1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/dtraceAttacher.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,138 @@
1.4 +/*
1.5 + * Copyright 2006-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_dtraceAttacher.cpp.incl"
1.30 +
1.31 +#ifdef SOLARIS
1.32 +
1.33 +class VM_DeoptimizeTheWorld : public VM_Operation {
1.34 + public:
1.35 + VMOp_Type type() const {
1.36 + return VMOp_DeoptimizeTheWorld;
1.37 + }
1.38 + void doit() {
1.39 + CodeCache::mark_all_nmethods_for_deoptimization();
1.40 + ResourceMark rm;
1.41 + DeoptimizationMarker dm;
1.42 + // Deoptimize all activations depending on marked methods
1.43 + Deoptimization::deoptimize_dependents();
1.44 +
1.45 + // Mark the dependent methods non entrant
1.46 + CodeCache::make_marked_nmethods_not_entrant();
1.47 + }
1.48 +};
1.49 +
1.50 +static void set_bool_flag(const char* flag, bool value) {
1.51 + CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
1.52 + ATTACH_ON_DEMAND);
1.53 +}
1.54 +
1.55 +// Enable only the "fine grained" flags. Do *not* touch
1.56 +// the overall "ExtendedDTraceProbes" flag.
1.57 +void DTrace::enable_dprobes(int probes) {
1.58 + bool changed = false;
1.59 + if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
1.60 + set_bool_flag("DTraceAllocProbes", true);
1.61 + changed = true;
1.62 + }
1.63 + if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
1.64 + set_bool_flag("DTraceMethodProbes", true);
1.65 + changed = true;
1.66 + }
1.67 + if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
1.68 + set_bool_flag("DTraceMonitorProbes", true);
1.69 + changed = true;
1.70 + }
1.71 +
1.72 + if (changed) {
1.73 + // one or more flags changed, need to deoptimize
1.74 + VM_DeoptimizeTheWorld op;
1.75 + VMThread::execute(&op);
1.76 + }
1.77 +}
1.78 +
1.79 +// Disable only the "fine grained" flags. Do *not* touch
1.80 +// the overall "ExtendedDTraceProbes" flag.
1.81 +void DTrace::disable_dprobes(int probes) {
1.82 + bool changed = false;
1.83 + if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
1.84 + set_bool_flag("DTraceAllocProbes", false);
1.85 + changed = true;
1.86 + }
1.87 + if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
1.88 + set_bool_flag("DTraceMethodProbes", false);
1.89 + changed = true;
1.90 + }
1.91 + if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
1.92 + set_bool_flag("DTraceMonitorProbes", false);
1.93 + changed = true;
1.94 + }
1.95 + if (changed) {
1.96 + // one or more flags changed, need to deoptimize
1.97 + VM_DeoptimizeTheWorld op;
1.98 + VMThread::execute(&op);
1.99 + }
1.100 +}
1.101 +
1.102 +// Do clean-up on "all door clients detached" event.
1.103 +void DTrace::detach_all_clients() {
1.104 + /*
1.105 + * We restore the state of the fine grained flags
1.106 + * to be consistent with overall ExtendedDTraceProbes.
1.107 + * This way, we will honour command line setting or the
1.108 + * last explicit modification of ExtendedDTraceProbes by
1.109 + * a call to set_extended_dprobes.
1.110 + */
1.111 + if (ExtendedDTraceProbes) {
1.112 + enable_dprobes(DTRACE_ALL_PROBES);
1.113 + } else {
1.114 + disable_dprobes(DTRACE_ALL_PROBES);
1.115 + }
1.116 +}
1.117 +
1.118 +void DTrace::set_extended_dprobes(bool flag) {
1.119 + // explicit setting of ExtendedDTraceProbes flag
1.120 + set_bool_flag("ExtendedDTraceProbes", flag);
1.121 +
1.122 + // make sure that the fine grained flags reflect the change.
1.123 + if (flag) {
1.124 + enable_dprobes(DTRACE_ALL_PROBES);
1.125 + } else {
1.126 + /*
1.127 + * FIXME: Revisit this: currently all-client-detach detection
1.128 + * does not work and hence disabled. The following scheme does
1.129 + * not work. So, we have to disable fine-grained flags here.
1.130 + *
1.131 + * disable_dprobes call has to be delayed till next "detach all "event.
1.132 + * This is to be done so that concurrent DTrace clients that may
1.133 + * have enabled one or more fine grained dprobes and may be running
1.134 + * still. On "detach all" clients event, we would sync ExtendedDTraceProbes
1.135 + * with fine grained flags which would take care of disabling fine grained flags.
1.136 + */
1.137 + disable_dprobes(DTRACE_ALL_PROBES);
1.138 + }
1.139 +}
1.140 +
1.141 +#endif /* SOLARIS */
