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src/share/vm/gc_implementation/shared/ageTable.cpp@097d78aaf2b5 (annotated)

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

Thu, 04 Oct 2012 10:40:23 -0700

author

jmasa

date

Thu, 04 Oct 2012 10:40:23 -0700

changeset 4131

097d78aaf2b5

parent 4129

22b8d3d181d9

child 4465

203f64878aab

permissions

-rw-r--r--

7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
Reviewed-by: johnc, mgerdin, jwilhelm

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "gc_implementation/shared/ageTable.hpp"
stefank@2314	27	#include "gc_implementation/shared/gcPolicyCounters.hpp"
stefank@2314	28	#include "memory/collectorPolicy.hpp"
stefank@2314	29	#include "memory/resourceArea.hpp"
stefank@2314	30	#include "memory/sharedHeap.hpp"
stefank@2314	31	#include "utilities/copy.hpp"
stefank@2314	32
trims@1907	33	/* Copyright (c) 1992-2009 Oracle and/or its affiliates, and Stanford University.
duke@435	34	See the LICENSE file for license information. */
duke@435	35
duke@435	36	ageTable::ageTable(bool global) {
duke@435	37
duke@435	38	clear();
duke@435	39
duke@435	40	if (UsePerfData && global) {
duke@435	41
duke@435	42	ResourceMark rm;
duke@435	43	EXCEPTION_MARK;
duke@435	44
duke@435	45	const char* agetable_ns = "generation.0.agetable";
duke@435	46	const char* bytes_ns = PerfDataManager::name_space(agetable_ns, "bytes");
duke@435	47
duke@435	48	for(int age = 0; age < table_size; age ++) {
duke@435	49	char age_name[10];
duke@435	50	jio_snprintf(age_name, sizeof(age_name), "%2.2d", age);
duke@435	51	const char* cname = PerfDataManager::counter_name(bytes_ns, age_name);
duke@435	52	_perf_sizes[age] = PerfDataManager::create_variable(SUN_GC, cname,
duke@435	53	PerfData::U_Bytes,
duke@435	54	CHECK);
duke@435	55	}
duke@435	56
duke@435	57	const char* cname = PerfDataManager::counter_name(agetable_ns, "size");
duke@435	58	PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
duke@435	59	table_size, CHECK);
duke@435	60	}
duke@435	61	}
duke@435	62
duke@435	63	void ageTable::clear() {
duke@435	64	for (size_t* p = sizes; p < sizes + table_size; ++p) {
duke@435	65	*p = 0;
duke@435	66	}
duke@435	67	}
duke@435	68
duke@435	69	void ageTable::merge(ageTable* subTable) {
duke@435	70	for (int i = 0; i < table_size; i++) {
duke@435	71	sizes[i]+= subTable->sizes[i];
duke@435	72	}
duke@435	73	}
duke@435	74
apetrusenko@980	75	void ageTable::merge_par(ageTable* subTable) {
apetrusenko@980	76	for (int i = 0; i < table_size; i++) {
apetrusenko@980	77	Atomic::add_ptr(subTable->sizes[i], &sizes[i]);
apetrusenko@980	78	}
apetrusenko@980	79	}
apetrusenko@980	80
jwilhelm@4129	81	uint ageTable::compute_tenuring_threshold(size_t survivor_capacity) {
duke@435	82	size_t desired_survivor_size = (size_t)((((double) survivor_capacity)*TargetSurvivorRatio)/100);
duke@435	83	size_t total = 0;
jwilhelm@4129	84	uint age = 1;
duke@435	85	assert(sizes[0] == 0, "no objects with age zero should be recorded");
duke@435	86	while (age < table_size) {
duke@435	87	total += sizes[age];
duke@435	88	// check if including objects of age 'age' made us pass the desired
duke@435	89	// size, if so 'age' is the new threshold
duke@435	90	if (total > desired_survivor_size) break;
duke@435	91	age++;
duke@435	92	}
jwilhelm@4129	93	uint result = age < MaxTenuringThreshold ? age : MaxTenuringThreshold;
duke@435	94
duke@435	95	if (PrintTenuringDistribution || UsePerfData) {
duke@435	96
duke@435	97	if (PrintTenuringDistribution) {
duke@435	98	gclog_or_tty->cr();
jwilhelm@4129	99	gclog_or_tty->print_cr("Desired survivor size %ld bytes, new threshold %u (max %u)",
duke@435	100	desired_survivor_size*oopSize, result, MaxTenuringThreshold);
duke@435	101	}
duke@435	102
duke@435	103	total = 0;
duke@435	104	age = 1;
duke@435	105	while (age < table_size) {
duke@435	106	total += sizes[age];
duke@435	107	if (sizes[age] > 0) {
duke@435	108	if (PrintTenuringDistribution) {
jwilhelm@4129	109	gclog_or_tty->print_cr("- age %3u: %10ld bytes, %10ld total",
duke@435	110	age, sizes[age]*oopSize, total*oopSize);
duke@435	111	}
duke@435	112	}
duke@435	113	if (UsePerfData) {
duke@435	114	_perf_sizes[age]->set_value(sizes[age]*oopSize);
duke@435	115	}
duke@435	116	age++;
duke@435	117	}
duke@435	118	if (UsePerfData) {
duke@435	119	SharedHeap* sh = SharedHeap::heap();
duke@435	120	CollectorPolicy* policy = sh->collector_policy();
duke@435	121	GCPolicyCounters* gc_counters = policy->counters();
duke@435	122	gc_counters->tenuring_threshold()->set_value(result);
duke@435	123	gc_counters->desired_survivor_size()->set_value(
duke@435	124	desired_survivor_size*oopSize);
duke@435	125	}
duke@435	126	}
duke@435	127
duke@435	128	return result;
duke@435	129	}