hotspot/src/share/vm/gc/g1/g1Allocator.cpp
author pliden
Wed, 13 May 2015 15:16:06 +0200
changeset 30764 fec48bf5a827
parent 30586 hotspot/src/share/vm/gc_implementation/g1/g1Allocator.cpp@23e6e981e89c
child 31331 a7c714b6cfb3
permissions -rw-r--r--
8079792: GC directory structure cleanup Reviewed-by: brutisso, stefank, david
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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.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/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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  // 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->g1_policy()->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(uint no_of_gc_workers, 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(no_of_gc_workers);
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    _g1h->alloc_buffer_stats(InCSetState::Old)->adjust_desired_plab_sz(no_of_gc_workers);
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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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HeapWord* G1ParGCAllocator::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 = _g1h->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 _g1h->par_allocate_during_gc(dest, word_sz, context);
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  }
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}
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G1DefaultParGCAllocator::G1DefaultParGCAllocator(G1CollectedHeap* g1h) :
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  G1ParGCAllocator(g1h),
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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 G1DefaultParGCAllocator::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 G1DefaultParGCAllocator::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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}