jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp@5788dbd1f2d6

8066875: VirtualSpace does not use large pages
Reviewed-by: stefank, tschatzl, anoll, thartmann

     1 /*

     2  * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp"

    26 #include "gc_implementation/parallelScavenge/generationSizer.hpp"

    27 #include "memory/collectorPolicy.hpp"

    29 void GenerationSizer::trace_gen_sizes(const char* const str) {

    30   if (TracePageSizes) {

    31     tty->print_cr("%s:  " SIZE_FORMAT "," SIZE_FORMAT " "

    32                   SIZE_FORMAT "," SIZE_FORMAT " "

    33                   SIZE_FORMAT,

    34                   str,

    35                   _min_gen1_size / K, _max_gen1_size / K,

    36                   _min_gen0_size / K, _max_gen0_size / K,

    37                   _max_heap_byte_size / K);

    38   }

    39 }

    41 void GenerationSizer::initialize_alignments() {

    42   _space_alignment = _gen_alignment = default_gen_alignment();

    43   _heap_alignment = compute_heap_alignment();

    44 }

    46 void GenerationSizer::initialize_flags() {

    47   // Do basic sizing work

    48   TwoGenerationCollectorPolicy::initialize_flags();

    50   assert(UseSerialGC ||

    51           !FLAG_IS_DEFAULT(ParallelGCThreads) ||

    52           (ParallelGCThreads > 0),

    53          "ParallelGCThreads should be set before flag initialization");

    55   // The survivor ratio's are calculated "raw", unlike the

    56   // default gc, which adds 2 to the ratio value. We need to

    57   // make sure the values are valid before using them.

    58   if (MinSurvivorRatio < 3) {

    59     FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3);

    60   }

    62   if (InitialSurvivorRatio < 3) {

    63     FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3);

    64   }

    65 }

    67 void GenerationSizer::initialize_size_info() {

    68   trace_gen_sizes("ps heap raw");

    69   const size_t max_page_sz = os::page_size_for_region_aligned(_max_heap_byte_size, 8);

    70   const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old

    71   const size_t min_page_sz = os::page_size_for_region_aligned(_min_heap_byte_size, min_pages);

    72   const size_t page_sz = MIN2(max_page_sz, min_page_sz);

    74   // Can a page size be something else than a power of two?

    75   assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2");

    76   size_t new_alignment = round_to(page_sz, _gen_alignment);

    77   if (new_alignment != _gen_alignment) {

    78     _gen_alignment = new_alignment;

    79     _space_alignment = new_alignment;

    80     // Redo everything from the start

    81     initialize_flags();

    82   }

    83   TwoGenerationCollectorPolicy::initialize_size_info();

    85   trace_gen_sizes("ps heap rnd");

    86 }

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