author | johnc |
Tue, 16 Nov 2010 14:07:33 -0800 | |
changeset 7385 | eaca4b61b374 |
parent 6958 | cfa71cf3564d |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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inline size_t G1RemSet::n_workers() { |
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if (_g1->workers() != NULL) { |
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return _g1->workers()->total_workers(); |
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} else { |
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return 1; |
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} |
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} |
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||
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template <class T> |
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inline void G1RemSet::write_ref(HeapRegion* from, T* p) { |
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par_write_ref(from, p, 0); |
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} |
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||
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template <class T> |
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inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) { |
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oop obj = oopDesc::load_decode_heap_oop(p); |
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#ifdef ASSERT |
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// can't do because of races |
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// assert(obj == NULL || obj->is_oop(), "expected an oop"); |
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// Do the safe subset of is_oop |
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if (obj != NULL) { |
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#ifdef CHECK_UNHANDLED_OOPS |
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oopDesc* o = obj.obj(); |
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#else |
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oopDesc* o = obj; |
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#endif // CHECK_UNHANDLED_OOPS |
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assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); |
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assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); |
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} |
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#endif // ASSERT |
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assert(from == NULL || from->is_in_reserved(p), "p is not in from"); |
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HeapRegion* to = _g1->heap_region_containing(obj); |
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if (to != NULL && from != to) { |
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#if G1_REM_SET_LOGGING |
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gclog_or_tty->print_cr("Adding " PTR_FORMAT " (" PTR_FORMAT ") to RS" |
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" for region [" PTR_FORMAT ", " PTR_FORMAT ")", |
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p, obj, |
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to->bottom(), to->end()); |
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#endif |
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assert(to->rem_set() != NULL, "Need per-region 'into' remsets."); |
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to->rem_set()->add_reference(p, tid); |
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} |
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} |
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template <class T> |
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inline void UpdateRSOopClosure::do_oop_work(T* p) { |
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assert(_from != NULL, "from region must be non-NULL"); |
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_rs->par_write_ref(_from, p, _worker_i); |
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} |
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template <class T> |
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inline void UpdateRSetImmediate::do_oop_work(T* p) { |
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assert(_from->is_in_reserved(p), "paranoia"); |
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T heap_oop = oopDesc::load_heap_oop(p); |
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if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { |
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_g1_rem_set->par_write_ref(_from, p, 0); |
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} |
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} |
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||
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template <class T> |
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inline void UpdateRSOrPushRefOopClosure::do_oop_work(T* p) { |
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oop obj = oopDesc::load_decode_heap_oop(p); |
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#ifdef ASSERT |
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// can't do because of races |
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// assert(obj == NULL || obj->is_oop(), "expected an oop"); |
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// Do the safe subset of is_oop |
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if (obj != NULL) { |
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#ifdef CHECK_UNHANDLED_OOPS |
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oopDesc* o = obj.obj(); |
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#else |
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oopDesc* o = obj; |
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#endif // CHECK_UNHANDLED_OOPS |
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assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned"); |
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assert(Universe::heap()->is_in_reserved(obj), "must be in heap"); |
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} |
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#endif // ASSERT |
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assert(_from != NULL, "from region must be non-NULL"); |
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HeapRegion* to = _g1->heap_region_containing(obj); |
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if (to != NULL && _from != to) { |
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// The _record_refs_into_cset flag is true during the RSet |
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// updating part of an evacuation pause. It is false at all |
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// other times: |
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// * rebuilding the rembered sets after a full GC |
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// * during concurrent refinement. |
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// * updating the remembered sets of regions in the collection |
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// set in the event of an evacuation failure (when deferred |
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// updates are enabled). |
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if (_record_refs_into_cset && to->in_collection_set()) { |
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// We are recording references that point into the collection |
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// set and this particular reference does exactly that... |
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// If the referenced object has already been forwarded |
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// to itself, we are handling an evacuation failure and |
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// we have already visited/tried to copy this object |
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// there is no need to retry. |
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if (!self_forwarded(obj)) { |
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assert(_push_ref_cl != NULL, "should not be null"); |
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// Push the reference in the refs queue of the G1ParScanThreadState |
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// instance for this worker thread. |
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_push_ref_cl->do_oop(p); |
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} |
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|
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// Deferred updates to the CSet are either discarded (in the normal case), |
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// or processed (if an evacuation failure occurs) at the end |
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// of the collection. |
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// See G1RemSet::cleanup_after_oops_into_collection_set_do(). |
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} else { |
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// We either don't care about pushing references that point into the |
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// collection set (i.e. we're not during an evacuation pause) _or_ |
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// the reference doesn't point into the collection set. Either way |
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// we add the reference directly to the RSet of the region containing |
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// the referenced object. |
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_g1_rem_set->par_write_ref(_from, p, _worker_i); |
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} |
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} |
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} |
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