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src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp@04ff2f6cd0eb (annotated)

src/share/vm/gc_implementation/parallelScavenge/generationSizer.cpp

Tue, 17 Oct 2017 12:58:25 +0800

author

aoqi

date

Tue, 17 Oct 2017 12:58:25 +0800

changeset 7994

04ff2f6cd0eb

parent 7780

5788dbd1f2d6

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "gc_implementation/parallelScavenge/generationSizer.hpp"
aoqi@0	27	#include "memory/collectorPolicy.hpp"
aoqi@0	28
aoqi@0	29	void GenerationSizer::trace_gen_sizes(const char* const str) {
aoqi@0	30	if (TracePageSizes) {
aoqi@0	31	tty->print_cr("%s: " SIZE_FORMAT "," SIZE_FORMAT " "
aoqi@0	32	SIZE_FORMAT "," SIZE_FORMAT " "
aoqi@0	33	SIZE_FORMAT,
aoqi@0	34	str,
aoqi@0	35	_min_gen1_size / K, _max_gen1_size / K,
aoqi@0	36	_min_gen0_size / K, _max_gen0_size / K,
aoqi@0	37	_max_heap_byte_size / K);
aoqi@0	38	}
aoqi@0	39	}
aoqi@0	40
aoqi@0	41	void GenerationSizer::initialize_alignments() {
aoqi@0	42	_space_alignment = _gen_alignment = default_gen_alignment();
aoqi@0	43	_heap_alignment = compute_heap_alignment();
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	void GenerationSizer::initialize_flags() {
aoqi@0	47	// Do basic sizing work
aoqi@0	48	TwoGenerationCollectorPolicy::initialize_flags();
aoqi@0	49
aoqi@0	50	assert(UseSerialGC ||
aoqi@0	51	!FLAG_IS_DEFAULT(ParallelGCThreads) ||
aoqi@0	52	(ParallelGCThreads > 0),
aoqi@0	53	"ParallelGCThreads should be set before flag initialization");
aoqi@0	54
aoqi@0	55	// The survivor ratio's are calculated "raw", unlike the
aoqi@0	56	// default gc, which adds 2 to the ratio value. We need to
aoqi@0	57	// make sure the values are valid before using them.
aoqi@0	58	if (MinSurvivorRatio < 3) {
aoqi@0	59	FLAG_SET_ERGO(uintx, MinSurvivorRatio, 3);
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	if (InitialSurvivorRatio < 3) {
aoqi@0	63	FLAG_SET_ERGO(uintx, InitialSurvivorRatio, 3);
aoqi@0	64	}
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	void GenerationSizer::initialize_size_info() {
aoqi@0	68	trace_gen_sizes("ps heap raw");
ehelin@7780	69	const size_t max_page_sz = os::page_size_for_region_aligned(_max_heap_byte_size, 8);
ehelin@7778	70	const size_t min_pages = 4; // 1 for eden + 1 for each survivor + 1 for old
ehelin@7780	71	const size_t min_page_sz = os::page_size_for_region_aligned(_min_heap_byte_size, min_pages);
ehelin@7778	72	const size_t page_sz = MIN2(max_page_sz, min_page_sz);
aoqi@0	73
aoqi@0	74	// Can a page size be something else than a power of two?
aoqi@0	75	assert(is_power_of_2((intptr_t)page_sz), "must be a power of 2");
aoqi@0	76	size_t new_alignment = round_to(page_sz, _gen_alignment);
aoqi@0	77	if (new_alignment != _gen_alignment) {
aoqi@0	78	_gen_alignment = new_alignment;
aoqi@0	79	_space_alignment = new_alignment;
aoqi@0	80	// Redo everything from the start
aoqi@0	81	initialize_flags();
aoqi@0	82	}
aoqi@0	83	TwoGenerationCollectorPolicy::initialize_size_info();
aoqi@0	84
aoqi@0	85	trace_gen_sizes("ps heap rnd");
aoqi@0	86	}