jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/markSweep.cpp@55a0da3d420b (annotated)

src/share/vm/gc_implementation/shared/markSweep.cpp@55a0da3d420b (annotated)

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

Tue, 26 Nov 2013 14:35:38 +0100

author: sjohanss
date: Tue, 26 Nov 2013 14:35:38 +0100
changeset 6148: 55a0da3d420b
parent 5237: f2110083203d
child 6680: 78bbf4d43a14
permissions: -rw-r--r--

8027675: Full collections with Serial slower in JDK 8 compared to 7u40
Summary: Reduced the number of calls to follow_class_loader and instead marked and pushed the klass holder directly. Also removed unneeded calls to adjust_klass.
Reviewed-by: coleenp, jmasa, mgerdin, tschatzl

 /*
  * 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/gcTimer.hpp"
 #include "gc_implementation/shared/gcTrace.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;
 STWGCTimer*             MarkSweep::_gc_timer        = NULL;
 SerialOldTracer*        MarkSweep::_gc_tracer       = 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_class_loader(ClassLoaderData* cld) {
   cld->oops_do(&MarkSweep::mark_and_push_closure, &MarkSweep::follow_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() {
   MarkSweep::_gc_timer = new (ResourceObj::C_HEAP, mtGC) STWGCTimer();
   MarkSweep::_gc_tracer = new (ResourceObj::C_HEAP, mtGC) SerialOldTracer();
 }
 #ifndef PRODUCT
 void MarkSweep::trace(const char* msg) {
   if (TraceMarkSweep)
     gclog_or_tty->print("%s", msg);
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/shared/markSweep.cpp@55a0da3d420b (annotated)

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