hotspot/src/share/vm/gc/g1/g1AllocRegion.cpp
author tschatzl
Mon, 24 Aug 2015 16:27:41 +0200
changeset 32389 626f27450e12
parent 32379 aa14adafaf0f
child 33105 294e48b4f704
permissions -rw-r--r--
8067336: Allow that PLAB allocations at the end of regions are flexible Summary: PLAB allocations may return a buffer that is between minimum size (current allocation) and the desired size. This allows removes a large amount of fragmentation at the end of regions. Reviewed-by: tbenson, mgerdin
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/*
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 * Copyright (c) 2011, 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/g1AllocRegion.inline.hpp"
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#include "gc/g1/g1CollectedHeap.inline.hpp"
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#include "runtime/orderAccess.inline.hpp"
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G1CollectedHeap* G1AllocRegion::_g1h = NULL;
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HeapRegion* G1AllocRegion::_dummy_region = NULL;
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void G1AllocRegion::setup(G1CollectedHeap* g1h, HeapRegion* dummy_region) {
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  assert(_dummy_region == NULL, "should be set once");
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  assert(dummy_region != NULL, "pre-condition");
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  assert(dummy_region->free() == 0, "pre-condition");
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  // Make sure that any allocation attempt on this region will fail
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  // and will not trigger any asserts.
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  assert(allocate(dummy_region, 1, false) == NULL, "should fail");
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  assert(par_allocate(dummy_region, 1, false) == NULL, "should fail");
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  assert(allocate(dummy_region, 1, true) == NULL, "should fail");
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  assert(par_allocate(dummy_region, 1, true) == NULL, "should fail");
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  _g1h = g1h;
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  _dummy_region = dummy_region;
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}
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size_t G1AllocRegion::fill_up_remaining_space(HeapRegion* alloc_region,
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                                              bool bot_updates) {
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  assert(alloc_region != NULL && alloc_region != _dummy_region,
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         "pre-condition");
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  size_t result = 0;
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  // Other threads might still be trying to allocate using a CAS out
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  // of the region we are trying to retire, as they can do so without
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  // holding the lock. So, we first have to make sure that noone else
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  // can allocate out of it by doing a maximal allocation. Even if our
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  // CAS attempt fails a few times, we'll succeed sooner or later
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  // given that failed CAS attempts mean that the region is getting
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  // closed to being full.
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  size_t free_word_size = alloc_region->free() / HeapWordSize;
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  // This is the minimum free chunk we can turn into a dummy
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  // object. If the free space falls below this, then noone can
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  // allocate in this region anyway (all allocation requests will be
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  // of a size larger than this) so we won't have to perform the dummy
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  // allocation.
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  size_t min_word_size_to_fill = CollectedHeap::min_fill_size();
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  while (free_word_size >= min_word_size_to_fill) {
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    HeapWord* dummy = par_allocate(alloc_region, free_word_size, bot_updates);
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    if (dummy != NULL) {
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      // If the allocation was successful we should fill in the space.
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      CollectedHeap::fill_with_object(dummy, free_word_size);
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      alloc_region->set_pre_dummy_top(dummy);
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      result += free_word_size * HeapWordSize;
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      break;
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    }
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    free_word_size = alloc_region->free() / HeapWordSize;
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    // It's also possible that someone else beats us to the
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    // allocation and they fill up the region. In that case, we can
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    // just get out of the loop.
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  }
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  result += alloc_region->free();
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  assert(alloc_region->free() / HeapWordSize < min_word_size_to_fill,
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         "post-condition");
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  return result;
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}
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size_t G1AllocRegion::retire(bool fill_up) {
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  assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));
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  size_t result = 0;
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  trace("retiring");
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  HeapRegion* alloc_region = _alloc_region;
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  if (alloc_region != _dummy_region) {
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    // We never have to check whether the active region is empty or not,
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    // and potentially free it if it is, given that it's guaranteed that
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    // it will never be empty.
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    assert(!alloc_region->is_empty(),
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           ar_ext_msg(this, "the alloc region should never be empty"));
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    if (fill_up) {
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      result = fill_up_remaining_space(alloc_region, _bot_updates);
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    }
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    assert(alloc_region->used() >= _used_bytes_before,
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           ar_ext_msg(this, "invariant"));
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    size_t allocated_bytes = alloc_region->used() - _used_bytes_before;
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    retire_region(alloc_region, allocated_bytes);
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    _used_bytes_before = 0;
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    _alloc_region = _dummy_region;
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  }
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  trace("retired");
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  return result;
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}
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HeapWord* G1AllocRegion::new_alloc_region_and_allocate(size_t word_size,
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                                                       bool force) {
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  assert(_alloc_region == _dummy_region, ar_ext_msg(this, "pre-condition"));
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  assert(_used_bytes_before == 0, ar_ext_msg(this, "pre-condition"));
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  trace("attempting region allocation");
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  HeapRegion* new_alloc_region = allocate_new_region(word_size, force);
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  if (new_alloc_region != NULL) {
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    new_alloc_region->reset_pre_dummy_top();
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    // Need to do this before the allocation
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    _used_bytes_before = new_alloc_region->used();
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    HeapWord* result = allocate(new_alloc_region, word_size, _bot_updates);
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    assert(result != NULL, ar_ext_msg(this, "the allocation should succeeded"));
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    OrderAccess::storestore();
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    // Note that we first perform the allocation and then we store the
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    // region in _alloc_region. This is the reason why an active region
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    // can never be empty.
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    update_alloc_region(new_alloc_region);
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    trace("region allocation successful");
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    return result;
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  } else {
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    trace("region allocation failed");
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    return NULL;
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  }
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  ShouldNotReachHere();
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}
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void G1AllocRegion::fill_in_ext_msg(ar_ext_msg* msg, const char* message) {
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  msg->append("[%s] %s c: %u b: %s r: " PTR_FORMAT " u: " SIZE_FORMAT,
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              _name, message, _count, BOOL_TO_STR(_bot_updates),
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              p2i(_alloc_region), _used_bytes_before);
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}
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void G1AllocRegion::init() {
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  trace("initializing");
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  assert(_alloc_region == NULL && _used_bytes_before == 0,
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         ar_ext_msg(this, "pre-condition"));
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  assert(_dummy_region != NULL, ar_ext_msg(this, "should have been set"));
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  _alloc_region = _dummy_region;
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  _count = 0;
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  trace("initialized");
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}
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void G1AllocRegion::set(HeapRegion* alloc_region) {
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  trace("setting");
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  // We explicitly check that the region is not empty to make sure we
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  // maintain the "the alloc region cannot be empty" invariant.
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  assert(alloc_region != NULL && !alloc_region->is_empty(),
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         ar_ext_msg(this, "pre-condition"));
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  assert(_alloc_region == _dummy_region &&
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         _used_bytes_before == 0 && _count == 0,
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         ar_ext_msg(this, "pre-condition"));
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  _used_bytes_before = alloc_region->used();
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  _alloc_region = alloc_region;
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  _count += 1;
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  trace("set");
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}
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void G1AllocRegion::update_alloc_region(HeapRegion* alloc_region) {
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  trace("update");
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  // We explicitly check that the region is not empty to make sure we
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  // maintain the "the alloc region cannot be empty" invariant.
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  assert(alloc_region != NULL && !alloc_region->is_empty(),
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         ar_ext_msg(this, "pre-condition"));
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  _alloc_region = alloc_region;
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  _alloc_region->set_allocation_context(allocation_context());
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  _count += 1;
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  trace("updated");
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}
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HeapRegion* G1AllocRegion::release() {
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  trace("releasing");
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  HeapRegion* alloc_region = _alloc_region;
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  retire(false /* fill_up */);
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  assert(_alloc_region == _dummy_region,
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         ar_ext_msg(this, "post-condition of retire()"));
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  _alloc_region = NULL;
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  trace("released");
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  return (alloc_region == _dummy_region) ? NULL : alloc_region;
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}
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#if G1_ALLOC_REGION_TRACING
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void G1AllocRegion::trace(const char* str, size_t min_word_size, size_t desired_word_size, size_t actual_word_size, HeapWord* result) {
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  // All the calls to trace that set either just the size or the size
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  // and the result are considered part of level 2 tracing and are
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  // skipped during level 1 tracing.
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  if ((actual_word_size == 0 && result == NULL) || (G1_ALLOC_REGION_TRACING > 1)) {
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    const size_t buffer_length = 128;
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    char hr_buffer[buffer_length];
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    char rest_buffer[buffer_length];
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    HeapRegion* alloc_region = _alloc_region;
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    if (alloc_region == NULL) {
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      jio_snprintf(hr_buffer, buffer_length, "NULL");
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    } else if (alloc_region == _dummy_region) {
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      jio_snprintf(hr_buffer, buffer_length, "DUMMY");
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    } else {
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      jio_snprintf(hr_buffer, buffer_length,
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                   HR_FORMAT, HR_FORMAT_PARAMS(alloc_region));
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    }
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    if (G1_ALLOC_REGION_TRACING > 1) {
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      if (result != NULL) {
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        jio_snprintf(rest_buffer, buffer_length, "min " SIZE_FORMAT " desired " SIZE_FORMAT " actual " SIZE_FORMAT " " PTR_FORMAT,
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                     min_word_size, desired_word_size, actual_word_size, result);
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      } else if (min_word_size != 0) {
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        jio_snprintf(rest_buffer, buffer_length, "min " SIZE_FORMAT " desired " SIZE_FORMAT, min_word_size, desired_word_size);
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      } else {
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        jio_snprintf(rest_buffer, buffer_length, "");
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      }
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    } else {
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      jio_snprintf(rest_buffer, buffer_length, "");
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    }
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    tty->print_cr("[%s] %u %s : %s %s",
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                  _name, _count, hr_buffer, str, rest_buffer);
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  }
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}
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#endif // G1_ALLOC_REGION_TRACING
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G1AllocRegion::G1AllocRegion(const char* name,
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                             bool bot_updates)
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  : _name(name), _bot_updates(bot_updates),
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    _alloc_region(NULL), _count(0), _used_bytes_before(0),
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    _allocation_context(AllocationContext::system()) { }
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   251
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HeapRegion* MutatorAllocRegion::allocate_new_region(size_t word_size,
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                                                    bool force) {
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  return _g1h->new_mutator_alloc_region(word_size, force);
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}
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void MutatorAllocRegion::retire_region(HeapRegion* alloc_region,
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                                       size_t allocated_bytes) {
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  _g1h->retire_mutator_alloc_region(alloc_region, allocated_bytes);
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}
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HeapRegion* G1GCAllocRegion::allocate_new_region(size_t word_size,
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                                                 bool force) {
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  assert(!force, "not supported for GC alloc regions");
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  return _g1h->new_gc_alloc_region(word_size, count(), _purpose);
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}
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void G1GCAllocRegion::retire_region(HeapRegion* alloc_region,
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                                    size_t allocated_bytes) {
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  _g1h->retire_gc_alloc_region(alloc_region, allocated_bytes, _purpose);
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}
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size_t G1GCAllocRegion::retire(bool fill_up) {
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  HeapRegion* retired = get();
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  size_t end_waste = G1AllocRegion::retire(fill_up);
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  // Do not count retirement of the dummy allocation region.
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  if (retired != NULL) {
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    _stats->add_region_end_waste(end_waste / HeapWordSize);
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  }
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  return end_waste;
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}
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HeapRegion* OldGCAllocRegion::release() {
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  HeapRegion* cur = get();
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  if (cur != NULL) {
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    // Determine how far we are from the next card boundary. If it is smaller than
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    // the minimum object size we can allocate into, expand into the next card.
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    HeapWord* top = cur->top();
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    HeapWord* aligned_top = (HeapWord*)align_ptr_up(top, G1BlockOffsetSharedArray::N_bytes);
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    size_t to_allocate_words = pointer_delta(aligned_top, top, HeapWordSize);
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    if (to_allocate_words != 0) {
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      // We are not at a card boundary. Fill up, possibly into the next, taking the
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      // end of the region and the minimum object size into account.
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      to_allocate_words = MIN2(pointer_delta(cur->end(), cur->top(), HeapWordSize),
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                               MAX2(to_allocate_words, G1CollectedHeap::min_fill_size()));
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      // Skip allocation if there is not enough space to allocate even the smallest
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      // possible object. In this case this region will not be retained, so the
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      // original problem cannot occur.
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      if (to_allocate_words >= G1CollectedHeap::min_fill_size()) {
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        HeapWord* dummy = attempt_allocation(to_allocate_words, true /* bot_updates */);
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        CollectedHeap::fill_with_object(dummy, to_allocate_words);
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      }
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    }
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  }
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  return G1AllocRegion::release();
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}