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src/share/vm/memory/sharedHeap.cpp@8c95980d0b66 (annotated)

src/share/vm/memory/sharedHeap.cpp

Sat, 07 Nov 2020 10:30:02 +0800

author

aoqi

date

Sat, 07 Nov 2020 10:30:02 +0800

changeset 10026

8c95980d0b66

parent 7994

04ff2f6cd0eb

permissions

-rw-r--r--

Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2000, 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 "classfile/symbolTable.hpp"
aoqi@0	27	#include "classfile/systemDictionary.hpp"
aoqi@0	28	#include "code/codeCache.hpp"
aoqi@0	29	#include "gc_interface/collectedHeap.inline.hpp"
aoqi@0	30	#include "memory/sharedHeap.hpp"
aoqi@0	31	#include "oops/oop.inline.hpp"
stefank@6992	32	#include "runtime/atomic.inline.hpp"
aoqi@0	33	#include "runtime/fprofiler.hpp"
aoqi@0	34	#include "runtime/java.hpp"
aoqi@0	35	#include "utilities/copy.hpp"
aoqi@0	36	#include "utilities/workgroup.hpp"
aoqi@0	37
aoqi@0	38	PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
aoqi@0	39
aoqi@0	40	SharedHeap* SharedHeap::_sh;
aoqi@0	41
aoqi@0	42	SharedHeap::SharedHeap(CollectorPolicy* policy_) :
aoqi@0	43	CollectedHeap(),
aoqi@0	44	_collector_policy(policy_),
aoqi@0	45	_rem_set(NULL),
aoqi@0	46	_strong_roots_parity(0),
aoqi@0	47	_workers(NULL)
aoqi@0	48	{
aoqi@0	49	_sh = this; // ch is static, should be set only once.
aoqi@0	50	if ((UseParNewGC ||
aoqi@0	51	(UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled ||
aoqi@0	52	CMSParallelRemarkEnabled)) ||
aoqi@0	53	UseG1GC) &&
aoqi@0	54	ParallelGCThreads > 0) {
aoqi@0	55	_workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
aoqi@0	56	/* are_GC_task_threads */true,
aoqi@0	57	/* are_ConcurrentGC_threads */false);
aoqi@0	58	if (_workers == NULL) {
aoqi@0	59	vm_exit_during_initialization("Failed necessary allocation.");
aoqi@0	60	} else {
aoqi@0	61	_workers->initialize_workers();
aoqi@0	62	}
aoqi@0	63	}
aoqi@0	64	}
aoqi@0	65
aoqi@0	66	bool SharedHeap::heap_lock_held_for_gc() {
aoqi@0	67	Thread* t = Thread::current();
aoqi@0	68	return Heap_lock->owned_by_self()
aoqi@0	69	|| ( (t->is_GC_task_thread() || t->is_VM_thread())
aoqi@0	70	&& _thread_holds_heap_lock_for_gc);
aoqi@0	71	}
aoqi@0	72
aoqi@0	73	void SharedHeap::set_par_threads(uint t) {
aoqi@0	74	assert(t == 0 || !UseSerialGC, "Cannot have parallel threads");
aoqi@0	75	_n_par_threads = t;
stefank@6992	76	}
stefank@6992	77
aoqi@0	78	void SharedHeap::change_strong_roots_parity() {
aoqi@0	79	// Also set the new collection parity.
aoqi@0	80	assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2,
aoqi@0	81	"Not in range.");
aoqi@0	82	_strong_roots_parity++;
aoqi@0	83	if (_strong_roots_parity == 3) _strong_roots_parity = 1;
aoqi@0	84	assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2,
aoqi@0	85	"Not in range.");
aoqi@0	86	}
aoqi@0	87
stefank@6992	88	SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* heap, bool activate)
mgerdin@7659	89	: MarkScope(activate), _sh(heap)
aoqi@0	90	{
aoqi@0	91	if (_active) {
stefank@6992	92	_sh->change_strong_roots_parity();
aoqi@0	93	// Zero the claimed high water mark in the StringTable
aoqi@0	94	StringTable::clear_parallel_claimed_index();
aoqi@0	95	}
aoqi@0	96	}
aoqi@0	97
aoqi@0	98	void SharedHeap::set_barrier_set(BarrierSet* bs) {
aoqi@0	99	_barrier_set = bs;
aoqi@0	100	// Cached barrier set for fast access in oops
aoqi@0	101	oopDesc::set_bs(bs);
aoqi@0	102	}
aoqi@0	103
aoqi@0	104	void SharedHeap::post_initialize() {
aoqi@0	105	CollectedHeap::post_initialize();
aoqi@0	106	ref_processing_init();
aoqi@0	107	}
aoqi@0	108
aoqi@0	109	void SharedHeap::ref_processing_init() {}
aoqi@0	110
aoqi@0	111	// Some utilities.
aoqi@0	112	void SharedHeap::print_size_transition(outputStream* out,
aoqi@0	113	size_t bytes_before,
aoqi@0	114	size_t bytes_after,
aoqi@0	115	size_t capacity) {
aoqi@0	116	out->print(" %d%s->%d%s(%d%s)",
aoqi@0	117	byte_size_in_proper_unit(bytes_before),
aoqi@0	118	proper_unit_for_byte_size(bytes_before),
aoqi@0	119	byte_size_in_proper_unit(bytes_after),
aoqi@0	120	proper_unit_for_byte_size(bytes_after),
aoqi@0	121	byte_size_in_proper_unit(capacity),
aoqi@0	122	proper_unit_for_byte_size(capacity));
aoqi@0	123	}