Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/shared/markSweep.cpp @ 10374:87c64c0438fb
6976350: G1: deal with fragmentation while copying objects during GC
Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency.
Reviewed-by: johnc, jmasa, brutisso
Contributed-by: tamao <tao.mao@oracle.com>
author | tamao |
---|---|
date | Mon, 03 Jun 2013 14:37:13 -0700 |
parents | 2138a2c14831 |
children | f2110083203d |
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/* * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "compiler/compileBroker.hpp" #include "gc_implementation/shared/markSweep.inline.hpp" #include "gc_interface/collectedHeap.inline.hpp" #include "oops/methodData.hpp" #include "oops/objArrayKlass.inline.hpp" #include "oops/oop.inline.hpp" uint MarkSweep::_total_invocations = 0; Stack<oop, mtGC> MarkSweep::_marking_stack; Stack<ObjArrayTask, mtGC> MarkSweep::_objarray_stack; Stack<oop, mtGC> MarkSweep::_preserved_oop_stack; Stack<markOop, mtGC> MarkSweep::_preserved_mark_stack; size_t MarkSweep::_preserved_count = 0; size_t MarkSweep::_preserved_count_max = 0; PreservedMark* MarkSweep::_preserved_marks = NULL; ReferenceProcessor* MarkSweep::_ref_processor = NULL; MarkSweep::FollowRootClosure MarkSweep::follow_root_closure; CodeBlobToOopClosure MarkSweep::follow_code_root_closure(&MarkSweep::follow_root_closure, /*do_marking=*/ true); void MarkSweep::FollowRootClosure::do_oop(oop* p) { follow_root(p); } void MarkSweep::FollowRootClosure::do_oop(narrowOop* p) { follow_root(p); } MarkSweep::MarkAndPushClosure MarkSweep::mark_and_push_closure; MarkSweep::FollowKlassClosure MarkSweep::follow_klass_closure; MarkSweep::AdjustKlassClosure MarkSweep::adjust_klass_closure; void MarkSweep::MarkAndPushClosure::do_oop(oop* p) { mark_and_push(p); } void MarkSweep::MarkAndPushClosure::do_oop(narrowOop* p) { mark_and_push(p); } void MarkSweep::FollowKlassClosure::do_klass(Klass* klass) { klass->oops_do(&MarkSweep::mark_and_push_closure); } void MarkSweep::AdjustKlassClosure::do_klass(Klass* klass) { klass->oops_do(&MarkSweep::adjust_pointer_closure); } void MarkSweep::follow_klass(Klass* klass) { ClassLoaderData* cld = klass->class_loader_data(); // The actual processing of the klass is done when we // traverse the list of Klasses in the class loader data. MarkSweep::follow_class_loader(cld); } void MarkSweep::adjust_klass(Klass* klass) { ClassLoaderData* cld = klass->class_loader_data(); // The actual processing of the klass is done when we // traverse the list of Klasses in the class loader data. MarkSweep::adjust_class_loader(cld); } void MarkSweep::follow_class_loader(ClassLoaderData* cld) { cld->oops_do(&MarkSweep::mark_and_push_closure, &MarkSweep::follow_klass_closure, true); } void MarkSweep::adjust_class_loader(ClassLoaderData* cld) { cld->oops_do(&MarkSweep::adjust_pointer_closure, &MarkSweep::adjust_klass_closure, true); } void MarkSweep::follow_stack() { do { while (!_marking_stack.is_empty()) { oop obj = _marking_stack.pop(); assert (obj->is_gc_marked(), "p must be marked"); obj->follow_contents(); } // Process ObjArrays one at a time to avoid marking stack bloat. if (!_objarray_stack.is_empty()) { ObjArrayTask task = _objarray_stack.pop(); ObjArrayKlass* k = (ObjArrayKlass*)task.obj()->klass(); k->oop_follow_contents(task.obj(), task.index()); } } while (!_marking_stack.is_empty() || !_objarray_stack.is_empty()); } MarkSweep::FollowStackClosure MarkSweep::follow_stack_closure; void MarkSweep::FollowStackClosure::do_void() { follow_stack(); } // We preserve the mark which should be replaced at the end and the location // that it will go. Note that the object that this markOop belongs to isn't // currently at that address but it will be after phase4 void MarkSweep::preserve_mark(oop obj, markOop mark) { // We try to store preserved marks in the to space of the new generation since // this is storage which should be available. Most of the time this should be // sufficient space for the marks we need to preserve but if it isn't we fall // back to using Stacks to keep track of the overflow. if (_preserved_count < _preserved_count_max) { _preserved_marks[_preserved_count++].init(obj, mark); } else { _preserved_mark_stack.push(mark); _preserved_oop_stack.push(obj); } } MarkSweep::AdjustPointerClosure MarkSweep::adjust_pointer_closure; void MarkSweep::AdjustPointerClosure::do_oop(oop* p) { adjust_pointer(p); } void MarkSweep::AdjustPointerClosure::do_oop(narrowOop* p) { adjust_pointer(p); } void MarkSweep::adjust_marks() { assert( _preserved_oop_stack.size() == _preserved_mark_stack.size(), "inconsistent preserved oop stacks"); // adjust the oops we saved earlier for (size_t i = 0; i < _preserved_count; i++) { _preserved_marks[i].adjust_pointer(); } // deal with the overflow stack StackIterator<oop, mtGC> iter(_preserved_oop_stack); while (!iter.is_empty()) { oop* p = iter.next_addr(); adjust_pointer(p); } } void MarkSweep::restore_marks() { assert(_preserved_oop_stack.size() == _preserved_mark_stack.size(), "inconsistent preserved oop stacks"); if (PrintGC && Verbose) { gclog_or_tty->print_cr("Restoring %d marks", _preserved_count + _preserved_oop_stack.size()); } // restore the marks we saved earlier for (size_t i = 0; i < _preserved_count; i++) { _preserved_marks[i].restore(); } // deal with the overflow while (!_preserved_oop_stack.is_empty()) { oop obj = _preserved_oop_stack.pop(); markOop mark = _preserved_mark_stack.pop(); obj->set_mark(mark); } } MarkSweep::IsAliveClosure MarkSweep::is_alive; bool MarkSweep::IsAliveClosure::do_object_b(oop p) { return p->is_gc_marked(); } MarkSweep::KeepAliveClosure MarkSweep::keep_alive; void MarkSweep::KeepAliveClosure::do_oop(oop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } void MarkSweep::KeepAliveClosure::do_oop(narrowOop* p) { MarkSweep::KeepAliveClosure::do_oop_work(p); } void marksweep_init() { /* empty */ } #ifndef PRODUCT void MarkSweep::trace(const char* msg) { if (TraceMarkSweep) gclog_or_tty->print("%s", msg); } #endif