rev 6670 : fast reclaim main patch

   1 /*
   2  * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
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  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
  27 
  28 #include "gc_implementation/g1/concurrentMark.inline.hpp"
  29 #include "gc_implementation/g1/g1CollectedHeap.hpp"
  30 #include "gc_implementation/g1/g1OopClosures.hpp"
  31 #include "gc_implementation/g1/g1ParScanThreadState.inline.hpp"
  32 #include "gc_implementation/g1/g1RemSet.hpp"
  33 #include "gc_implementation/g1/g1RemSet.inline.hpp"
  34 #include "gc_implementation/g1/heapRegionRemSet.hpp"
  35 #include "memory/iterator.inline.hpp"
  36 #include "runtime/prefetch.inline.hpp"
  37 
  38 /*
  39  * This really ought to be an inline function, but apparently the C++
  40  * compiler sometimes sees fit to ignore inline declarations.  Sigh.
  41  */
  42 
  43 template <class T>
  44 inline void FilterIntoCSClosure::do_oop_nv(T* p) {
  45   T heap_oop = oopDesc::load_heap_oop(p);
  46   if (!oopDesc::is_null(heap_oop) &&
  47       _g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) {
  48     _oc->do_oop(p);
  49   }
  50 }
  51 
  52 template <class T>
  53 inline void FilterOutOfRegionClosure::do_oop_nv(T* p) {
  54   T heap_oop = oopDesc::load_heap_oop(p);
  55   if (!oopDesc::is_null(heap_oop)) {
  56     HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop);
  57     if (obj_hw < _r_bottom || obj_hw >= _r_end) {
  58       _oc->do_oop(p);
  59     }
  60   }
  61 }
  62 
  63 // This closure is applied to the fields of the objects that have just been copied.
  64 template <class T>
  65 inline void G1ParScanClosure::do_oop_nv(T* p) {
  66   T heap_oop = oopDesc::load_heap_oop(p);
  67 
  68   if (!oopDesc::is_null(heap_oop)) {
  69     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
  70     if (_g1->in_cset_fast_test(obj)) {
  71       // We're not going to even bother checking whether the object is
  72       // already forwarded or not, as this usually causes an immediate
  73       // stall. We'll try to prefetch the object (for write, given that
  74       // we might need to install the forwarding reference) and we'll
  75       // get back to it when pop it from the queue
  76       Prefetch::write(obj->mark_addr(), 0);
  77       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
  78 
  79       // slightly paranoid test; I'm trying to catch potential
  80       // problems before we go into push_on_queue to know where the
  81       // problem is coming from
  82       assert((obj == oopDesc::load_decode_heap_oop(p)) ||
  83              (obj->is_forwarded() &&
  84                  obj->forwardee() == oopDesc::load_decode_heap_oop(p)),
  85              "p should still be pointing to obj or to its forwardee");
  86 
  87       _par_scan_state->push_on_queue(p);
  88     } else {
  89       _par_scan_state->update_rs(_from, p, _worker_id);
  90     }
  91   }
  92 }
  93 
  94 template <class T>
  95 inline void G1ParPushHeapRSClosure::do_oop_nv(T* p) {
  96   T heap_oop = oopDesc::load_heap_oop(p);
  97 
  98   if (!oopDesc::is_null(heap_oop)) {
  99     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
 100     if (_g1->in_cset_fast_test(obj)) {
 101       Prefetch::write(obj->mark_addr(), 0);
 102       Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
 103 
 104       // Place on the references queue
 105       _par_scan_state->push_on_queue(p);


 106     }
 107   }
 108 }
 109 
 110 template <class T>
 111 inline void G1CMOopClosure::do_oop_nv(T* p) {
 112   oop obj = oopDesc::load_decode_heap_oop(p);
 113   if (_cm->verbose_high()) {
 114     gclog_or_tty->print_cr("[%u] we're looking at location "
 115                            "*"PTR_FORMAT" = "PTR_FORMAT,
 116                            _task->worker_id(), p2i(p), p2i((void*) obj));
 117   }
 118   _task->deal_with_reference(obj);
 119 }
 120 
 121 template <class T>
 122 inline void G1RootRegionScanClosure::do_oop_nv(T* p) {
 123   T heap_oop = oopDesc::load_heap_oop(p);
 124   if (!oopDesc::is_null(heap_oop)) {
 125     oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
 126     HeapRegion* hr = _g1h->heap_region_containing((HeapWord*) obj);
 127     _cm->grayRoot(obj, obj->size(), _worker_id, hr);
 128   }
 129 }
 130 
 131 template <class T>
 132 inline void G1Mux2Closure::do_oop_nv(T* p) {
 133   // Apply first closure; then apply the second.
 134   _c1->do_oop(p);
 135   _c2->do_oop(p);
 136 }
 137 
 138 template <class T>
 139 inline void G1TriggerClosure::do_oop_nv(T* p) {
 140   // Record that this closure was actually applied (triggered).
 141   _triggered = true;
 142 }
 143 
 144 template <class T>
 145 inline void G1InvokeIfNotTriggeredClosure::do_oop_nv(T* p) {
 146   if (!_trigger_cl->triggered()) {
 147     _oop_cl->do_oop(p);
 148   }
 149 }
 150 
 151 template <class T>
 152 inline void G1UpdateRSOrPushRefOopClosure::do_oop_nv(T* p) {
 153   oop obj = oopDesc::load_decode_heap_oop(p);
 154   if (obj == NULL) {
 155     return;
 156   }
 157 
 158 #ifdef ASSERT
 159   // can't do because of races
 160   // assert(obj == NULL || obj->is_oop(), "expected an oop");
 161 
 162   // Do the safe subset of is_oop
 163 #ifdef CHECK_UNHANDLED_OOPS
 164   oopDesc* o = obj.obj();
 165 #else
 166   oopDesc* o = obj;
 167 #endif // CHECK_UNHANDLED_OOPS
 168   assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
 169   assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
 170 #endif // ASSERT
 171 
 172   assert(_from != NULL, "from region must be non-NULL");
 173   assert(_from->is_in_reserved(p), "p is not in from");
 174 
 175   HeapRegion* to = _g1->heap_region_containing(obj);
 176   if (_from == to) {
 177     // Normally this closure should only be called with cross-region references.
 178     // But since Java threads are manipulating the references concurrently and we
 179     // reload the values things may have changed.
 180     return;
 181   }
 182 
 183   // The _record_refs_into_cset flag is true during the RSet
 184   // updating part of an evacuation pause. It is false at all
 185   // other times:
 186   //  * rebuilding the remembered sets after a full GC
 187   //  * during concurrent refinement.
 188   //  * updating the remembered sets of regions in the collection
 189   //    set in the event of an evacuation failure (when deferred
 190   //    updates are enabled).
 191 
 192   if (_record_refs_into_cset && to->in_collection_set()) {
 193     // We are recording references that point into the collection
 194     // set and this particular reference does exactly that...
 195     // If the referenced object has already been forwarded
 196     // to itself, we are handling an evacuation failure and
 197     // we have already visited/tried to copy this object
 198     // there is no need to retry.
 199     if (!self_forwarded(obj)) {
 200       assert(_push_ref_cl != NULL, "should not be null");
 201       // Push the reference in the refs queue of the G1ParScanThreadState
 202       // instance for this worker thread.
 203       _push_ref_cl->do_oop(p);
 204     }
 205 
 206     // Deferred updates to the CSet are either discarded (in the normal case),
 207     // or processed (if an evacuation failure occurs) at the end
 208     // of the collection.
 209     // See G1RemSet::cleanup_after_oops_into_collection_set_do().
 210   } else {
 211     // We either don't care about pushing references that point into the
 212     // collection set (i.e. we're not during an evacuation pause) _or_
 213     // the reference doesn't point into the collection set. Either way
 214     // we add the reference directly to the RSet of the region containing
 215     // the referenced object.
 216     assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
 217     to->rem_set()->add_reference(p, _worker_i);
 218   }
 219 }
 220 
 221 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1OOPCLOSURES_INLINE_HPP
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