Mercurial > hg > truffle
comparison src/share/vm/runtime/biasedLocking.cpp @ 6725:da91efe96a93
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 |
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date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | d2a62e0f25eb |
children | 22b8d3d181d9 |
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6724:36d1d483d5d6 | 6725:da91efe96a93 |
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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 |