1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp Fri Nov 01 17:09:38 2013 +0100
1.3 @@ -0,0 +1,84 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "gc_implementation/parallelScavenge/generationSizer.hpp"
1.30 +#include "memory/collectorPolicy.hpp"
1.31 +
1.32 +void GenerationSizer::trace_gen_sizes(const char* const str) {
1.33 + if (TracePageSizes) {
1.34 + tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " "
1.35 + SIZE_FORMAT "," SIZE_FORMAT " "
1.36 + SIZE_FORMAT,
1.37 + str,
1.38 + _min_gen1_size / K, _max_gen1_size / K,
1.39 + _min_gen0_size / K, _max_gen0_size / K,
1.40 + _max_heap_byte_size / K);
1.41 + }
1.42 +}
1.43 +
1.44 +void GenerationSizer::initialize_alignments() {
1.45 + _space_alignment = _gen_alignment = default_gen_alignment();
1.46 + _heap_alignment = compute_heap_alignment();
1.47 +}
1.48 +
1.49 +void GenerationSizer::initialize_flags() {
1.50 + // Do basic sizing work
1.51 + TwoGenerationCollectorPolicy::initialize_flags();
1.52 +
1.53 + assert(UseSerialGC ||
1.54 + !FLAG_IS_DEFAULT(ParallelGCThreads) ||
1.55 + (ParallelGCThreads > 0),
1.56 + "ParallelGCThreads should be set before flag initialization");
1.57 +
1.58 + // The survivor ratio's are calculated "raw", unlike the
1.59 + // default gc, which adds 2 to the ratio value. We need to
1.60 + // make sure the values are valid before using them.
1.61 + if (MinSurvivorRatio < 3) {
1.62 + FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3);
1.63 + }
1.64 +
1.65 + if (InitialSurvivorRatio < 3) {
1.66 + FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3);
1.67 + }
1.68 +}
1.69 +
1.70 +void GenerationSizer::initialize_size_info() {
1.71 + trace_gen_sizes("ps heap raw");
1.72 + const size_t page_sz = os::page_size_for_region(_min_heap_byte_size,
1.73 + _max_heap_byte_size,
1.74 + 8);
1.75 +
1.76 + // Can a page size be something else than a power of two?
1.77 + assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2");
1.78 + size_t new_alignment = round_to(page_sz, _gen_alignment);
1.79 + if (new_alignment != _gen_alignment) {
1.80 + _gen_alignment = new_alignment;
1.81 + // Redo everything from the start
1.82 + initialize_flags();
1.83 + }
1.84 + TwoGenerationCollectorPolicy::initialize_size_info();
1.85 +
1.86 + trace_gen_sizes("ps heap rnd");
1.87 +}
