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comparison src/share/vm/runtime/biasedLocking.cpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents d2a62e0f25eb
children 22b8d3d181d9
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6724:36d1d483d5d6 6725:da91efe96a93
1 /* 1 /*
2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2005, 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.
36 BiasedLockingCounters BiasedLocking::_counters; 36 BiasedLockingCounters BiasedLocking::_counters;
37 37
38 static GrowableArray<Handle>* _preserved_oop_stack = NULL; 38 static GrowableArray<Handle>* _preserved_oop_stack = NULL;
39 static GrowableArray<markOop>* _preserved_mark_stack = NULL; 39 static GrowableArray<markOop>* _preserved_mark_stack = NULL;
40 40
41 static void enable_biased_locking(klassOop k) { 41 static void enable_biased_locking(Klass* k) {
42 Klass::cast(k)->set_prototype_header(markOopDesc::biased_locking_prototype()); 42 Klass::cast(k)->set_prototype_header(markOopDesc::biased_locking_prototype());
43 } 43 }
44 44
45 class VM_EnableBiasedLocking: public VM_Operation { 45 class VM_EnableBiasedLocking: public VM_Operation {
46 private: 46 private:
274 // 1. Revoke the biases of all objects in the heap of this type, 274 // 1. Revoke the biases of all objects in the heap of this type,
275 // but allow rebiasing of those objects if unlocked. 275 // but allow rebiasing of those objects if unlocked.
276 // 2. Revoke the biases of all objects in the heap of this type 276 // 2. Revoke the biases of all objects in the heap of this type
277 // and don't allow rebiasing of these objects. Disable 277 // and don't allow rebiasing of these objects. Disable
278 // allocation of objects of that type with the bias bit set. 278 // allocation of objects of that type with the bias bit set.
279 Klass* k = o->blueprint(); 279 Klass* k = o->klass();
280 jlong cur_time = os::javaTimeMillis(); 280 jlong cur_time = os::javaTimeMillis();
281 jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time(); 281 jlong last_bulk_revocation_time = k->last_biased_lock_bulk_revocation_time();
282 int revocation_count = k->biased_lock_revocation_count(); 282 int revocation_count = k->biased_lock_revocation_count();
283 if ((revocation_count >= BiasedLockingBulkRebiasThreshold) && 283 if ((revocation_count >= BiasedLockingBulkRebiasThreshold) &&
284 (revocation_count < BiasedLockingBulkRevokeThreshold) && 284 (revocation_count < BiasedLockingBulkRevokeThreshold) &&
328 (bulk_rebias ? "rebias" : "revoke"), 328 (bulk_rebias ? "rebias" : "revoke"),
329 (intptr_t) o, (intptr_t) o->mark(), Klass::cast(o->klass())->external_name()); 329 (intptr_t) o, (intptr_t) o->mark(), Klass::cast(o->klass())->external_name());
330 } 330 }
331 331
332 jlong cur_time = os::javaTimeMillis(); 332 jlong cur_time = os::javaTimeMillis();
333 o->blueprint()->set_last_biased_lock_bulk_revocation_time(cur_time); 333 o->klass()->set_last_biased_lock_bulk_revocation_time(cur_time);
334 334
335 335
336 klassOop k_o = o->klass(); 336 Klass* k_o = o->klass();
337 Klass* klass = Klass::cast(k_o); 337 Klass* klass = Klass::cast(k_o);
338 338
339 if (bulk_rebias) { 339 if (bulk_rebias) {
340 // Use the epoch in the klass of the object to implicitly revoke 340 // Use the epoch in the klass of the object to implicitly revoke
341 // all biases of objects of this data type and force them to be 341 // all biases of objects of this data type and force them to be