view hotspot/src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp @ 26701:f8ff74a6c058

8052172: Evacuation failure handling in G1 does not evacuate all objects if -XX:-G1DeferredRSUpdate is set Summary: Remove -XX:-G1DeferredRSUpdate functionality as it is racy. During evacuation failure handling, threads where evacuation failure handling occurred may try to add remembered sets to regions which remembered sets are currently being scanned. The iterator to handle the remembered set scan does not support addition of entries during scan and so may skip valid references. Reviewed-by: iveresov, brutisso, mgerdin
author tschatzl
date Tue, 16 Sep 2014 10:28:15 +0200
parents b69656f26643
children 515ff48cf5f0
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/*
 * Copyright (c) 2001, 2012, 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.
 *
 */

#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP

#include "gc_implementation/g1/g1RemSet.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/heapRegionRemSet.hpp"
#include "oops/oop.inline.hpp"

inline uint G1RemSet::n_workers() {
  if (_g1->workers() != NULL) {
    return _g1->workers()->total_workers();
  } else {
    return 1;
  }
}

template <class T>
inline void G1RemSet::write_ref(HeapRegion* from, T* p) {
  par_write_ref(from, p, 0);
}

template <class T>
inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {
  oop obj = oopDesc::load_decode_heap_oop(p);
  if (obj == NULL) {
    return;
  }

#ifdef ASSERT
  // can't do because of races
  // assert(obj == NULL || obj->is_oop(), "expected an oop");

  // Do the safe subset of is_oop
#ifdef CHECK_UNHANDLED_OOPS
  oopDesc* o = obj.obj();
#else
  oopDesc* o = obj;
#endif // CHECK_UNHANDLED_OOPS
  assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
  assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
#endif // ASSERT

  assert(from == NULL || from->is_in_reserved(p), "p is not in from");

  HeapRegion* to = _g1->heap_region_containing(obj);
  if (from != to) {
    assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
    to->rem_set()->add_reference(p, tid);
  }
}

template <class T>
inline void UpdateRSOopClosure::do_oop_work(T* p) {
  assert(_from != NULL, "from region must be non-NULL");
  _rs->par_write_ref(_from, p, _worker_i);
}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP