1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/dtraceAttacher.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,148 @@
1.4 +/*
1.5 + * Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "code/codeCache.hpp"
1.30 +#include "memory/resourceArea.hpp"
1.31 +#include "runtime/deoptimization.hpp"
1.32 +#include "runtime/vmThread.hpp"
1.33 +#include "runtime/vm_operations.hpp"
1.34 +#include "services/dtraceAttacher.hpp"
1.35 +
1.36 +#ifdef SOLARIS
1.37 +
1.38 +class VM_DeoptimizeTheWorld : public VM_Operation {
1.39 + public:
1.40 + VMOp_Type type() const {
1.41 + return VMOp_DeoptimizeTheWorld;
1.42 + }
1.43 + void doit() {
1.44 + CodeCache::mark_all_nmethods_for_deoptimization();
1.45 + ResourceMark rm;
1.46 + DeoptimizationMarker dm;
1.47 + // Deoptimize all activations depending on marked methods
1.48 + Deoptimization::deoptimize_dependents();
1.49 +
1.50 + // Mark the dependent methods non entrant
1.51 + CodeCache::make_marked_nmethods_not_entrant();
1.52 + }
1.53 +};
1.54 +
1.55 +static void set_bool_flag(const char* flag, bool value) {
1.56 + CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
1.57 + Flag::ATTACH_ON_DEMAND);
1.58 +}
1.59 +
1.60 +// Enable only the "fine grained" flags. Do *not* touch
1.61 +// the overall "ExtendedDTraceProbes" flag.
1.62 +void DTrace::enable_dprobes(int probes) {
1.63 + bool changed = false;
1.64 + if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
1.65 + set_bool_flag("DTraceAllocProbes", true);
1.66 + changed = true;
1.67 + }
1.68 + if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
1.69 + set_bool_flag("DTraceMethodProbes", true);
1.70 + changed = true;
1.71 + }
1.72 + if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
1.73 + set_bool_flag("DTraceMonitorProbes", true);
1.74 + changed = true;
1.75 + }
1.76 +
1.77 + if (changed) {
1.78 + // one or more flags changed, need to deoptimize
1.79 + VM_DeoptimizeTheWorld op;
1.80 + VMThread::execute(&op);
1.81 + }
1.82 +}
1.83 +
1.84 +// Disable only the "fine grained" flags. Do *not* touch
1.85 +// the overall "ExtendedDTraceProbes" flag.
1.86 +void DTrace::disable_dprobes(int probes) {
1.87 + bool changed = false;
1.88 + if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
1.89 + set_bool_flag("DTraceAllocProbes", false);
1.90 + changed = true;
1.91 + }
1.92 + if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
1.93 + set_bool_flag("DTraceMethodProbes", false);
1.94 + changed = true;
1.95 + }
1.96 + if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
1.97 + set_bool_flag("DTraceMonitorProbes", false);
1.98 + changed = true;
1.99 + }
1.100 + if (changed) {
1.101 + // one or more flags changed, need to deoptimize
1.102 + VM_DeoptimizeTheWorld op;
1.103 + VMThread::execute(&op);
1.104 + }
1.105 +}
1.106 +
1.107 +// Do clean-up on "all door clients detached" event.
1.108 +void DTrace::detach_all_clients() {
1.109 + /*
1.110 + * We restore the state of the fine grained flags
1.111 + * to be consistent with overall ExtendedDTraceProbes.
1.112 + * This way, we will honour command line setting or the
1.113 + * last explicit modification of ExtendedDTraceProbes by
1.114 + * a call to set_extended_dprobes.
1.115 + */
1.116 + if (ExtendedDTraceProbes) {
1.117 + enable_dprobes(DTRACE_ALL_PROBES);
1.118 + } else {
1.119 + disable_dprobes(DTRACE_ALL_PROBES);
1.120 + }
1.121 +}
1.122 +
1.123 +void DTrace::set_extended_dprobes(bool flag) {
1.124 + // explicit setting of ExtendedDTraceProbes flag
1.125 + set_bool_flag("ExtendedDTraceProbes", flag);
1.126 +
1.127 + // make sure that the fine grained flags reflect the change.
1.128 + if (flag) {
1.129 + enable_dprobes(DTRACE_ALL_PROBES);
1.130 + } else {
1.131 + /*
1.132 + * FIXME: Revisit this: currently all-client-detach detection
1.133 + * does not work and hence disabled. The following scheme does
1.134 + * not work. So, we have to disable fine-grained flags here.
1.135 + *
1.136 + * disable_dprobes call has to be delayed till next "detach all "event.
1.137 + * This is to be done so that concurrent DTrace clients that may
1.138 + * have enabled one or more fine grained dprobes and may be running
1.139 + * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
1.140 + * with fine grained flags which would take care of disabling fine grained flags.
1.141 + */
1.142 + disable_dprobes(DTRACE_ALL_PROBES);
1.143 + }
1.144 +}
1.145 +
1.146 +void DTrace::set_monitor_dprobes(bool flag) {
1.147 + // explicit setting of DTraceMonitorProbes flag
1.148 + set_bool_flag("DTraceMonitorProbes", flag);
1.149 +}
1.150 +
1.151 +#endif /* SOLARIS */
