view src/share/vm/gc_implementation/g1/g1AllocRegion.inline.hpp @ 2981:2ace1c4ee8da

6888336: G1: avoid explicitly marking and pushing objects in survivor spaces Summary: This change simplifies the interaction between GC and concurrent marking. By disabling survivor spaces during the initial-mark pause we don't need to propagate marks of objects we copy during each GC (since we never need to copy an explicitly marked object). Reviewed-by: johnc, brutisso
author tonyp
date Tue, 10 Jan 2012 18:58:13 -0500
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/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP

#include "gc_implementation/g1/g1AllocRegion.hpp"

inline HeapWord* G1AllocRegion::allocate(HeapRegion* alloc_region,
                                         size_t word_size,
                                         bool bot_updates) {
  assert(alloc_region != NULL, err_msg("pre-condition"));

  if (!bot_updates) {
    return alloc_region->allocate_no_bot_updates(word_size);
  } else {
    return alloc_region->allocate(word_size);
  }
}

inline HeapWord* G1AllocRegion::par_allocate(HeapRegion* alloc_region,
                                             size_t word_size,
                                             bool bot_updates) {
  assert(alloc_region != NULL, err_msg("pre-condition"));
  assert(!alloc_region->is_empty(), err_msg("pre-condition"));

  if (!bot_updates) {
    return alloc_region->par_allocate_no_bot_updates(word_size);
  } else {
    return alloc_region->par_allocate(word_size);
  }
}

inline HeapWord* G1AllocRegion::attempt_allocation(size_t word_size,
                                                   bool bot_updates) {
  assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));

  HeapRegion* alloc_region = _alloc_region;
  assert(alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));

  HeapWord* result = par_allocate(alloc_region, word_size, bot_updates);
  if (result != NULL) {
    trace("alloc", word_size, result);
    return result;
  }
  trace("alloc failed", word_size);
  return NULL;
}

inline HeapWord* G1AllocRegion::attempt_allocation_locked(size_t word_size,
                                                          bool bot_updates) {
  // First we have to tedo the allocation, assuming we're holding the
  // appropriate lock, in case another thread changed the region while
  // we were waiting to get the lock.
  HeapWord* result = attempt_allocation(word_size, bot_updates);
  if (result != NULL) {
    return result;
  }

  retire(true /* fill_up */);
  result = new_alloc_region_and_allocate(word_size, false /* force */);
  if (result != NULL) {
    trace("alloc locked (second attempt)", word_size, result);
    return result;
  }
  trace("alloc locked failed", word_size);
  return NULL;
}

inline HeapWord* G1AllocRegion::attempt_allocation_force(size_t word_size,
                                                         bool bot_updates) {
  assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));
  assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));

  trace("forcing alloc");
  HeapWord* result = new_alloc_region_and_allocate(word_size, true /* force */);
  if (result != NULL) {
    trace("alloc forced", word_size, result);
    return result;
  }
  trace("alloc forced failed", word_size);
  return NULL;
}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP