Mercurial > hg > graal-compiler

annotate src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp @ 8679:a252e688abcf

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7189971: Implement CMSWaitDuration for non-incremental mode of CMS Reviewed-by: jmasa, johnc, ysr Contributed-by: michal@frajt.eu
author jmasa
date Fri, 01 Feb 2013 17:02:36 -0800
parents f34d701e952e
children de6a9e811145
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1 /*
2365
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
2 * Copyright (c) 2001, 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: 0
diff changeset
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 0
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: 0
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: 1887
diff changeset
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPTHREAD_HPP
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPTHREAD_HPP
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
27
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
28 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
29 #include "gc_implementation/shared/concurrentGCThread.hpp"
7180
f34d701e952e 8003935: Simplify the needed includes for using Thread::current()
stefank
parents: 3960
diff changeset
30 #include "runtime/thread.inline.hpp"
1972
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
31
0
a61af66fc99e Initial load
duke
parents:
diff changeset
32 class ConcurrentMarkSweepGeneration;
a61af66fc99e Initial load
duke
parents:
diff changeset
33 class CMSCollector;
a61af66fc99e Initial load
duke
parents:
diff changeset
34
2365
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
35 // The Concurrent Mark Sweep GC Thread
0
a61af66fc99e Initial load
duke
parents:
diff changeset
36 class ConcurrentMarkSweepThread: public ConcurrentGCThread {
a61af66fc99e Initial load
duke
parents:
diff changeset
37 friend class VMStructs;
a61af66fc99e Initial load
duke
parents:
diff changeset
38 friend class ConcurrentMarkSweepGeneration; // XXX should remove friendship
a61af66fc99e Initial load
duke
parents:
diff changeset
39 friend class CMSCollector;
a61af66fc99e Initial load
duke
parents:
diff changeset
40 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
41 virtual void run();
a61af66fc99e Initial load
duke
parents:
diff changeset
42
a61af66fc99e Initial load
duke
parents:
diff changeset
43 private:
a61af66fc99e Initial load
duke
parents:
diff changeset
44 static ConcurrentMarkSweepThread* _cmst;
a61af66fc99e Initial load
duke
parents:
diff changeset
45 static CMSCollector* _collector;
a61af66fc99e Initial load
duke
parents:
diff changeset
46 static SurrogateLockerThread* _slt;
a61af66fc99e Initial load
duke
parents:
diff changeset
47 static SurrogateLockerThread::SLT_msg_type _sltBuffer;
a61af66fc99e Initial load
duke
parents:
diff changeset
48 static Monitor* _sltMonitor;
a61af66fc99e Initial load
duke
parents:
diff changeset
49
a61af66fc99e Initial load
duke
parents:
diff changeset
50 static bool _should_terminate;
a61af66fc99e Initial load
duke
parents:
diff changeset
51
a61af66fc99e Initial load
duke
parents:
diff changeset
52 enum CMS_flag_type {
a61af66fc99e Initial load
duke
parents:
diff changeset
53 CMS_nil = NoBits,
a61af66fc99e Initial load
duke
parents:
diff changeset
54 CMS_cms_wants_token = nth_bit(0),
a61af66fc99e Initial load
duke
parents:
diff changeset
55 CMS_cms_has_token = nth_bit(1),
a61af66fc99e Initial load
duke
parents:
diff changeset
56 CMS_vm_wants_token = nth_bit(2),
a61af66fc99e Initial load
duke
parents:
diff changeset
57 CMS_vm_has_token = nth_bit(3)
a61af66fc99e Initial load
duke
parents:
diff changeset
58 };
a61af66fc99e Initial load
duke
parents:
diff changeset
59
a61af66fc99e Initial load
duke
parents:
diff changeset
60 static int _CMS_flag;
a61af66fc99e Initial load
duke
parents:
diff changeset
61
a61af66fc99e Initial load
duke
parents:
diff changeset
62 static bool CMS_flag_is_set(int b) { return (_CMS_flag & b) != 0; }
a61af66fc99e Initial load
duke
parents:
diff changeset
63 static bool set_CMS_flag(int b) { return (_CMS_flag |= b) != 0; }
a61af66fc99e Initial load
duke
parents:
diff changeset
64 static bool clear_CMS_flag(int b) { return (_CMS_flag &= ~b) != 0; }
a61af66fc99e Initial load
duke
parents:
diff changeset
65 void sleepBeforeNextCycle();
a61af66fc99e Initial load
duke
parents:
diff changeset
66
a61af66fc99e Initial load
duke
parents:
diff changeset
67 // CMS thread should yield for a young gen collection, direct allocation,
a61af66fc99e Initial load
duke
parents:
diff changeset
68 // and iCMS activity.
a61af66fc99e Initial load
duke
parents:
diff changeset
69 static char _pad_1[64 - sizeof(jint)]; // prevent cache-line sharing
a61af66fc99e Initial load
duke
parents:
diff changeset
70 static volatile jint _pending_yields;
a61af66fc99e Initial load
duke
parents:
diff changeset
71 static volatile jint _pending_decrements; // decrements to _pending_yields
a61af66fc99e Initial load
duke
parents:
diff changeset
72 static char _pad_2[64 - sizeof(jint)]; // prevent cache-line sharing
a61af66fc99e Initial load
duke
parents:
diff changeset
73
a61af66fc99e Initial load
duke
parents:
diff changeset
74 // Tracing messages, enabled by CMSTraceThreadState.
a61af66fc99e Initial load
duke
parents:
diff changeset
75 static inline void trace_state(const char* desc);
a61af66fc99e Initial load
duke
parents:
diff changeset
76
2365
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
77 static volatile int _icms_disabled; // a counter to track #iCMS disable & enable
0
a61af66fc99e Initial load
duke
parents:
diff changeset
78 static volatile bool _should_run; // iCMS may run
a61af66fc99e Initial load
duke
parents:
diff changeset
79 static volatile bool _should_stop; // iCMS should stop
a61af66fc99e Initial load
duke
parents:
diff changeset
80
a61af66fc99e Initial load
duke
parents:
diff changeset
81 // debugging
a61af66fc99e Initial load
duke
parents:
diff changeset
82 void verify_ok_to_terminate() const PRODUCT_RETURN;
a61af66fc99e Initial load
duke
parents:
diff changeset
83
a61af66fc99e Initial load
duke
parents:
diff changeset
84 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
85 // Constructor
a61af66fc99e Initial load
duke
parents:
diff changeset
86 ConcurrentMarkSweepThread(CMSCollector* collector);
a61af66fc99e Initial load
duke
parents:
diff changeset
87
a61af66fc99e Initial load
duke
parents:
diff changeset
88 static void makeSurrogateLockerThread(TRAPS);
a61af66fc99e Initial load
duke
parents:
diff changeset
89 static SurrogateLockerThread* slt() { return _slt; }
a61af66fc99e Initial load
duke
parents:
diff changeset
90
a61af66fc99e Initial load
duke
parents:
diff changeset
91 // Tester
a61af66fc99e Initial load
duke
parents:
diff changeset
92 bool is_ConcurrentGC_thread() const { return true; }
a61af66fc99e Initial load
duke
parents:
diff changeset
93
a61af66fc99e Initial load
duke
parents:
diff changeset
94 static void threads_do(ThreadClosure* tc);
a61af66fc99e Initial load
duke
parents:
diff changeset
95
a61af66fc99e Initial load
duke
parents:
diff changeset
96 // Printing
a61af66fc99e Initial load
duke
parents:
diff changeset
97 void print_on(outputStream* st) const;
a61af66fc99e Initial load
duke
parents:
diff changeset
98 void print() const { print_on(tty); }
a61af66fc99e Initial load
duke
parents:
diff changeset
99 static void print_all_on(outputStream* st);
a61af66fc99e Initial load
duke
parents:
diff changeset
100 static void print_all() { print_all_on(tty); }
a61af66fc99e Initial load
duke
parents:
diff changeset
101
a61af66fc99e Initial load
duke
parents:
diff changeset
102 // Returns the CMS Thread
a61af66fc99e Initial load
duke
parents:
diff changeset
103 static ConcurrentMarkSweepThread* cmst() { return _cmst; }
a61af66fc99e Initial load
duke
parents:
diff changeset
104 static CMSCollector* collector() { return _collector; }
a61af66fc99e Initial load
duke
parents:
diff changeset
105
a61af66fc99e Initial load
duke
parents:
diff changeset
106 // Create and start the CMS Thread, or stop it on shutdown
a61af66fc99e Initial load
duke
parents:
diff changeset
107 static ConcurrentMarkSweepThread* start(CMSCollector* collector);
a61af66fc99e Initial load
duke
parents:
diff changeset
108 static void stop();
a61af66fc99e Initial load
duke
parents:
diff changeset
109 static bool should_terminate() { return _should_terminate; }
a61af66fc99e Initial load
duke
parents:
diff changeset
110
a61af66fc99e Initial load
duke
parents:
diff changeset
111 // Synchronization using CMS token
a61af66fc99e Initial load
duke
parents:
diff changeset
112 static void synchronize(bool is_cms_thread);
a61af66fc99e Initial load
duke
parents:
diff changeset
113 static void desynchronize(bool is_cms_thread);
a61af66fc99e Initial load
duke
parents:
diff changeset
114 static bool vm_thread_has_cms_token() {
a61af66fc99e Initial load
duke
parents:
diff changeset
115 return CMS_flag_is_set(CMS_vm_has_token);
a61af66fc99e Initial load
duke
parents:
diff changeset
116 }
a61af66fc99e Initial load
duke
parents:
diff changeset
117 static bool cms_thread_has_cms_token() {
a61af66fc99e Initial load
duke
parents:
diff changeset
118 return CMS_flag_is_set(CMS_cms_has_token);
a61af66fc99e Initial load
duke
parents:
diff changeset
119 }
a61af66fc99e Initial load
duke
parents:
diff changeset
120 static bool vm_thread_wants_cms_token() {
a61af66fc99e Initial load
duke
parents:
diff changeset
121 return CMS_flag_is_set(CMS_vm_wants_token);
a61af66fc99e Initial load
duke
parents:
diff changeset
122 }
a61af66fc99e Initial load
duke
parents:
diff changeset
123 static bool cms_thread_wants_cms_token() {
a61af66fc99e Initial load
duke
parents:
diff changeset
124 return CMS_flag_is_set(CMS_cms_wants_token);
a61af66fc99e Initial load
duke
parents:
diff changeset
125 }
a61af66fc99e Initial load
duke
parents:
diff changeset
126
a61af66fc99e Initial load
duke
parents:
diff changeset
127 // Wait on CMS lock until the next synchronous GC
1887
cd3ef3fd20dd 6992998: CMSWaitDuration=0 causes hangs with +ExplicitGCInvokesConcurrent
ysr
parents: 1837
diff changeset
128 // or given timeout, whichever is earlier. A timeout value
cd3ef3fd20dd 6992998: CMSWaitDuration=0 causes hangs with +ExplicitGCInvokesConcurrent
ysr
parents: 1837
diff changeset
129 // of 0 indicates that there is no upper bound on the wait time.
cd3ef3fd20dd 6992998: CMSWaitDuration=0 causes hangs with +ExplicitGCInvokesConcurrent
ysr
parents: 1837
diff changeset
130 // A concurrent full gc request terminates the wait.
cd3ef3fd20dd 6992998: CMSWaitDuration=0 causes hangs with +ExplicitGCInvokesConcurrent
ysr
parents: 1837
diff changeset
131 void wait_on_cms_lock(long t_millis);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
132
8679
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
133 // Wait on CMS lock until the next synchronous GC
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
134 // or given timeout, whichever is earlier. A timeout value
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
135 // of 0 indicates that there is no upper bound on the wait time.
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
136 // A concurrent full gc request terminates the wait.
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
137 void wait_on_cms_lock_for_scavenge(long t_millis);
a252e688abcf 7189971: Implement CMSWaitDuration for non-incremental mode of CMS
jmasa
parents: 7180
diff changeset
138
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
139 // The CMS thread will yield during the work portion of its cycle
0
a61af66fc99e Initial load
duke
parents:
diff changeset
140 // only when requested to. Both synchronous and asychronous requests
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
141 // are provided:
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
142 // (1) A synchronous request is used for young gen collections and
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
143 // for direct allocations. The requesting thread increments
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
144 // _pending_yields at the beginning of an operation, and decrements
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
145 // _pending_yields when that operation is completed.
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
146 // In turn, the CMS thread yields when _pending_yields is positive,
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
147 // and continues to yield until the value reverts to 0.
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
148 // (2) An asynchronous request, on the other hand, is used by iCMS
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
149 // for the stop_icms() operation. A single yield satisfies all of
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
150 // the outstanding asynch yield requests, of which there may
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
151 // occasionally be several in close succession. To accomplish
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
152 // this, an asynch-requesting thread atomically increments both
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
153 // _pending_yields and _pending_decrements. An asynchr requesting
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
154 // thread does not wait and "acknowledge" completion of an operation
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
155 // and deregister the request, like the synchronous version described
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
156 // above does. In turn, after yielding, the CMS thread decrements both
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
157 // _pending_yields and _pending_decrements by the value seen in
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
158 // _pending_decrements before the decrement.
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
159 // NOTE: The above scheme is isomorphic to having two request counters,
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
160 // one for async requests and one for sync requests, and for the CMS thread
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
161 // to check the sum of the two counters to decide whether it should yield
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
162 // and to clear only the async counter when it yields. However, it turns out
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
163 // to be more efficient for CMS code to just check a single counter
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
164 // _pending_yields that holds the sum (of both sync and async requests), and
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
165 // a second counter _pending_decrements that only holds the async requests,
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
166 // for greater efficiency, since in a typical CMS run, there are many more
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
167 // pontential (i.e. static) yield points than there are actual
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
168 // (i.e. dynamic) yields because of requests, which are few and far between.
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
169 //
0
a61af66fc99e Initial load
duke
parents:
diff changeset
170 // Note that, while "_pending_yields >= _pending_decrements" is an invariant,
a61af66fc99e Initial load
duke
parents:
diff changeset
171 // we cannot easily test that invariant, since the counters are manipulated via
a61af66fc99e Initial load
duke
parents:
diff changeset
172 // atomic instructions without explicit locking and we cannot read
a61af66fc99e Initial load
duke
parents:
diff changeset
173 // the two counters atomically together: one suggestion is to
a61af66fc99e Initial load
duke
parents:
diff changeset
174 // use (for example) 16-bit counters so as to be able to read the
a61af66fc99e Initial load
duke
parents:
diff changeset
175 // two counters atomically even on 32-bit platforms. Notice that
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
176 // the second assert in acknowledge_yield_request() below does indeed
0
a61af66fc99e Initial load
duke
parents:
diff changeset
177 // check a form of the above invariant, albeit indirectly.
a61af66fc99e Initial load
duke
parents:
diff changeset
178
a61af66fc99e Initial load
duke
parents:
diff changeset
179 static void increment_pending_yields() {
a61af66fc99e Initial load
duke
parents:
diff changeset
180 Atomic::inc(&_pending_yields);
a61af66fc99e Initial load
duke
parents:
diff changeset
181 assert(_pending_yields >= 0, "can't be negative");
a61af66fc99e Initial load
duke
parents:
diff changeset
182 }
a61af66fc99e Initial load
duke
parents:
diff changeset
183 static void decrement_pending_yields() {
a61af66fc99e Initial load
duke
parents:
diff changeset
184 Atomic::dec(&_pending_yields);
a61af66fc99e Initial load
duke
parents:
diff changeset
185 assert(_pending_yields >= 0, "can't be negative");
a61af66fc99e Initial load
duke
parents:
diff changeset
186 }
a61af66fc99e Initial load
duke
parents:
diff changeset
187 static void asynchronous_yield_request() {
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
188 assert(CMSIncrementalMode, "Currently only used w/iCMS");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
189 increment_pending_yields();
a61af66fc99e Initial load
duke
parents:
diff changeset
190 Atomic::inc(&_pending_decrements);
a61af66fc99e Initial load
duke
parents:
diff changeset
191 assert(_pending_decrements >= 0, "can't be negative");
a61af66fc99e Initial load
duke
parents:
diff changeset
192 }
a61af66fc99e Initial load
duke
parents:
diff changeset
193 static void acknowledge_yield_request() {
a61af66fc99e Initial load
duke
parents:
diff changeset
194 jint decrement = _pending_decrements;
a61af66fc99e Initial load
duke
parents:
diff changeset
195 if (decrement > 0) {
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
196 assert(CMSIncrementalMode, "Currently only used w/iCMS");
0
a61af66fc99e Initial load
duke
parents:
diff changeset
197 // Order important to preserve: _pending_yields >= _pending_decrements
a61af66fc99e Initial load
duke
parents:
diff changeset
198 Atomic::add(-decrement, &_pending_decrements);
a61af66fc99e Initial load
duke
parents:
diff changeset
199 Atomic::add(-decrement, &_pending_yields);
a61af66fc99e Initial load
duke
parents:
diff changeset
200 assert(_pending_decrements >= 0, "can't be negative");
a61af66fc99e Initial load
duke
parents:
diff changeset
201 assert(_pending_yields >= 0, "can't be negative");
a61af66fc99e Initial load
duke
parents:
diff changeset
202 }
a61af66fc99e Initial load
duke
parents:
diff changeset
203 }
a61af66fc99e Initial load
duke
parents:
diff changeset
204 static bool should_yield() { return _pending_yields > 0; }
a61af66fc99e Initial load
duke
parents:
diff changeset
205
a61af66fc99e Initial load
duke
parents:
diff changeset
206 // CMS incremental mode.
a61af66fc99e Initial load
duke
parents:
diff changeset
207 static void start_icms(); // notify thread to start a quantum of work
a61af66fc99e Initial load
duke
parents:
diff changeset
208 static void stop_icms(); // request thread to stop working
a61af66fc99e Initial load
duke
parents:
diff changeset
209 void icms_wait(); // if asked to stop, wait until notified to start
a61af66fc99e Initial load
duke
parents:
diff changeset
210
a61af66fc99e Initial load
duke
parents:
diff changeset
211 // Incremental mode is enabled globally by the flag CMSIncrementalMode. It
a61af66fc99e Initial load
duke
parents:
diff changeset
212 // must also be enabled/disabled dynamically to allow foreground collections.
2365
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
213 #define ICMS_ENABLING_ASSERT \
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
214 assert((CMSIncrementalMode && _icms_disabled >= 0) || \
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
215 (!CMSIncrementalMode && _icms_disabled <= 0), "Error")
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
216
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
217 static inline void enable_icms() {
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
218 ICMS_ENABLING_ASSERT;
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
219 Atomic::dec(&_icms_disabled);
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
220 }
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
221 static inline void disable_icms() {
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
222 ICMS_ENABLING_ASSERT;
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
223 Atomic::inc(&_icms_disabled);
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
224 }
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
225 static inline bool icms_is_disabled() {
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
226 ICMS_ENABLING_ASSERT;
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
227 return _icms_disabled > 0;
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
228 }
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
229 static inline bool icms_is_enabled() {
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
230 return !icms_is_disabled();
a181f3a124dd 6987703: iCMS: Intermittent hang with gc/gctests/CallGC/CallGC01 and +ExplicitGCInvokesConcurrent
ysr
parents: 1972
diff changeset
231 }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
232 };
a61af66fc99e Initial load
duke
parents:
diff changeset
233
a61af66fc99e Initial load
duke
parents:
diff changeset
234 inline void ConcurrentMarkSweepThread::trace_state(const char* desc) {
a61af66fc99e Initial load
duke
parents:
diff changeset
235 if (CMSTraceThreadState) {
a61af66fc99e Initial load
duke
parents:
diff changeset
236 char buf[128];
a61af66fc99e Initial load
duke
parents:
diff changeset
237 TimeStamp& ts = gclog_or_tty->time_stamp();
a61af66fc99e Initial load
duke
parents:
diff changeset
238 if (!ts.is_updated()) {
a61af66fc99e Initial load
duke
parents:
diff changeset
239 ts.update();
a61af66fc99e Initial load
duke
parents:
diff changeset
240 }
a61af66fc99e Initial load
duke
parents:
diff changeset
241 jio_snprintf(buf, sizeof(buf), " [%.3f: CMSThread %s] ",
a61af66fc99e Initial load
duke
parents:
diff changeset
242 ts.seconds(), desc);
a61af66fc99e Initial load
duke
parents:
diff changeset
243 buf[sizeof(buf) - 1] = '\0';
a61af66fc99e Initial load
duke
parents:
diff changeset
244 gclog_or_tty->print(buf);
a61af66fc99e Initial load
duke
parents:
diff changeset
245 }
a61af66fc99e Initial load
duke
parents:
diff changeset
246 }
a61af66fc99e Initial load
duke
parents:
diff changeset
247
1837
c99c53f07c14 6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
ysr
parents: 1552
diff changeset
248 // For scoped increment/decrement of (synchronous) yield requests
0
a61af66fc99e Initial load
duke
parents:
diff changeset
249 class CMSSynchronousYieldRequest: public StackObj {
a61af66fc99e Initial load
duke
parents:
diff changeset
250 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
251 CMSSynchronousYieldRequest() {
a61af66fc99e Initial load
duke
parents:
diff changeset
252 ConcurrentMarkSweepThread::increment_pending_yields();
a61af66fc99e Initial load
duke
parents:
diff changeset
253 }
a61af66fc99e Initial load
duke
parents:
diff changeset
254 ~CMSSynchronousYieldRequest() {
a61af66fc99e Initial load
duke
parents:
diff changeset
255 ConcurrentMarkSweepThread::decrement_pending_yields();
a61af66fc99e Initial load
duke
parents:
diff changeset
256 }
a61af66fc99e Initial load
duke
parents:
diff changeset
257 };
a61af66fc99e Initial load
duke
parents:
diff changeset
258
a61af66fc99e Initial load
duke
parents:
diff changeset
259 // Used to emit a warning in case of unexpectedly excessive
a61af66fc99e Initial load
duke
parents:
diff changeset
260 // looping (in "apparently endless loops") in CMS code.
a61af66fc99e Initial load
duke
parents:
diff changeset
261 class CMSLoopCountWarn: public StackObj {
a61af66fc99e Initial load
duke
parents:
diff changeset
262 private:
a61af66fc99e Initial load
duke
parents:
diff changeset
263 const char* _src;
a61af66fc99e Initial load
duke
parents:
diff changeset
264 const char* _msg;
a61af66fc99e Initial load
duke
parents:
diff changeset
265 const intx _threshold;
a61af66fc99e Initial load
duke
parents:
diff changeset
266 intx _ticks;
a61af66fc99e Initial load
duke
parents:
diff changeset
267
a61af66fc99e Initial load
duke
parents:
diff changeset
268 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
269 inline CMSLoopCountWarn(const char* src, const char* msg,
a61af66fc99e Initial load
duke
parents:
diff changeset
270 const intx threshold) :
a61af66fc99e Initial load
duke
parents:
diff changeset
271 _src(src), _msg(msg), _threshold(threshold), _ticks(0) { }
a61af66fc99e Initial load
duke
parents:
diff changeset
272
a61af66fc99e Initial load
duke
parents:
diff changeset
273 inline void tick() {
a61af66fc99e Initial load
duke
parents:
diff changeset
274 _ticks++;
a61af66fc99e Initial load
duke
parents:
diff changeset
275 if (CMSLoopWarn && _ticks % _threshold == 0) {
a61af66fc99e Initial load
duke
parents:
diff changeset
276 warning("%s has looped %d times %s", _src, _ticks, _msg);
a61af66fc99e Initial load
duke
parents:
diff changeset
277 }
a61af66fc99e Initial load
duke
parents:
diff changeset
278 }
a61af66fc99e Initial load
duke
parents:
diff changeset
279 };
1972
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
280
f95d63e2154a 6989984: Use standard include model for Hospot
stefank
parents: 1887
diff changeset
281 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_CONCURRENTMARKSWEEPTHREAD_HPP