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/*
* Copyright 2006-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
# include "incls/_precompiled.incl"
# include "incls/_dtraceAttacher.cpp.incl"
#ifdef SOLARIS
class VM_DeoptimizeTheWorld : public VM_Operation {
public:
VMOp_Type type() const {
return VMOp_DeoptimizeTheWorld;
}
void doit() {
CodeCache::mark_all_nmethods_for_deoptimization();
ResourceMark rm;
DeoptimizationMarker dm;
// Deoptimize all activations depending on marked methods
Deoptimization::deoptimize_dependents();
// Mark the dependent methods non entrant
CodeCache::make_marked_nmethods_not_entrant();
}
};
static void set_bool_flag(const char* flag, bool value) {
CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
ATTACH_ON_DEMAND);
}
// Enable only the "fine grained" flags. Do *not* touch
// the overall "ExtendedDTraceProbes" flag.
void DTrace::enable_dprobes(int probes) {
bool changed = false;
if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
set_bool_flag("DTraceAllocProbes", true);
changed = true;
}
if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
set_bool_flag("DTraceMethodProbes", true);
changed = true;
}
if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
set_bool_flag("DTraceMonitorProbes", true);
changed = true;
}
if (changed) {
// one or more flags changed, need to deoptimize
VM_DeoptimizeTheWorld op;
VMThread::execute(&op);
}
}
// Disable only the "fine grained" flags. Do *not* touch
// the overall "ExtendedDTraceProbes" flag.
void DTrace::disable_dprobes(int probes) {
bool changed = false;
if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
set_bool_flag("DTraceAllocProbes", false);
changed = true;
}
if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
set_bool_flag("DTraceMethodProbes", false);
changed = true;
}
if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
set_bool_flag("DTraceMonitorProbes", false);
changed = true;
}
if (changed) {
// one or more flags changed, need to deoptimize
VM_DeoptimizeTheWorld op;
VMThread::execute(&op);
}
}
// Do clean-up on "all door clients detached" event.
void DTrace::detach_all_clients() {
/*
* We restore the state of the fine grained flags
* to be consistent with overall ExtendedDTraceProbes.
* This way, we will honour command line setting or the
* last explicit modification of ExtendedDTraceProbes by
* a call to set_extended_dprobes.
*/
if (ExtendedDTraceProbes) {
enable_dprobes(DTRACE_ALL_PROBES);
} else {
disable_dprobes(DTRACE_ALL_PROBES);
}
}
void DTrace::set_extended_dprobes(bool flag) {
// explicit setting of ExtendedDTraceProbes flag
set_bool_flag("ExtendedDTraceProbes", flag);
// make sure that the fine grained flags reflect the change.
if (flag) {
enable_dprobes(DTRACE_ALL_PROBES);
} else {
/*
* FIXME: Revisit this: currently all-client-detach detection
* does not work and hence disabled. The following scheme does
* not work. So, we have to disable fine-grained flags here.
*
* disable_dprobes call has to be delayed till next "detach all "event.
* This is to be done so that concurrent DTrace clients that may
* have enabled one or more fine grained dprobes and may be running
* still. On "detach all" clients event, we would sync ExtendedDTraceProbes
* with fine grained flags which would take care of disabling fine grained flags.
*/
disable_dprobes(DTRACE_ALL_PROBES);
}
}
#endif /* SOLARIS */
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