jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1AllocRegion.inline.hpp@abdfc822206f

7023069: G1: Introduce symmetric locking in the slow allocation path
7023151: G1: refactor the code that operates on _cur_alloc_region to be re-used for allocs by the GC threads
7018286: G1: humongous allocation attempts should take the GC locker into account
Summary: First, this change replaces the asymmetric locking scheme in the G1 slow alloc path by a summetric one. Second, it factors out the code that operates on _cur_alloc_region so that it can be re-used for allocations by the GC threads in the future.
Reviewed-by: stefank, brutisso, johnc

     1 /*

     2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP

    28 #include "gc_implementation/g1/g1AllocRegion.hpp"

    30 inline HeapWord* G1AllocRegion::allocate(HeapRegion* alloc_region,

    31                                          size_t word_size,

    32                                          bool bot_updates) {

    33   assert(alloc_region != NULL, err_msg("pre-condition"));

    35   if (!bot_updates) {

    36     return alloc_region->allocate_no_bot_updates(word_size);

    37   } else {

    38     return alloc_region->allocate(word_size);

    39   }

    40 }

    42 inline HeapWord* G1AllocRegion::par_allocate(HeapRegion* alloc_region,

    43                                              size_t word_size,

    44                                              bool bot_updates) {

    45   assert(alloc_region != NULL, err_msg("pre-condition"));

    46   assert(!alloc_region->is_empty(), err_msg("pre-condition"));

    48   if (!bot_updates) {

    49     return alloc_region->par_allocate_no_bot_updates(word_size);

    50   } else {

    51     return alloc_region->par_allocate(word_size);

    52   }

    53 }

    55 inline HeapWord* G1AllocRegion::attempt_allocation(size_t word_size,

    56                                                    bool bot_updates) {

    57   assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));

    59   HeapRegion* alloc_region = _alloc_region;

    60   assert(alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));

    62   HeapWord* result = par_allocate(alloc_region, word_size, bot_updates);

    63   if (result != NULL) {

    64     trace("alloc", word_size, result);

    65     return result;

    66   }

    67   trace("alloc failed", word_size);

    68   return NULL;

    69 }

    71 inline HeapWord* G1AllocRegion::attempt_allocation_locked(size_t word_size,

    72                                                           bool bot_updates) {

    73   // First we have to tedo the allocation, assuming we're holding the

    74   // appropriate lock, in case another thread changed the region while

    75   // we were waiting to get the lock.

    76   HeapWord* result = attempt_allocation(word_size, bot_updates);

    77   if (result != NULL) {

    78     return result;

    79   }

    81   retire(true /* fill_up */);

    82   result = new_alloc_region_and_allocate(word_size, false /* force */);

    83   if (result != NULL) {

    84     trace("alloc locked (second attempt)", word_size, result);

    85     return result;

    86   }

    87   trace("alloc locked failed", word_size);

    88   return NULL;

    89 }

    91 inline HeapWord* G1AllocRegion::attempt_allocation_force(size_t word_size,

    92                                                          bool bot_updates) {

    93   assert(bot_updates == _bot_updates, ar_ext_msg(this, "pre-condition"));

    94   assert(_alloc_region != NULL, ar_ext_msg(this, "not initialized properly"));

    96   trace("forcing alloc");

    97   HeapWord* result = new_alloc_region_and_allocate(word_size, true /* force */);

    98   if (result != NULL) {

    99     trace("alloc forced", word_size, result);

   100     return result;

   101   }

   102   trace("alloc forced failed", word_size);

   103   return NULL;

   104 }

   106 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_INLINE_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/g1/g1AllocRegion.inline.hpp@abdfc822206f

src/share/vm/gc_implementation/g1/g1AllocRegion.inline.hpp