truffle: src/share/vm/memory/sharedHeap.cpp annotate

annotate src/share/vm/memory/sharedHeap.cpp @ 3915:c2bf0120ee5d

7085906: Replace the permgen allocated sentinelRef with a self-looped end Summary: Remove the sentinelRef and let the last Reference in a discovered chain point back to itself. Reviewed-by: ysr, jmasa

author	stefank
date	Thu, 01 Sep 2011 16:18:17 +0200
parents	2aa9ddbb9e60
children	bca17e38de00

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
2426 1d1603768966 7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass trims parents: 2379 diff changeset	2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 989 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 989 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 989 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	26 #include "classfile/symbolTable.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	27 #include "classfile/systemDictionary.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	28 #include "code/codeCache.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	29 #include "gc_interface/collectedHeap.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	30 #include "memory/sharedHeap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	31 #include "oops/oop.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	32 #include "runtime/fprofiler.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	33 #include "runtime/java.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	34 #include "services/management.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	35 #include "utilities/copy.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	36 #include "utilities/workgroup.hpp"
0 a61af66fc99e Initial load duke parents: diff changeset	37
a61af66fc99e Initial load duke parents: diff changeset	38 SharedHeap* SharedHeap::_sh;
a61af66fc99e Initial load duke parents: diff changeset	39
a61af66fc99e Initial load duke parents: diff changeset	40 // The set of potentially parallel tasks in strong root scanning.
a61af66fc99e Initial load duke parents: diff changeset	41 enum SH_process_strong_roots_tasks {
a61af66fc99e Initial load duke parents: diff changeset	42 SH_PS_Universe_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	43 SH_PS_JNIHandles_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	44 SH_PS_ObjectSynchronizer_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	45 SH_PS_FlatProfiler_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	46 SH_PS_Management_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	47 SH_PS_SystemDictionary_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	48 SH_PS_jvmti_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	49 SH_PS_StringTable_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	50 SH_PS_CodeCache_oops_do,
a61af66fc99e Initial load duke parents: diff changeset	51 // Leave this one last.
a61af66fc99e Initial load duke parents: diff changeset	52 SH_PS_NumElements
a61af66fc99e Initial load duke parents: diff changeset	53 };
a61af66fc99e Initial load duke parents: diff changeset	54
a61af66fc99e Initial load duke parents: diff changeset	55 SharedHeap::SharedHeap(CollectorPolicy* policy_) :
a61af66fc99e Initial load duke parents: diff changeset	56 CollectedHeap(),
a61af66fc99e Initial load duke parents: diff changeset	57 _collector_policy(policy_),
a61af66fc99e Initial load duke parents: diff changeset	58 _perm_gen(NULL), _rem_set(NULL),
a61af66fc99e Initial load duke parents: diff changeset	59 _strong_roots_parity(0),
a61af66fc99e Initial load duke parents: diff changeset	60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)),
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	61 _n_par_threads(0),
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	62 _workers(NULL)
0 a61af66fc99e Initial load duke parents: diff changeset	63 {
a61af66fc99e Initial load duke parents: diff changeset	64 if (_process_strong_tasks == NULL \|\| !_process_strong_tasks->valid()) {
a61af66fc99e Initial load duke parents: diff changeset	65 vm_exit_during_initialization("Failed necessary allocation.");
a61af66fc99e Initial load duke parents: diff changeset	66 }
a61af66fc99e Initial load duke parents: diff changeset	67 _sh = this; // ch is static, should be set only once.
a61af66fc99e Initial load duke parents: diff changeset	68 if ((UseParNewGC \|\|
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	69 (UseConcMarkSweepGC && CMSParallelRemarkEnabled) \|\|
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	70 UseG1GC) &&
0 a61af66fc99e Initial load duke parents: diff changeset	71 ParallelGCThreads > 0) {
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	72 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads,
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	73 /* are_GC_task_threads */true,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	74 /* are_ConcurrentGC_threads */false);
0 a61af66fc99e Initial load duke parents: diff changeset	75 if (_workers == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	76 vm_exit_during_initialization("Failed necessary allocation.");
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	77 } else {
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	78 _workers->initialize_workers();
0 a61af66fc99e Initial load duke parents: diff changeset	79 }
a61af66fc99e Initial load duke parents: diff changeset	80 }
a61af66fc99e Initial load duke parents: diff changeset	81 }
a61af66fc99e Initial load duke parents: diff changeset	82
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	83 bool SharedHeap::heap_lock_held_for_gc() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	84 Thread* t = Thread::current();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	85 return Heap_lock->owned_by_self()
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	86 \|\| ( (t->is_GC_task_thread() \|\| t->is_VM_thread())
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	87 && _thread_holds_heap_lock_for_gc);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	88 }
0 a61af66fc99e Initial load duke parents: diff changeset	89
a61af66fc99e Initial load duke parents: diff changeset	90 void SharedHeap::set_par_threads(int t) {
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	91 assert(t == 0 \|\| !UseSerialGC, "Cannot have parallel threads");
0 a61af66fc99e Initial load duke parents: diff changeset	92 _n_par_threads = t;
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1552 diff changeset	93 _process_strong_tasks->set_n_threads(t);
0 a61af66fc99e Initial load duke parents: diff changeset	94 }
a61af66fc99e Initial load duke parents: diff changeset	95
a61af66fc99e Initial load duke parents: diff changeset	96 class AssertIsPermClosure: public OopClosure {
a61af66fc99e Initial load duke parents: diff changeset	97 public:
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	98 virtual void do_oop(oop* p) {
0 a61af66fc99e Initial load duke parents: diff changeset	99 assert((p) == NULL \|\| (p)->is_perm(), "Referent should be perm.");
a61af66fc99e Initial load duke parents: diff changeset	100 }
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	101 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
0 a61af66fc99e Initial load duke parents: diff changeset	102 };
a61af66fc99e Initial load duke parents: diff changeset	103 static AssertIsPermClosure assert_is_perm_closure;
a61af66fc99e Initial load duke parents: diff changeset	104
3377 2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	105 #ifdef ASSERT
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	106 class AssertNonScavengableClosure: public OopClosure {
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	107 public:
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	108 virtual void do_oop(oop* p) {
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	109 assert(!Universe::heap()->is_in_partial_collection(*p),
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	110 "Referent should not be scavengable."); }
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	111 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	112 };
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	113 static AssertNonScavengableClosure assert_is_non_scavengable_closure;
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	114 #endif
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	115
0 a61af66fc99e Initial load duke parents: diff changeset	116 void SharedHeap::change_strong_roots_parity() {
a61af66fc99e Initial load duke parents: diff changeset	117 // Also set the new collection parity.
a61af66fc99e Initial load duke parents: diff changeset	118 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2,
a61af66fc99e Initial load duke parents: diff changeset	119 "Not in range.");
a61af66fc99e Initial load duke parents: diff changeset	120 _strong_roots_parity++;
a61af66fc99e Initial load duke parents: diff changeset	121 if (_strong_roots_parity == 3) _strong_roots_parity = 1;
a61af66fc99e Initial load duke parents: diff changeset	122 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2,
a61af66fc99e Initial load duke parents: diff changeset	123 "Not in range.");
a61af66fc99e Initial load duke parents: diff changeset	124 }
a61af66fc99e Initial load duke parents: diff changeset	125
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	126 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate)
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	127 : MarkScope(activate)
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	128 {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	129 if (_active) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	130 outer->change_strong_roots_parity();
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	131 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	132 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	133
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	134 SharedHeap::StrongRootsScope::~StrongRootsScope() {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	135 // nothing particular
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	136 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	137
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	138 void SharedHeap::process_strong_roots(bool activate_scope,
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	139 bool collecting_perm_gen,
0 a61af66fc99e Initial load duke parents: diff changeset	140 ScanningOption so,
a61af66fc99e Initial load duke parents: diff changeset	141 OopClosure* roots,
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	142 CodeBlobClosure* code_roots,
0 a61af66fc99e Initial load duke parents: diff changeset	143 OopsInGenClosure* perm_blk) {
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	144 StrongRootsScope srs(this, activate_scope);
0 a61af66fc99e Initial load duke parents: diff changeset	145 // General strong roots.
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	146 assert(_strong_roots_parity != 0, "must have called prologue code");
0 a61af66fc99e Initial load duke parents: diff changeset	147 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) {
a61af66fc99e Initial load duke parents: diff changeset	148 Universe::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	149 // Consider perm-gen discovered lists to be strong.
a61af66fc99e Initial load duke parents: diff changeset	150 perm_gen()->ref_processor()->weak_oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	151 }
a61af66fc99e Initial load duke parents: diff changeset	152 // Global (strong) JNI handles
a61af66fc99e Initial load duke parents: diff changeset	153 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do))
a61af66fc99e Initial load duke parents: diff changeset	154 JNIHandles::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	155 // All threads execute this; the individual threads are task groups.
a61af66fc99e Initial load duke parents: diff changeset	156 if (ParallelGCThreads > 0) {
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	157 Threads::possibly_parallel_oops_do(roots, code_roots);
0 a61af66fc99e Initial load duke parents: diff changeset	158 } else {
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	159 Threads::oops_do(roots, code_roots);
0 a61af66fc99e Initial load duke parents: diff changeset	160 }
a61af66fc99e Initial load duke parents: diff changeset	161 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do))
a61af66fc99e Initial load duke parents: diff changeset	162 ObjectSynchronizer::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	163 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do))
a61af66fc99e Initial load duke parents: diff changeset	164 FlatProfiler::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	165 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do))
a61af66fc99e Initial load duke parents: diff changeset	166 Management::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	167 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do))
a61af66fc99e Initial load duke parents: diff changeset	168 JvmtiExport::oops_do(roots);
a61af66fc99e Initial load duke parents: diff changeset	169
a61af66fc99e Initial load duke parents: diff changeset	170 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) {
a61af66fc99e Initial load duke parents: diff changeset	171 if (so & SO_AllClasses) {
a61af66fc99e Initial load duke parents: diff changeset	172 SystemDictionary::oops_do(roots);
3293 1f4413413144 7039089: G1: changeset for 7037276 broke heap verification, and related cleanups ysr parents: 2426 diff changeset	173 } else if (so & SO_SystemClasses) {
1f4413413144 7039089: G1: changeset for 7037276 broke heap verification, and related cleanups ysr parents: 2426 diff changeset	174 SystemDictionary::always_strong_oops_do(roots);
1f4413413144 7039089: G1: changeset for 7037276 broke heap verification, and related cleanups ysr parents: 2426 diff changeset	175 }
0 a61af66fc99e Initial load duke parents: diff changeset	176 }
a61af66fc99e Initial load duke parents: diff changeset	177
a61af66fc99e Initial load duke parents: diff changeset	178 if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) {
2379 b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	179 if (so & SO_Strings \|\| (!collecting_perm_gen && !JavaObjectsInPerm)) {
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	180 StringTable::oops_do(roots);
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	181 }
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	182 if (JavaObjectsInPerm) {
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	183 // Verify the string table contents are in the perm gen
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	184 NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure));
b099aaf51bf8 6962931: move interned strings out of the perm gen jcoomes parents: 2177 diff changeset	185 }
0 a61af66fc99e Initial load duke parents: diff changeset	186 }
a61af66fc99e Initial load duke parents: diff changeset	187
a61af66fc99e Initial load duke parents: diff changeset	188 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) {
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	189 if (so & SO_CodeCache) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	190 // (Currently, CMSCollector uses this to do intermediate-strength collections.)
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	191 assert(collecting_perm_gen, "scanning all of code cache");
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	192 assert(code_roots != NULL, "must supply closure for code cache");
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	193 if (code_roots != NULL) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	194 CodeCache::blobs_do(code_roots);
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	195 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	196 } else if (so & (SO_SystemClasses\|SO_AllClasses)) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	197 if (!collecting_perm_gen) {
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	198 // If we are collecting from class statics, but we are not going to
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	199 // visit all of the CodeCache, collect from the non-perm roots if any.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	200 // This makes the code cache function temporarily as a source of strong
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	201 // roots for oops, until the next major collection.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	202 //
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	203 // If collecting_perm_gen is true, we require that this phase will call
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	204 // CodeCache::do_unloading. This will kill off nmethods with expired
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	205 // weak references, such as stale invokedynamic targets.
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	206 CodeCache::scavenge_root_nmethods_do(code_roots);
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	207 }
148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	208 }
3377 2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	209 // Verify that the code cache contents are not subject to
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	210 // movement by a scavenging collection.
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	211 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /do_marking=/ false));
2aa9ddbb9e60 7041789: 30% perf regression with c2/arm following 7017732 jmasa parents: 3293 diff changeset	212 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable));
0 a61af66fc99e Initial load duke parents: diff changeset	213 }
a61af66fc99e Initial load duke parents: diff changeset	214
a61af66fc99e Initial load duke parents: diff changeset	215 if (!collecting_perm_gen) {
a61af66fc99e Initial load duke parents: diff changeset	216 // All threads perform this; coordination is handled internally.
a61af66fc99e Initial load duke parents: diff changeset	217
a61af66fc99e Initial load duke parents: diff changeset	218 rem_set()->younger_refs_iterate(perm_gen(), perm_blk);
a61af66fc99e Initial load duke parents: diff changeset	219 }
a61af66fc99e Initial load duke parents: diff changeset	220 _process_strong_tasks->all_tasks_completed();
a61af66fc99e Initial load duke parents: diff changeset	221 }
a61af66fc99e Initial load duke parents: diff changeset	222
a61af66fc99e Initial load duke parents: diff changeset	223 class AlwaysTrueClosure: public BoolObjectClosure {
a61af66fc99e Initial load duke parents: diff changeset	224 public:
a61af66fc99e Initial load duke parents: diff changeset	225 void do_object(oop p) { ShouldNotReachHere(); }
a61af66fc99e Initial load duke parents: diff changeset	226 bool do_object_b(oop p) { return true; }
a61af66fc99e Initial load duke parents: diff changeset	227 };
a61af66fc99e Initial load duke parents: diff changeset	228 static AlwaysTrueClosure always_true;
a61af66fc99e Initial load duke parents: diff changeset	229
a61af66fc99e Initial load duke parents: diff changeset	230 class SkipAdjustingSharedStrings: public OopClosure {
a61af66fc99e Initial load duke parents: diff changeset	231 OopClosure* _clo;
a61af66fc99e Initial load duke parents: diff changeset	232 public:
a61af66fc99e Initial load duke parents: diff changeset	233 SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {}
a61af66fc99e Initial load duke parents: diff changeset	234
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	235 virtual void do_oop(oop* p) {
0 a61af66fc99e Initial load duke parents: diff changeset	236 oop o = (*p);
a61af66fc99e Initial load duke parents: diff changeset	237 if (!o->is_shared_readwrite()) {
a61af66fc99e Initial load duke parents: diff changeset	238 _clo->do_oop(p);
a61af66fc99e Initial load duke parents: diff changeset	239 }
a61af66fc99e Initial load duke parents: diff changeset	240 }
113 ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes coleenp parents: 0 diff changeset	241 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); }
0 a61af66fc99e Initial load duke parents: diff changeset	242 };
a61af66fc99e Initial load duke parents: diff changeset	243
a61af66fc99e Initial load duke parents: diff changeset	244 // Unmarked shared Strings in the StringTable (which got there due to
a61af66fc99e Initial load duke parents: diff changeset	245 // being in the constant pools of as-yet unloaded shared classes) were
a61af66fc99e Initial load duke parents: diff changeset	246 // not marked and therefore did not have their mark words preserved.
a61af66fc99e Initial load duke parents: diff changeset	247 // These entries are also deliberately not purged from the string
a61af66fc99e Initial load duke parents: diff changeset	248 // table during unloading of unmarked strings. If an identity hash
a61af66fc99e Initial load duke parents: diff changeset	249 // code was computed for any of these objects, it will not have been
a61af66fc99e Initial load duke parents: diff changeset	250 // cleared to zero during the forwarding process or by the
a61af66fc99e Initial load duke parents: diff changeset	251 // RecursiveAdjustSharedObjectClosure, and will be confused by the
a61af66fc99e Initial load duke parents: diff changeset	252 // adjusting process as a forwarding pointer. We need to skip
a61af66fc99e Initial load duke parents: diff changeset	253 // forwarding StringTable entries which contain unmarked shared
a61af66fc99e Initial load duke parents: diff changeset	254 // Strings. Actually, since shared strings won't be moving, we can
a61af66fc99e Initial load duke parents: diff changeset	255 // just skip adjusting any shared entries in the string table.
a61af66fc99e Initial load duke parents: diff changeset	256
a61af66fc99e Initial load duke parents: diff changeset	257 void SharedHeap::process_weak_roots(OopClosure* root_closure,
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	258 CodeBlobClosure* code_roots,
0 a61af66fc99e Initial load duke parents: diff changeset	259 OopClosure* non_root_closure) {
a61af66fc99e Initial load duke parents: diff changeset	260 // Global (weak) JNI handles
a61af66fc99e Initial load duke parents: diff changeset	261 JNIHandles::weak_oops_do(&always_true, root_closure);
a61af66fc99e Initial load duke parents: diff changeset	262
989 148e5441d916 6863023: need non-perm oops in code cache for JSR 292 jrose parents: 579 diff changeset	263 CodeCache::blobs_do(code_roots);
0 a61af66fc99e Initial load duke parents: diff changeset	264 if (UseSharedSpaces && !DumpSharedSpaces) {
a61af66fc99e Initial load duke parents: diff changeset	265 SkipAdjustingSharedStrings skip_closure(root_closure);
a61af66fc99e Initial load duke parents: diff changeset	266 StringTable::oops_do(&skip_closure);
a61af66fc99e Initial load duke parents: diff changeset	267 } else {
a61af66fc99e Initial load duke parents: diff changeset	268 StringTable::oops_do(root_closure);
a61af66fc99e Initial load duke parents: diff changeset	269 }
a61af66fc99e Initial load duke parents: diff changeset	270 }
a61af66fc99e Initial load duke parents: diff changeset	271
a61af66fc99e Initial load duke parents: diff changeset	272 void SharedHeap::set_barrier_set(BarrierSet* bs) {
a61af66fc99e Initial load duke parents: diff changeset	273 _barrier_set = bs;
a61af66fc99e Initial load duke parents: diff changeset	274 // Cached barrier set for fast access in oops
a61af66fc99e Initial load duke parents: diff changeset	275 oopDesc::set_bs(bs);
a61af66fc99e Initial load duke parents: diff changeset	276 }
a61af66fc99e Initial load duke parents: diff changeset	277
a61af66fc99e Initial load duke parents: diff changeset	278 void SharedHeap::post_initialize() {
a61af66fc99e Initial load duke parents: diff changeset	279 ref_processing_init();
a61af66fc99e Initial load duke parents: diff changeset	280 }
a61af66fc99e Initial load duke parents: diff changeset	281
a61af66fc99e Initial load duke parents: diff changeset	282 void SharedHeap::ref_processing_init() {
a61af66fc99e Initial load duke parents: diff changeset	283 perm_gen()->ref_processor_init();
a61af66fc99e Initial load duke parents: diff changeset	284 }
a61af66fc99e Initial load duke parents: diff changeset	285
a61af66fc99e Initial load duke parents: diff changeset	286 // Some utilities.
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	287 void SharedHeap::print_size_transition(outputStream* out,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	288 size_t bytes_before,
0 a61af66fc99e Initial load duke parents: diff changeset	289 size_t bytes_after,
a61af66fc99e Initial load duke parents: diff changeset	290 size_t capacity) {
342 37f87013dfd8 6711316: Open source the Garbage-First garbage collector ysr parents: 113 diff changeset	291 out->print(" %d%s->%d%s(%d%s)",
0 a61af66fc99e Initial load duke parents: diff changeset	292 byte_size_in_proper_unit(bytes_before),
a61af66fc99e Initial load duke parents: diff changeset	293 proper_unit_for_byte_size(bytes_before),
a61af66fc99e Initial load duke parents: diff changeset	294 byte_size_in_proper_unit(bytes_after),
a61af66fc99e Initial load duke parents: diff changeset	295 proper_unit_for_byte_size(bytes_after),
a61af66fc99e Initial load duke parents: diff changeset	296 byte_size_in_proper_unit(capacity),
a61af66fc99e Initial load duke parents: diff changeset	297 proper_unit_for_byte_size(capacity));
a61af66fc99e Initial load duke parents: diff changeset	298 }

Mercurial > hg > truffle

annotate src/share/vm/memory/sharedHeap.cpp @ 3915:c2bf0120ee5d