jdk8-mips64-public/hotspot: src/share/vm/memory/defNewGeneration.inline.hpp@a61af66fc99e

     1 /*

     2  * Copyright 2001-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 CompactibleSpace* DefNewGeneration::first_compaction_space() const {

    26   return eden();

    27 }

    29 HeapWord* DefNewGeneration::allocate(size_t word_size,

    30                                      bool is_tlab) {

    31   // This is the slow-path allocation for the DefNewGeneration.

    32   // Most allocations are fast-path in compiled code.

    33   // We try to allocate from the eden.  If that works, we are happy.

    34   // Note that since DefNewGeneration supports lock-free allocation, we

    35   // have to use it here, as well.

    36   HeapWord* result = eden()->par_allocate(word_size);

    37   if (result != NULL) {

    38     return result;

    39   }

    40   do {

    41     HeapWord* old_limit = eden()->soft_end();

    42     if (old_limit < eden()->end()) {

    43       // Tell the next generation we reached a limit.

    44       HeapWord* new_limit =

    45         next_gen()->allocation_limit_reached(eden(), eden()->top(), word_size);

    46       if (new_limit != NULL) {

    47         Atomic::cmpxchg_ptr(new_limit, eden()->soft_end_addr(), old_limit);

    48       } else {

    49         assert(eden()->soft_end() == eden()->end(),

    50                "invalid state after allocation_limit_reached returned null");

    51       }

    52     } else {

    53       // The allocation failed and the soft limit is equal to the hard limit,

    54       // there are no reasons to do an attempt to allocate

    55       assert(old_limit == eden()->end(), "sanity check");

    56       break;

    57     }

    58     // Try to allocate until succeeded or the soft limit can't be adjusted

    59     result = eden()->par_allocate(word_size);

    60   } while (result == NULL);

    62   // If the eden is full and the last collection bailed out, we are running

    63   // out of heap space, and we try to allocate the from-space, too.

    64   // allocate_from_space can't be inlined because that would introduce a

    65   // circular dependency at compile time.

    66   if (result == NULL) {

    67     result = allocate_from_space(word_size);

    68   }

    69   return result;

    70 }

    72 HeapWord* DefNewGeneration::par_allocate(size_t word_size,

    73                                          bool is_tlab) {

    74   return eden()->par_allocate(word_size);

    75 }

    77 void DefNewGeneration::gc_prologue(bool full) {

    78   // Ensure that _end and _soft_end are the same in eden space.

    79   eden()->set_soft_end(eden()->end());

    80 }

    82 size_t DefNewGeneration::tlab_capacity() const {

    83   return eden()->capacity();

    84 }

    86 size_t DefNewGeneration::unsafe_max_tlab_alloc() const {

    87   return unsafe_max_alloc_nogc();

    88 }

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