1 /*
2 * Copyright (c) 2006, 2018, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "code/codeCache.hpp"
27 #include "memory/resourceArea.hpp"
28 #include "runtime/deoptimization.hpp"
29 #include "runtime/flags/jvmFlag.hpp"
30 #include "runtime/vmThread.hpp"
31 #include "runtime/vmOperations.hpp"
32 #include "services/dtraceAttacher.hpp"
33
34 #ifdef SOLARIS
35
36 class VM_DeoptimizeTheWorld : public VM_Operation {
37 public:
38 VMOp_Type type() const {
39 return VMOp_DeoptimizeTheWorld;
40 }
41 void doit() {
42 CodeCache::mark_all_nmethods_for_deoptimization();
43 ResourceMark rm;
44 DeoptimizationMarker dm;
45 // Deoptimize all activations depending on marked methods
46 Deoptimization::deoptimize_dependents();
47
48 // Mark the dependent methods non entrant
49 CodeCache::make_marked_nmethods_not_entrant();
50 }
51 };
52
53 static void set_bool_flag(const char* name, bool value) {
54 JVMFlag* flag = JVMFlag::find_flag(name);
55 JVMFlag::boolAtPut(flag, &value, JVMFlag::ATTACH_ON_DEMAND);
56 }
57
58 // Enable only the "fine grained" flags. Do *not* touch
59 // the overall "ExtendedDTraceProbes" flag.
60 void DTrace::enable_dprobes(int probes) {
61 bool changed = false;
62 if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
63 set_bool_flag("DTraceAllocProbes", true);
64 changed = true;
65 }
66 if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
67 set_bool_flag("DTraceMethodProbes", true);
68 changed = true;
69 }
70 if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
71 set_bool_flag("DTraceMonitorProbes", true);
72 changed = true;
73 }
74
75 if (changed) {
76 // one or more flags changed, need to deoptimize
77 VM_DeoptimizeTheWorld op;
78 VMThread::execute(&op);
79 }
80 }
81
82 // Disable only the "fine grained" flags. Do *not* touch
83 // the overall "ExtendedDTraceProbes" flag.
84 void DTrace::disable_dprobes(int probes) {
85 bool changed = false;
86 if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
87 set_bool_flag("DTraceAllocProbes", false);
88 changed = true;
89 }
90 if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
91 set_bool_flag("DTraceMethodProbes", false);
92 changed = true;
93 }
94 if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
95 set_bool_flag("DTraceMonitorProbes", false);
96 changed = true;
97 }
98 if (changed) {
99 // one or more flags changed, need to deoptimize
100 VM_DeoptimizeTheWorld op;
101 VMThread::execute(&op);
102 }
103 }
104
105 // Do clean-up on "all door clients detached" event.
106 void DTrace::detach_all_clients() {
107 /*
108 * We restore the state of the fine grained flags
109 * to be consistent with overall ExtendedDTraceProbes.
110 * This way, we will honour command line setting or the
111 * last explicit modification of ExtendedDTraceProbes by
112 * a call to set_extended_dprobes.
113 */
114 if (ExtendedDTraceProbes) {
115 enable_dprobes(DTRACE_ALL_PROBES);
116 } else {
117 disable_dprobes(DTRACE_ALL_PROBES);
118 }
119 }
120
121 void DTrace::set_extended_dprobes(bool flag) {
122 // explicit setting of ExtendedDTraceProbes flag
123 set_bool_flag("ExtendedDTraceProbes", flag);
124
125 // make sure that the fine grained flags reflect the change.
126 if (flag) {
127 enable_dprobes(DTRACE_ALL_PROBES);
128 } else {
129 /*
130 * FIXME: Revisit this: currently all-client-detach detection
131 * does not work and hence disabled. The following scheme does
132 * not work. So, we have to disable fine-grained flags here.
133 *
134 * disable_dprobes call has to be delayed till next "detach all "event.
135 * This is to be done so that concurrent DTrace clients that may
136 * have enabled one or more fine grained dprobes and may be running
137 * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
138 * with fine grained flags which would take care of disabling fine grained flags.
139 */
140 disable_dprobes(DTRACE_ALL_PROBES);
141 }
142 }
143
144 void DTrace::set_monitor_dprobes(bool flag) {
145 // explicit setting of DTraceMonitorProbes flag
146 set_bool_flag("DTraceMonitorProbes", flag);
147 }
148
149 #endif /* SOLARIS */