  }
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  _alloc_buffers[InCSetState::Young] = &_surviving_alloc_buffer;
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  _alloc_buffers[InCSetState::Old]  = &_tenured_alloc_buffer;
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}
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void G1DefaultPLABAllocator::retire_alloc_buffers() {
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  for (uint state = 0; state < InCSetState::Num; state++) {
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    G1PLAB* const buf = _alloc_buffers[state];
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    if (buf != NULL) {
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      buf->flush_and_retire_stats(_g1h->alloc_buffer_stats(state));
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    }
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  }
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}
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void G1DefaultPLABAllocator::waste(size_t& wasted, size_t& undo_wasted) {
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  wasted = 0;
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  undo_wasted = 0;
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  for (uint state = 0; state < InCSetState::Num; state++) {
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    G1PLAB * const buf = _alloc_buffers[state];
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    if (buf != NULL) {
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      wasted += buf->waste();
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      undo_wasted += buf->undo_waste();
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    }
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  }
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}
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G1ArchiveAllocator* G1ArchiveAllocator::create_allocator(G1CollectedHeap* g1h) {
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  // Create the archive allocator, and also enable archive object checking
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  // in mark-sweep, since we will be creating archive regions.
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  G1ArchiveAllocator* result =  new G1ArchiveAllocator(g1h);
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  G1MarkSweep::enable_archive_object_check();
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  return result;
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}
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bool G1ArchiveAllocator::alloc_new_region() {
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  // Allocate the highest free region in the reserved heap,
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  // and add it to our list of allocated regions. It is marked
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  // archive and added to the old set.
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  HeapRegion* hr = _g1h->alloc_highest_free_region();
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  if (hr == NULL) {
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    return false;
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  }
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  assert(hr->is_empty(), err_msg("expected empty region (index %u)", hr->hrm_index()));
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  hr->set_archive();
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  _g1h->_old_set.add(hr);
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  _g1h->_hr_printer.alloc(hr, G1HRPrinter::Archive);
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  _allocated_regions.append(hr);
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  _allocation_region = hr;
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  // Set up _bottom and _max to begin allocating in the lowest
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  // min_region_size'd chunk of the allocated G1 region.
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  _bottom = hr->bottom();
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  _max = _bottom + HeapRegion::min_region_size_in_words();
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  // Tell mark-sweep that objects in this region are not to be marked.
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  G1MarkSweep::mark_range_archive(MemRegion(_bottom, HeapRegion::GrainWords));
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  // Since we've modified the old set, call update_sizes.
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  _g1h->g1mm()->update_sizes();
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  return true;
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}
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   284
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HeapWord* G1ArchiveAllocator::archive_mem_allocate(size_t word_size) {
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  assert(word_size != 0, "size must not be zero");
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  if (_allocation_region == NULL) {
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    if (!alloc_new_region()) {
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      return NULL;
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    }
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  }
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  HeapWord* old_top = _allocation_region->top();
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  assert(_bottom >= _allocation_region->bottom(),
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         err_msg("inconsistent allocation state: " PTR_FORMAT " < " PTR_FORMAT,
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                 p2i(_bottom), p2i(_allocation_region->bottom())));
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  assert(_max <= _allocation_region->end(),
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         err_msg("inconsistent allocation state: " PTR_FORMAT " > " PTR_FORMAT,
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                 p2i(_max), p2i(_allocation_region->end())));
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  assert(_bottom <= old_top && old_top <= _max,
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         err_msg("inconsistent allocation state: expected "
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                 PTR_FORMAT " <= " PTR_FORMAT " <= " PTR_FORMAT,
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                 p2i(_bottom), p2i(old_top), p2i(_max)));
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   303
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  // Allocate the next word_size words in the current allocation chunk.
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  // If allocation would cross the _max boundary, insert a filler and begin
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  // at the base of the next min_region_size'd chunk. Also advance to the next
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  // chunk if we don't yet cross the boundary, but the remainder would be too
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  // small to fill.
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  HeapWord* new_top = old_top + word_size;
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  size_t remainder = pointer_delta(_max, new_top);
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  if ((new_top > _max) ||
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      ((new_top < _max) && (remainder < CollectedHeap::min_fill_size()))) {
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    if (old_top != _max) {
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      size_t fill_size = pointer_delta(_max, old_top);
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      CollectedHeap::fill_with_object(old_top, fill_size);
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      _summary_bytes_used += fill_size * HeapWordSize;
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    }
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    _allocation_region->set_top(_max);
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    old_top = _bottom = _max;
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    // Check if we've just used up the last min_region_size'd chunk
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    // in the current region, and if so, allocate a new one.
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    if (_bottom != _allocation_region->end()) {
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      _max = _bottom + HeapRegion::min_region_size_in_words();
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   325
    } else {
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      if (!alloc_new_region()) {
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   327
        return NULL;
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   328
      }
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      old_top = _allocation_region->bottom();
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   330
    }
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   331
  }
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  _allocation_region->set_top(old_top + word_size);
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  _summary_bytes_used += word_size * HeapWordSize;
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   334
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  return old_top;
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   336
}
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diff changeset
   337
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   338
void G1ArchiveAllocator::complete_archive(GrowableArray<MemRegion>* ranges,
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   339
                                          size_t end_alignment_in_bytes) {
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   340
  assert((end_alignment_in_bytes >> LogHeapWordSize) < HeapRegion::min_region_size_in_words(),
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          err_msg("alignment " SIZE_FORMAT " too large", end_alignment_in_bytes));
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  assert(is_size_aligned(end_alignment_in_bytes, HeapWordSize),
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         err_msg("alignment " SIZE_FORMAT " is not HeapWord (%u) aligned", end_alignment_in_bytes, HeapWordSize));
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   344
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   345
  // If we've allocated nothing, simply return.
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   346
  if (_allocation_region == NULL) {
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   347
    return;
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   348
  }
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   349
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   350
  // If an end alignment was requested, insert filler objects.
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   351
  if (end_alignment_in_bytes != 0) {
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   352
    HeapWord* currtop = _allocation_region->top();
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    HeapWord* newtop = (HeapWord*)align_pointer_up(currtop, end_alignment_in_bytes);
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   354
    size_t fill_size = pointer_delta(newtop, currtop);
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   355
    if (fill_size != 0) {
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   356
      if (fill_size < CollectedHeap::min_fill_size()) {
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   357
        // If the required fill is smaller than we can represent,
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   358
        // bump up to the next aligned address. We know we won't exceed the current
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   359
        // region boundary because the max supported alignment is smaller than the min
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   360
        // region size, and because the allocation code never leaves space smaller than
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   361
        // the min_fill_size at the top of the current allocation region.
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   362
        newtop = (HeapWord*)align_pointer_up(currtop + CollectedHeap::min_fill_size(),
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   363
                                             end_alignment_in_bytes);
a70d45c06136 8042668: GC Support for shared heap ranges in CDS
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   364
        fill_size = pointer_delta(newtop, currtop);
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   365
      }
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   366
      HeapWord* fill = archive_mem_allocate(fill_size);
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   367
      CollectedHeap::fill_with_objects(fill, fill_size);
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   368
    }
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   369
  }
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   370
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   371
  // Loop through the allocated regions, and create MemRegions summarizing
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   372
  // the allocated address range, combining contiguous ranges. Add the
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   373
  // MemRegions to the GrowableArray provided by the caller.
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   374
  int index = _allocated_regions.length() - 1;
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   375
  assert(_allocated_regions.at(index) == _allocation_region,
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   376
         err_msg("expected region %u at end of array, found %u",
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   377
                 _allocation_region->hrm_index(), _allocated_regions.at(index)->hrm_index()));
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   378
  HeapWord* base_address = _allocation_region->bottom();
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   379
  HeapWord* top = base_address;
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   380
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   381
  while (index >= 0) {
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   382
    HeapRegion* next = _allocated_regions.at(index);
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   383
    HeapWord* new_base = next->bottom();
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   384
    HeapWord* new_top = next->top();
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   385
    if (new_base != top) {
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   386
      ranges->append(MemRegion(base_address, pointer_delta(top, base_address)));
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   387
      base_address = new_base;
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   388
    }
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   389
    top = new_top;
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   390
    index = index - 1;
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   391
  }
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diff changeset
   392
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   393
  assert(top != base_address, err_msg("zero-sized range, address " PTR_FORMAT, p2i(base_address)));
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   394
  ranges->append(MemRegion(base_address, pointer_delta(top, base_address)));
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   395
  _allocated_regions.clear();
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   396
  _allocation_region = NULL;
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   397
};