Mercurial > hg > truffle

comparison src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp @ 4839:b4ebad3520bb

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7133038: G1: Some small profile based optimizations Summary: Some minor profile based optimizations. Reduce the number of branches and branch mispredicts by removing some virtual calls, through closure specalization, and refactoring some conditional statements. Reviewed-by: brutisso, tonyp
author johnc
date Thu, 26 Jan 2012 14:14:55 -0800
parents 441e946dc1af
children b0c374311c4e
comparison
equal deleted inserted replaced
4838:a5244e07b761 4839:b4ebad3520bb
1 /* 1 /*
2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
83 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) { 83 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
84 _g1_rem_set->par_write_ref(_from, p, 0); 84 _g1_rem_set->par_write_ref(_from, p, 0);
85 } 85 }
86 } 86 }
87 87
88 template <class T>
89 inline void UpdateRSOrPushRefOopClosure::do_oop_work(T* p) {
90 oop obj = oopDesc::load_decode_heap_oop(p);
91 #ifdef ASSERT
92 // can't do because of races
93 // assert(obj == NULL || obj->is_oop(), "expected an oop");
94
95 // Do the safe subset of is_oop
96 if (obj != NULL) {
97 #ifdef CHECK_UNHANDLED_OOPS
98 oopDesc* o = obj.obj();
99 #else
100 oopDesc* o = obj;
101 #endif // CHECK_UNHANDLED_OOPS
102 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
103 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
104 }
105 #endif // ASSERT
106
107 assert(_from != NULL, "from region must be non-NULL");
108
109 HeapRegion* to = _g1->heap_region_containing(obj);
110 if (to != NULL && _from != to) {
111 // The _record_refs_into_cset flag is true during the RSet
112 // updating part of an evacuation pause. It is false at all
113 // other times:
114 // * rebuilding the rembered sets after a full GC
115 // * during concurrent refinement.
116 // * updating the remembered sets of regions in the collection
117 // set in the event of an evacuation failure (when deferred
118 // updates are enabled).
119
120 if (_record_refs_into_cset && to->in_collection_set()) {
121 // We are recording references that point into the collection
122 // set and this particular reference does exactly that...
123 // If the referenced object has already been forwarded
124 // to itself, we are handling an evacuation failure and
125 // we have already visited/tried to copy this object
126 // there is no need to retry.
127 if (!self_forwarded(obj)) {
128 assert(_push_ref_cl != NULL, "should not be null");
129 // Push the reference in the refs queue of the G1ParScanThreadState
130 // instance for this worker thread.
131 _push_ref_cl->do_oop(p);
132 }
133
134 // Deferred updates to the CSet are either discarded (in the normal case),
135 // or processed (if an evacuation failure occurs) at the end
136 // of the collection.
137 // See G1RemSet::cleanup_after_oops_into_collection_set_do().
138 } else {
139 // We either don't care about pushing references that point into the
140 // collection set (i.e. we're not during an evacuation pause) _or_
141 // the reference doesn't point into the collection set. Either way
142 // we add the reference directly to the RSet of the region containing
143 // the referenced object.
144 _g1_rem_set->par_write_ref(_from, p, _worker_i);
145 }
146 }
147 }
148
149
150 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP 88 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP