jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp

Thu, 22 Sep 2011 10:57:37 -0700

author: johnc
date: Thu, 22 Sep 2011 10:57:37 -0700
changeset 3175: 4dfb2df418f2
parent 3058: 3be7439273c5
child 3713: 720b6a76dd9d
permissions: -rw-r--r--

6484982: G1: process references during evacuation pauses
Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate.
Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp

 /*
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  * 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
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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
 #include "gc_implementation/g1/heapRegionSet.hpp"
 //////////////////// HeapRegionSetBase ////////////////////
 inline void HeapRegionSetBase::update_for_addition(HeapRegion* hr) {
   // Assumes the caller has already verified the region.
   _length           += 1;
   if (!hr->isHumongous()) {
     _region_num     += 1;
   } else {
     _region_num     += calculate_region_num(hr);
   }
   _total_used_bytes += hr->used();
 }
 inline void HeapRegionSetBase::add_internal(HeapRegion* hr) {
   hrs_assert_region_ok(this, hr, NULL);
   assert(hr->next() == NULL, hrs_ext_msg(this, "should not already be linked"));
   update_for_addition(hr);
   hr->set_containing_set(this);
 }
 inline void HeapRegionSetBase::update_for_removal(HeapRegion* hr) {
   // Assumes the caller has already verified the region.
   assert(_length > 0, hrs_ext_msg(this, "pre-condition"));
   _length -= 1;
   size_t region_num_diff;
   if (!hr->isHumongous()) {
     region_num_diff = 1;
   } else {
     region_num_diff = calculate_region_num(hr);
   }
   assert(region_num_diff <= _region_num,
          hrs_err_msg("[%s] region's region num: "SIZE_FORMAT" "
                      "should be <= region num: "SIZE_FORMAT,
                      name(), region_num_diff, _region_num));
   _region_num -= region_num_diff;
   size_t used_bytes = hr->used();
   assert(used_bytes <= _total_used_bytes,
          hrs_err_msg("[%s] region's used bytes: "SIZE_FORMAT" "
                      "should be <= used bytes: "SIZE_FORMAT,
                      name(), used_bytes, _total_used_bytes));
   _total_used_bytes -= used_bytes;
 }
 inline void HeapRegionSetBase::remove_internal(HeapRegion* hr) {
   hrs_assert_region_ok(this, hr, this);
   assert(hr->next() == NULL, hrs_ext_msg(this, "should already be unlinked"));
   hr->set_containing_set(NULL);
   update_for_removal(hr);
 }
 //////////////////// HeapRegionSet ////////////////////
 inline void HeapRegionSet::add(HeapRegion* hr) {
   hrs_assert_mt_safety_ok(this);
   // add_internal() will verify the region.
   add_internal(hr);
 }
 inline void HeapRegionSet::remove(HeapRegion* hr) {
   hrs_assert_mt_safety_ok(this);
   // remove_internal() will verify the region.
   remove_internal(hr);
 }
 inline void HeapRegionSet::remove_with_proxy(HeapRegion* hr,
                                              HeapRegionSet* proxy_set) {
   // No need to fo the MT safety check here given that this method
   // does not update the contents of the set but instead accumulates
   // the changes in proxy_set which is assumed to be thread-local.
   hrs_assert_sets_match(this, proxy_set);
   hrs_assert_region_ok(this, hr, this);
   hr->set_containing_set(NULL);
   proxy_set->update_for_addition(hr);
 }
 //////////////////// HeapRegionLinkedList ////////////////////
 inline void HeapRegionLinkedList::add_as_head(HeapRegion* hr) {
   hrs_assert_mt_safety_ok(this);
   assert((length() == 0 && _head == NULL && _tail == NULL) ||
          (length() >  0 && _head != NULL && _tail != NULL),
          hrs_ext_msg(this, "invariant"));
   // add_internal() will verify the region.
   add_internal(hr);
   // Now link the region.
   if (_head != NULL) {
     hr->set_next(_head);
   } else {
     _tail = hr;
   }
   _head = hr;
 }
 inline void HeapRegionLinkedList::add_as_tail(HeapRegion* hr) {
   hrs_assert_mt_safety_ok(this);
   assert((length() == 0 && _head == NULL && _tail == NULL) ||
          (length() >  0 && _head != NULL && _tail != NULL),
          hrs_ext_msg(this, "invariant"));
   // add_internal() will verify the region.
   add_internal(hr);
   // Now link the region.
   if (_tail != NULL) {
     _tail->set_next(hr);
   } else {
     _head = hr;
   }
   _tail = hr;
 }
 inline HeapRegion* HeapRegionLinkedList::remove_head() {
   hrs_assert_mt_safety_ok(this);
   assert(!is_empty(), hrs_ext_msg(this, "the list should not be empty"));
   assert(length() > 0 && _head != NULL && _tail != NULL,
          hrs_ext_msg(this, "invariant"));
   // We need to unlink it first.
   HeapRegion* hr = _head;
   _head = hr->next();
   if (_head == NULL) {
     _tail = NULL;
   }
   hr->set_next(NULL);
   // remove_internal() will verify the region.
   remove_internal(hr);
   return hr;
 }
 inline HeapRegion* HeapRegionLinkedList::remove_head_or_null() {
   hrs_assert_mt_safety_ok(this);
   if (!is_empty()) {
     return remove_head();
   } else {
     return NULL;
   }
 }
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP

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src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp@4dfb2df418f2 (annotated)

src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp