Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/sweeper.cpp @ 6462:b3f5dc099f9d
removed XIR
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Sun, 30 Sep 2012 13:21:20 +0200 |
parents | 957c266d8bc5 |
children | e522a00b91aa |
rev | line source |
---|---|
0 | 1 /* |
2426
1d1603768966
7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass
trims
parents:
2353
diff
changeset
|
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
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 | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1538
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1538
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:
1538
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "code/codeCache.hpp" | |
27 #include "code/nmethod.hpp" | |
28 #include "compiler/compileBroker.hpp" | |
29 #include "memory/resourceArea.hpp" | |
30 #include "oops/methodOop.hpp" | |
31 #include "runtime/atomic.hpp" | |
32 #include "runtime/compilationPolicy.hpp" | |
33 #include "runtime/mutexLocker.hpp" | |
34 #include "runtime/os.hpp" | |
35 #include "runtime/sweeper.hpp" | |
36 #include "runtime/vm_operations.hpp" | |
37 #include "utilities/events.hpp" | |
38 #include "utilities/xmlstream.hpp" | |
0 | 39 |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
40 #ifdef ASSERT |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
41 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
42 #define SWEEP(nm) record_sweep(nm, __LINE__) |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
43 // Sweeper logging code |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
44 class SweeperRecord { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
45 public: |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
46 int traversal; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
47 int invocation; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
48 int compile_id; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
49 long traversal_mark; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
50 int state; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
51 const char* kind; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
52 address vep; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
53 address uep; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
54 int line; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
55 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
56 void print() { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
57 tty->print_cr("traversal = %d invocation = %d compile_id = %d %s uep = " PTR_FORMAT " vep = " |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
58 PTR_FORMAT " state = %d traversal_mark %d line = %d", |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
59 traversal, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
60 invocation, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
61 compile_id, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
62 kind == NULL ? "" : kind, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
63 uep, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
64 vep, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
65 state, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
66 traversal_mark, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
67 line); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
68 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
69 }; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
70 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
71 static int _sweep_index = 0; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
72 static SweeperRecord* _records = NULL; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
73 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
74 void NMethodSweeper::report_events(int id, address entry) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
75 if (_records != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
76 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
77 if (_records[i].uep == entry || |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
78 _records[i].vep == entry || |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
79 _records[i].compile_id == id) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
80 _records[i].print(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
81 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
82 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
83 for (int i = 0; i < _sweep_index; i++) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
84 if (_records[i].uep == entry || |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
85 _records[i].vep == entry || |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
86 _records[i].compile_id == id) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
87 _records[i].print(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
88 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
89 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
90 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
91 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
92 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
93 void NMethodSweeper::report_events() { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
94 if (_records != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
95 for (int i = _sweep_index; i < SweeperLogEntries; i++) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
96 // skip empty records |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
97 if (_records[i].vep == NULL) continue; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
98 _records[i].print(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
99 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
100 for (int i = 0; i < _sweep_index; i++) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
101 // skip empty records |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
102 if (_records[i].vep == NULL) continue; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
103 _records[i].print(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
104 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
105 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
106 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
107 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
108 void NMethodSweeper::record_sweep(nmethod* nm, int line) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
109 if (_records != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
110 _records[_sweep_index].traversal = _traversals; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
111 _records[_sweep_index].traversal_mark = nm->_stack_traversal_mark; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
112 _records[_sweep_index].invocation = _invocations; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
113 _records[_sweep_index].compile_id = nm->compile_id(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
114 _records[_sweep_index].kind = nm->compile_kind(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
115 _records[_sweep_index].state = nm->_state; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
116 _records[_sweep_index].vep = nm->verified_entry_point(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
117 _records[_sweep_index].uep = nm->entry_point(); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
118 _records[_sweep_index].line = line; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
119 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
120 _sweep_index = (_sweep_index + 1) % SweeperLogEntries; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
121 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
122 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
123 #else |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
124 #define SWEEP(nm) |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
125 #endif |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
126 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
127 |
0 | 128 long NMethodSweeper::_traversals = 0; // No. of stack traversals performed |
1615
ff38d05ea86f
6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
never
parents:
1552
diff
changeset
|
129 nmethod* NMethodSweeper::_current = NULL; // Current nmethod |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
130 int NMethodSweeper::_seen = 0 ; // No. of nmethods we have currently processed in current pass of CodeCache |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
131 |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
132 volatile int NMethodSweeper::_invocations = 0; // No. of invocations left until we are completed with this pass |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
133 volatile int NMethodSweeper::_sweep_started = 0; // Whether a sweep is in progress. |
0 | 134 |
135 jint NMethodSweeper::_locked_seen = 0; | |
136 jint NMethodSweeper::_not_entrant_seen_on_stack = 0; | |
137 bool NMethodSweeper::_rescan = false; | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
138 bool NMethodSweeper::_do_sweep = false; |
1202 | 139 bool NMethodSweeper::_was_full = false; |
140 jint NMethodSweeper::_advise_to_sweep = 0; | |
141 jlong NMethodSweeper::_last_was_full = 0; | |
142 uint NMethodSweeper::_highest_marked = 0; | |
143 long NMethodSweeper::_was_full_traversal = 0; | |
0 | 144 |
989 | 145 class MarkActivationClosure: public CodeBlobClosure { |
146 public: | |
147 virtual void do_code_blob(CodeBlob* cb) { | |
148 // If we see an activation belonging to a non_entrant nmethod, we mark it. | |
149 if (cb->is_nmethod() && ((nmethod*)cb)->is_not_entrant()) { | |
150 ((nmethod*)cb)->mark_as_seen_on_stack(); | |
151 } | |
152 } | |
153 }; | |
154 static MarkActivationClosure mark_activation_closure; | |
155 | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
156 void NMethodSweeper::scan_stacks() { |
0 | 157 assert(SafepointSynchronize::is_at_safepoint(), "must be executed at a safepoint"); |
158 if (!MethodFlushing) return; | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
159 _do_sweep = true; |
0 | 160 |
161 // No need to synchronize access, since this is always executed at a | |
162 // safepoint. If we aren't in the middle of scan and a rescan | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
163 // hasn't been requested then just return. If UseCodeCacheFlushing is on and |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
164 // code cache flushing is in progress, don't skip sweeping to help make progress |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
165 // clearing space in the code cache. |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
166 if ((_current == NULL && !_rescan) && !(UseCodeCacheFlushing && !CompileBroker::should_compile_new_jobs())) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
167 _do_sweep = false; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
168 return; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
169 } |
0 | 170 |
171 // Make sure CompiledIC_lock in unlocked, since we might update some | |
172 // inline caches. If it is, we just bail-out and try later. | |
173 if (CompiledIC_lock->is_locked() || Patching_lock->is_locked()) return; | |
174 | |
175 // Check for restart | |
176 assert(CodeCache::find_blob_unsafe(_current) == _current, "Sweeper nmethod cached state invalid"); | |
177 if (_current == NULL) { | |
178 _seen = 0; | |
179 _invocations = NmethodSweepFraction; | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
180 _current = CodeCache::first_nmethod(); |
0 | 181 _traversals += 1; |
182 if (PrintMethodFlushing) { | |
183 tty->print_cr("### Sweep: stack traversal %d", _traversals); | |
184 } | |
989 | 185 Threads::nmethods_do(&mark_activation_closure); |
0 | 186 |
187 // reset the flags since we started a scan from the beginning. | |
188 _rescan = false; | |
189 _locked_seen = 0; | |
190 _not_entrant_seen_on_stack = 0; | |
191 } | |
192 | |
1202 | 193 if (UseCodeCacheFlushing) { |
194 if (!CodeCache::needs_flushing()) { | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
195 // scan_stacks() runs during a safepoint, no race with setters |
1202 | 196 _advise_to_sweep = 0; |
197 } | |
198 | |
199 if (was_full()) { | |
200 // There was some progress so attempt to restart the compiler | |
201 jlong now = os::javaTimeMillis(); | |
202 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000; | |
203 jlong curr_interval = now - _last_was_full; | |
204 if ((!CodeCache::needs_flushing()) && (curr_interval > max_interval)) { | |
205 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); | |
206 set_was_full(false); | |
207 | |
208 // Update the _last_was_full time so we can tell how fast the | |
209 // code cache is filling up | |
210 _last_was_full = os::javaTimeMillis(); | |
211 | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
212 log_sweep("restart_compiler"); |
1202 | 213 } |
214 } | |
215 } | |
0 | 216 } |
217 | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
218 void NMethodSweeper::possibly_sweep() { |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
219 assert(JavaThread::current()->thread_state() == _thread_in_vm, "must run in vm mode"); |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
220 if ((!MethodFlushing) || (!_do_sweep)) return; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
221 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
222 if (_invocations > 0) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
223 // Only one thread at a time will sweep |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
224 jint old = Atomic::cmpxchg( 1, &_sweep_started, 0 ); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
225 if (old != 0) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
226 return; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
227 } |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
228 #ifdef ASSERT |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
229 if (LogSweeper && _records == NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
230 // Create the ring buffer for the logging code |
6197 | 231 _records = NEW_C_HEAP_ARRAY(SweeperRecord, SweeperLogEntries, mtGC); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
232 memset(_records, 0, sizeof(SweeperRecord) * SweeperLogEntries); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
233 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
234 #endif |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
235 if (_invocations > 0) { |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
236 sweep_code_cache(); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
237 _invocations--; |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
238 } |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
239 _sweep_started = 0; |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
240 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
241 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
242 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
243 void NMethodSweeper::sweep_code_cache() { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
244 #ifdef ASSERT |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
245 jlong sweep_start; |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
246 if (PrintMethodFlushing) { |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
247 sweep_start = os::javaTimeMillis(); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
248 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
249 #endif |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
250 if (PrintMethodFlushing && Verbose) { |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
251 tty->print_cr("### Sweep at %d out of %d. Invocations left: %d", _seen, CodeCache::nof_nmethods(), _invocations); |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
252 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
253 |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
254 // We want to visit all nmethods after NmethodSweepFraction |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
255 // invocations so divide the remaining number of nmethods by the |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
256 // remaining number of invocations. This is only an estimate since |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
257 // the number of nmethods changes during the sweep so the final |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
258 // stage must iterate until it there are no more nmethods. |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
259 int todo = (CodeCache::nof_nmethods() - _seen) / _invocations; |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
260 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
261 assert(!SafepointSynchronize::is_at_safepoint(), "should not be in safepoint when we get here"); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
262 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
263 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
264 { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
265 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
266 |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
267 // The last invocation iterates until there are no more nmethods |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
268 for (int i = 0; (i < todo || _invocations == 1) && _current != NULL; i++) { |
4945
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
269 if (SafepointSynchronize::is_synchronizing()) { // Safepoint request |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
270 if (PrintMethodFlushing && Verbose) { |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
271 tty->print_cr("### Sweep at %d out of %d, invocation: %d, yielding to safepoint", _seen, CodeCache::nof_nmethods(), _invocations); |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
272 } |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
273 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
274 |
4945
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
275 assert(Thread::current()->is_Java_thread(), "should be java thread"); |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
276 JavaThread* thread = (JavaThread*)Thread::current(); |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
277 ThreadBlockInVM tbivm(thread); |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
278 thread->java_suspend_self(); |
cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
iveresov
parents:
3384
diff
changeset
|
279 } |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
280 // Since we will give up the CodeCache_lock, always skip ahead |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
281 // to the next nmethod. Other blobs can be deleted by other |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
282 // threads but nmethods are only reclaimed by the sweeper. |
1615
ff38d05ea86f
6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
never
parents:
1552
diff
changeset
|
283 nmethod* next = CodeCache::next_nmethod(_current); |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
284 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
285 // Now ready to process nmethod and give up CodeCache_lock |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
286 { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
287 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
1615
ff38d05ea86f
6956958: assert(is_clean() || is_call_to_compiled() || is_call_to_interpreted() || is_optimized() || is_megam
never
parents:
1552
diff
changeset
|
288 process_nmethod(_current); |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
289 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
290 _seen++; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
291 _current = next; |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
292 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
293 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
294 |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
295 assert(_invocations > 1 || _current == NULL, "must have scanned the whole cache"); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
296 |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
297 if (_current == NULL && !_rescan && (_locked_seen || _not_entrant_seen_on_stack)) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
298 // we've completed a scan without making progress but there were |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
299 // nmethods we were unable to process either because they were |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
300 // locked or were still on stack. We don't have to aggresively |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
301 // clean them up so just stop scanning. We could scan once more |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
302 // but that complicates the control logic and it's unlikely to |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
303 // matter much. |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
304 if (PrintMethodFlushing) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
305 tty->print_cr("### Couldn't make progress on some nmethods so stopping sweep"); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
306 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
307 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
308 |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
309 #ifdef ASSERT |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
310 if(PrintMethodFlushing) { |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
311 jlong sweep_end = os::javaTimeMillis(); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
312 tty->print_cr("### sweeper: sweep time(%d): " INT64_FORMAT, _invocations, sweep_end - sweep_start); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
313 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
314 #endif |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
315 |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
316 if (_invocations == 1) { |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
317 log_sweep("finished"); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
318 } |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
319 } |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
320 |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
321 class NMethodMarker: public StackObj { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
322 private: |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3384
diff
changeset
|
323 JavaThread* _thread; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
324 public: |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
325 NMethodMarker(nmethod* nm) { |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3384
diff
changeset
|
326 _thread = JavaThread::current(); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
327 _thread->set_scanned_nmethod(nm); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
328 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
329 ~NMethodMarker() { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
330 _thread->set_scanned_nmethod(NULL); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
331 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
332 }; |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
333 |
0 | 334 |
335 void NMethodSweeper::process_nmethod(nmethod *nm) { | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
336 assert(!CodeCache_lock->owned_by_self(), "just checking"); |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
337 |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
338 // Make sure this nmethod doesn't get unloaded during the scan, |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
339 // since the locks acquired below might safepoint. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
340 NMethodMarker nmm(nm); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
341 |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
342 SWEEP(nm); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
343 |
0 | 344 // Skip methods that are currently referenced by the VM |
345 if (nm->is_locked_by_vm()) { | |
346 // But still remember to clean-up inline caches for alive nmethods | |
347 if (nm->is_alive()) { | |
348 // Clean-up all inline caches that points to zombie/non-reentrant methods | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
349 MutexLocker cl(CompiledIC_lock); |
0 | 350 nm->cleanup_inline_caches(); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
351 SWEEP(nm); |
0 | 352 } else { |
353 _locked_seen++; | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
354 SWEEP(nm); |
0 | 355 } |
356 return; | |
357 } | |
358 | |
359 if (nm->is_zombie()) { | |
360 // If it is first time, we see nmethod then we mark it. Otherwise, | |
361 // we reclame it. When we have seen a zombie method twice, we know that | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
362 // there are no inline caches that refer to it. |
0 | 363 if (nm->is_marked_for_reclamation()) { |
364 assert(!nm->is_locked_by_vm(), "must not flush locked nmethods"); | |
941 | 365 if (PrintMethodFlushing && Verbose) { |
1202 | 366 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (marked for reclamation) being flushed", nm->compile_id(), nm); |
941 | 367 } |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
368 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
0 | 369 nm->flush(); |
370 } else { | |
941 | 371 if (PrintMethodFlushing && Verbose) { |
1202 | 372 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (zombie) being marked for reclamation", nm->compile_id(), nm); |
941 | 373 } |
0 | 374 nm->mark_for_reclamation(); |
375 _rescan = true; | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
376 SWEEP(nm); |
0 | 377 } |
378 } else if (nm->is_not_entrant()) { | |
379 // If there is no current activations of this method on the | |
380 // stack we can safely convert it to a zombie method | |
381 if (nm->can_not_entrant_be_converted()) { | |
941 | 382 if (PrintMethodFlushing && Verbose) { |
1202 | 383 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (not entrant) being made zombie", nm->compile_id(), nm); |
941 | 384 } |
0 | 385 nm->make_zombie(); |
386 _rescan = true; | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
387 SWEEP(nm); |
0 | 388 } else { |
389 // Still alive, clean up its inline caches | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
390 MutexLocker cl(CompiledIC_lock); |
0 | 391 nm->cleanup_inline_caches(); |
392 // we coudn't transition this nmethod so don't immediately | |
393 // request a rescan. If this method stays on the stack for a | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
394 // long time we don't want to keep rescanning the code cache. |
0 | 395 _not_entrant_seen_on_stack++; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
396 SWEEP(nm); |
0 | 397 } |
398 } else if (nm->is_unloaded()) { | |
399 // Unloaded code, just make it a zombie | |
941 | 400 if (PrintMethodFlushing && Verbose) |
1202 | 401 tty->print_cr("### Nmethod %3d/" PTR_FORMAT " (unloaded) being made zombie", nm->compile_id(), nm); |
941 | 402 if (nm->is_osr_method()) { |
0 | 403 // No inline caches will ever point to osr methods, so we can just remove it |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
404 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
405 SWEEP(nm); |
0 | 406 nm->flush(); |
407 } else { | |
408 nm->make_zombie(); | |
409 _rescan = true; | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
410 SWEEP(nm); |
0 | 411 } |
412 } else { | |
413 assert(nm->is_alive(), "should be alive"); | |
1202 | 414 |
415 if (UseCodeCacheFlushing) { | |
416 if ((nm->method()->code() != nm) && !(nm->is_locked_by_vm()) && !(nm->is_osr_method()) && | |
417 (_traversals > _was_full_traversal+2) && (((uint)nm->compile_id()) < _highest_marked) && | |
418 CodeCache::needs_flushing()) { | |
419 // This method has not been called since the forced cleanup happened | |
420 nm->make_not_entrant(); | |
421 } | |
422 } | |
423 | |
0 | 424 // Clean-up all inline caches that points to zombie/non-reentrant methods |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
425 MutexLocker cl(CompiledIC_lock); |
0 | 426 nm->cleanup_inline_caches(); |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
2482
diff
changeset
|
427 SWEEP(nm); |
0 | 428 } |
429 } | |
1202 | 430 |
431 // Code cache unloading: when compilers notice the code cache is getting full, | |
432 // they will call a vm op that comes here. This code attempts to speculatively | |
433 // unload the oldest half of the nmethods (based on the compile job id) by | |
434 // saving the old code in a list in the CodeCache. Then | |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
435 // execution resumes. If a method so marked is not called by the second sweeper |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
436 // stack traversal after the current one, the nmethod will be marked non-entrant and |
1202 | 437 // got rid of by normal sweeping. If the method is called, the methodOop's |
438 // _code field is restored and the methodOop/nmethod | |
439 // go back to their normal state. | |
440 void NMethodSweeper::handle_full_code_cache(bool is_full) { | |
441 // Only the first one to notice can advise us to start early cleaning | |
442 if (!is_full){ | |
443 jint old = Atomic::cmpxchg( 1, &_advise_to_sweep, 0 ); | |
444 if (old != 0) { | |
445 return; | |
446 } | |
447 } | |
448 | |
449 if (is_full) { | |
450 // Since code cache is full, immediately stop new compiles | |
451 bool did_set = CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation); | |
452 if (!did_set) { | |
453 // only the first to notice can start the cleaning, | |
454 // others will go back and block | |
455 return; | |
456 } | |
457 set_was_full(true); | |
458 | |
459 // If we run out within MinCodeCacheFlushingInterval of the last unload time, give up | |
460 jlong now = os::javaTimeMillis(); | |
461 jlong max_interval = (jlong)MinCodeCacheFlushingInterval * (jlong)1000; | |
462 jlong curr_interval = now - _last_was_full; | |
463 if (curr_interval < max_interval) { | |
464 _rescan = true; | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
465 log_sweep("disable_compiler", "flushing_interval='" UINT64_FORMAT "'", |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
466 curr_interval/1000); |
1202 | 467 return; |
468 } | |
469 } | |
470 | |
471 VM_HandleFullCodeCache op(is_full); | |
472 VMThread::execute(&op); | |
473 | |
474 // rescan again as soon as possible | |
475 _rescan = true; | |
476 } | |
477 | |
478 void NMethodSweeper::speculative_disconnect_nmethods(bool is_full) { | |
479 // If there was a race in detecting full code cache, only run | |
480 // one vm op for it or keep the compiler shut off | |
481 | |
482 debug_only(jlong start = os::javaTimeMillis();) | |
483 | |
484 if ((!was_full()) && (is_full)) { | |
485 if (!CodeCache::needs_flushing()) { | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
486 log_sweep("restart_compiler"); |
1202 | 487 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation); |
488 return; | |
489 } | |
490 } | |
491 | |
492 // Traverse the code cache trying to dump the oldest nmethods | |
493 uint curr_max_comp_id = CompileBroker::get_compilation_id(); | |
494 uint flush_target = ((curr_max_comp_id - _highest_marked) >> 1) + _highest_marked; | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
495 log_sweep("start_cleaning"); |
1202 | 496 |
497 nmethod* nm = CodeCache::alive_nmethod(CodeCache::first()); | |
498 jint disconnected = 0; | |
499 jint made_not_entrant = 0; | |
500 while ((nm != NULL)){ | |
501 uint curr_comp_id = nm->compile_id(); | |
502 | |
503 // OSR methods cannot be flushed like this. Also, don't flush native methods | |
504 // since they are part of the JDK in most cases | |
505 if (nm->is_in_use() && (!nm->is_osr_method()) && (!nm->is_locked_by_vm()) && | |
506 (!nm->is_native_method()) && ((curr_comp_id < flush_target))) { | |
507 | |
508 if ((nm->method()->code() == nm)) { | |
509 // This method has not been previously considered for | |
510 // unloading or it was restored already | |
511 CodeCache::speculatively_disconnect(nm); | |
512 disconnected++; | |
513 } else if (nm->is_speculatively_disconnected()) { | |
514 // This method was previously considered for preemptive unloading and was not called since then | |
1783 | 515 CompilationPolicy::policy()->delay_compilation(nm->method()); |
1202 | 516 nm->make_not_entrant(); |
517 made_not_entrant++; | |
518 } | |
519 | |
520 if (curr_comp_id > _highest_marked) { | |
521 _highest_marked = curr_comp_id; | |
522 } | |
523 } | |
524 nm = CodeCache::alive_nmethod(CodeCache::next(nm)); | |
525 } | |
526 | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
527 log_sweep("stop_cleaning", |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
528 "disconnected='" UINT32_FORMAT "' made_not_entrant='" UINT32_FORMAT "'", |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
529 disconnected, made_not_entrant); |
1202 | 530 |
1538
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
531 // Shut off compiler. Sweeper will start over with a new stack scan and |
bfe29ec02863
6950075: nmethod sweeper should operate concurrently
never
parents:
1202
diff
changeset
|
532 // traversal cycle and turn it back on if it clears enough space. |
1202 | 533 if (was_full()) { |
534 _last_was_full = os::javaTimeMillis(); | |
535 CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation); | |
536 } | |
537 | |
538 // After two more traversals the sweeper will get rid of unrestored nmethods | |
539 _was_full_traversal = _traversals; | |
540 #ifdef ASSERT | |
541 jlong end = os::javaTimeMillis(); | |
542 if(PrintMethodFlushing && Verbose) { | |
543 tty->print_cr("### sweeper: unload time: " INT64_FORMAT, end-start); | |
544 } | |
545 #endif | |
546 } | |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
547 |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
548 |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
549 // Print out some state information about the current sweep and the |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
550 // state of the code cache if it's requested. |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
551 void NMethodSweeper::log_sweep(const char* msg, const char* format, ...) { |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
552 if (PrintMethodFlushing) { |
2482
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
553 stringStream s; |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
554 // Dump code cache state into a buffer before locking the tty, |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
555 // because log_state() will use locks causing lock conflicts. |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
556 CodeCache::log_state(&s); |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
557 |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
558 ttyLocker ttyl; |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
559 tty->print("### sweeper: %s ", msg); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
560 if (format != NULL) { |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
561 va_list ap; |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
562 va_start(ap, format); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
563 tty->vprint(format, ap); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
564 va_end(ap); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
565 } |
2482
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
566 tty->print_cr(s.as_string()); |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
567 } |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
568 |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
569 if (LogCompilation && (xtty != NULL)) { |
2482
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
570 stringStream s; |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
571 // Dump code cache state into a buffer before locking the tty, |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
572 // because log_state() will use locks causing lock conflicts. |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
573 CodeCache::log_state(&s); |
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
574 |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
575 ttyLocker ttyl; |
1646 | 576 xtty->begin_elem("sweeper state='%s' traversals='" INTX_FORMAT "' ", msg, (intx)traversal_count()); |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
577 if (format != NULL) { |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
578 va_list ap; |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
579 va_start(ap, format); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
580 xtty->vprint(format, ap); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
581 va_end(ap); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
582 } |
2482
dbccacb79c63
7036236: VM crashes assert((!inside_attrs()) || is_error_reported()) failed ...
iveresov
parents:
2426
diff
changeset
|
583 xtty->print(s.as_string()); |
1644
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
584 xtty->stamp(); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
585 xtty->end_elem(); |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
586 } |
2a47bd84841f
6965184: possible races in make_not_entrant_or_zombie
never
parents:
1615
diff
changeset
|
587 } |