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src/share/vm/gc_implementation/shared/ageTable.cpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/shared/ageTable.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2014, 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/shared/ageTable.hpp"
aoqi@0	27	#include "gc_implementation/shared/gcPolicyCounters.hpp"
aoqi@0	28	#include "memory/collectorPolicy.hpp"
aoqi@0	29	#include "memory/resourceArea.hpp"
aoqi@0	30	#include "memory/sharedHeap.hpp"
aoqi@0	31	#include "utilities/copy.hpp"
aoqi@0	32
aoqi@0	33	/* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
aoqi@0	34	See the LICENSE file for license information. */
aoqi@0	35
aoqi@0	36	ageTable::ageTable(bool global) {
aoqi@0	37
aoqi@0	38	clear();
aoqi@0	39
aoqi@0	40	if (UsePerfData && global) {
aoqi@0	41
aoqi@0	42	ResourceMark rm;
aoqi@0	43	EXCEPTION_MARK;
aoqi@0	44
aoqi@0	45	const char* agetable_ns = "generation.0.agetable";
aoqi@0	46	const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
aoqi@0	47
aoqi@0	48	for(int age = 0; age < table_size; age ++) {
aoqi@0	49	char age_name[10];
aoqi@0	50	jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
aoqi@0	51	const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
aoqi@0	52	_perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
aoqi@0	53	PerfData::U_Bytes,
aoqi@0	54	CHECK);
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
aoqi@0	58	PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
aoqi@0	59	table_size, CHECK);
aoqi@0	60	}
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	void ageTable::clear() {
aoqi@0	64	for (size_t* p = sizes; p < sizes + table_size; ++p) {
aoqi@0	65	*p = 0;
aoqi@0	66	}
aoqi@0	67	}
aoqi@0	68
aoqi@0	69	void ageTable::merge(ageTable* subTable) {
aoqi@0	70	for (int i = 0; i < table_size; i++) {
aoqi@0	71	sizes[i]+= subTable->sizes[i];
aoqi@0	72	}
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	void ageTable::merge_par(ageTable* subTable) {
aoqi@0	76	for (int i = 0; i < table_size; i++) {
aoqi@0	77	Atomic::add_ptr(subTable->sizes[i], &sizes[i]);
aoqi@0	78	}
aoqi@0	79	}
aoqi@0	80
aoqi@0	81	uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
aoqi@0	82	size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
aoqi@0	83	size_t total = 0;
aoqi@0	84	uint age = 1;
aoqi@0	85	assert(sizes[0] == 0, "no objects with age zero should be recorded");
aoqi@0	86	while (age < table_size) {
aoqi@0	87	total += sizes[age];
aoqi@0	88	// check if including objects of age 'age' made us pass the desired
aoqi@0	89	// size, if so 'age' is the new threshold
aoqi@0	90	if (total > desired_survivor_size) break;
aoqi@0	91	age++;
aoqi@0	92	}
aoqi@0	93	uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
aoqi@0	94
aoqi@0	95	if (PrintTenuringDistribution || UsePerfData) {
aoqi@0	96
aoqi@0	97	if (PrintTenuringDistribution) {
aoqi@0	98	gclog_or_tty->cr();
aoqi@0	99	gclog_or_tty->print_cr("Desired survivor size " SIZE_FORMAT " bytes, new threshold %u (max %u)",
aoqi@0	100	desired_survivor_size*oopSize, result, (int) MaxTenuringThreshold);
aoqi@0	101	}
aoqi@0	102
aoqi@0	103	total = 0;
aoqi@0	104	age = 1;
aoqi@0	105	while (age < table_size) {
aoqi@0	106	total += sizes[age];
aoqi@0	107	if (sizes[age] > 0) {
aoqi@0	108	if (PrintTenuringDistribution) {
aoqi@0	109	gclog_or_tty->print_cr("- age %3u: " SIZE_FORMAT_W(10) " bytes, " SIZE_FORMAT_W(10) " total",
aoqi@0	110	age, sizes[age]*oopSize, total*oopSize);
aoqi@0	111	}
aoqi@0	112	}
aoqi@0	113	if (UsePerfData) {
aoqi@0	114	_perf_sizes[age]->set_value(sizes[age]*oopSize);
aoqi@0	115	}
aoqi@0	116	age++;
aoqi@0	117	}
aoqi@0	118	if (UsePerfData) {
aoqi@0	119	SharedHeap* sh = SharedHeap::heap();
aoqi@0	120	CollectorPolicy* policy = sh->collector_policy();
aoqi@0	121	GCPolicyCounters* gc_counters = policy->counters();
aoqi@0	122	gc_counters->tenuring_threshold()->set_value(result);
aoqi@0	123	gc_counters->desired_survivor_size()->set_value(
aoqi@0	124	desired_survivor_size*oopSize);
aoqi@0	125	}
aoqi@0	126	}
aoqi@0	127
aoqi@0	128	return result;
aoqi@0	129	}