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src/share/vm/services/dtraceAttacher.cpp@710a3c8b516e (annotated)

src/share/vm/services/dtraceAttacher.cpp

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 6198

55fb97c4c58d

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2006, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "code/codeCache.hpp"
aoqi@0	27	#include "memory/resourceArea.hpp"
aoqi@0	28	#include "runtime/deoptimization.hpp"
aoqi@0	29	#include "runtime/vmThread.hpp"
aoqi@0	30	#include "runtime/vm_operations.hpp"
aoqi@0	31	#include "services/dtraceAttacher.hpp"
aoqi@0	32
aoqi@0	33	#ifdef SOLARIS
aoqi@0	34
aoqi@0	35	class VM_DeoptimizeTheWorld : public VM_Operation {
aoqi@0	36	public:
aoqi@0	37	VMOp_Type type() const {
aoqi@0	38	return VMOp_DeoptimizeTheWorld;
aoqi@0	39	}
aoqi@0	40	void doit() {
aoqi@0	41	CodeCache::mark_all_nmethods_for_deoptimization();
aoqi@0	42	ResourceMark rm;
aoqi@0	43	DeoptimizationMarker dm;
aoqi@0	44	// Deoptimize all activations depending on marked methods
aoqi@0	45	Deoptimization::deoptimize_dependents();
aoqi@0	46
aoqi@0	47	// Mark the dependent methods non entrant
aoqi@0	48	CodeCache::make_marked_nmethods_not_entrant();
aoqi@0	49	}
aoqi@0	50	};
aoqi@0	51
aoqi@0	52	static void set_bool_flag(const char* flag, bool value) {
aoqi@0	53	CommandLineFlags::boolAtPut((char*)flag, strlen(flag), &value,
aoqi@0	54	Flag::ATTACH_ON_DEMAND);
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	// Enable only the "fine grained" flags. Do *not* touch
aoqi@0	58	// the overall "ExtendedDTraceProbes" flag.
aoqi@0	59	void DTrace::enable_dprobes(int probes) {
aoqi@0	60	bool changed = false;
aoqi@0	61	if (!DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
aoqi@0	62	set_bool_flag("DTraceAllocProbes", true);
aoqi@0	63	changed = true;
aoqi@0	64	}
aoqi@0	65	if (!DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
aoqi@0	66	set_bool_flag("DTraceMethodProbes", true);
aoqi@0	67	changed = true;
aoqi@0	68	}
aoqi@0	69	if (!DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
aoqi@0	70	set_bool_flag("DTraceMonitorProbes", true);
aoqi@0	71	changed = true;
aoqi@0	72	}
aoqi@0	73
aoqi@0	74	if (changed) {
aoqi@0	75	// one or more flags changed, need to deoptimize
aoqi@0	76	VM_DeoptimizeTheWorld op;
aoqi@0	77	VMThread::execute(&op);
aoqi@0	78	}
aoqi@0	79	}
aoqi@0	80
aoqi@0	81	// Disable only the "fine grained" flags. Do *not* touch
aoqi@0	82	// the overall "ExtendedDTraceProbes" flag.
aoqi@0	83	void DTrace::disable_dprobes(int probes) {
aoqi@0	84	bool changed = false;
aoqi@0	85	if (DTraceAllocProbes && (probes & DTRACE_ALLOC_PROBES)) {
aoqi@0	86	set_bool_flag("DTraceAllocProbes", false);
aoqi@0	87	changed = true;
aoqi@0	88	}
aoqi@0	89	if (DTraceMethodProbes && (probes & DTRACE_METHOD_PROBES)) {
aoqi@0	90	set_bool_flag("DTraceMethodProbes", false);
aoqi@0	91	changed = true;
aoqi@0	92	}
aoqi@0	93	if (DTraceMonitorProbes && (probes & DTRACE_MONITOR_PROBES)) {
aoqi@0	94	set_bool_flag("DTraceMonitorProbes", false);
aoqi@0	95	changed = true;
aoqi@0	96	}
aoqi@0	97	if (changed) {
aoqi@0	98	// one or more flags changed, need to deoptimize
aoqi@0	99	VM_DeoptimizeTheWorld op;
aoqi@0	100	VMThread::execute(&op);
aoqi@0	101	}
aoqi@0	102	}
aoqi@0	103
aoqi@0	104	// Do clean-up on "all door clients detached" event.
aoqi@0	105	void DTrace::detach_all_clients() {
aoqi@0	106	/*
aoqi@0	107	* We restore the state of the fine grained flags
aoqi@0	108	* to be consistent with overall ExtendedDTraceProbes.
aoqi@0	109	* This way, we will honour command line setting or the
aoqi@0	110	* last explicit modification of ExtendedDTraceProbes by
aoqi@0	111	* a call to set_extended_dprobes.
aoqi@0	112	*/
aoqi@0	113	if (ExtendedDTraceProbes) {
aoqi@0	114	enable_dprobes(DTRACE_ALL_PROBES);
aoqi@0	115	} else {
aoqi@0	116	disable_dprobes(DTRACE_ALL_PROBES);
aoqi@0	117	}
aoqi@0	118	}
aoqi@0	119
aoqi@0	120	void DTrace::set_extended_dprobes(bool flag) {
aoqi@0	121	// explicit setting of ExtendedDTraceProbes flag
aoqi@0	122	set_bool_flag("ExtendedDTraceProbes", flag);
aoqi@0	123
aoqi@0	124	// make sure that the fine grained flags reflect the change.
aoqi@0	125	if (flag) {
aoqi@0	126	enable_dprobes(DTRACE_ALL_PROBES);
aoqi@0	127	} else {
aoqi@0	128	/*
aoqi@0	129	* FIXME: Revisit this: currently all-client-detach detection
aoqi@0	130	* does not work and hence disabled. The following scheme does
aoqi@0	131	* not work. So, we have to disable fine-grained flags here.
aoqi@0	132	*
aoqi@0	133	* disable_dprobes call has to be delayed till next "detach all "event.
aoqi@0	134	* This is to be done so that concurrent DTrace clients that may
aoqi@0	135	* have enabled one or more fine grained dprobes and may be running
aoqi@0	136	* still. On "detach all" clients event, we would sync ExtendedDTraceProbes
aoqi@0	137	* with fine grained flags which would take care of disabling fine grained flags.
aoqi@0	138	*/
aoqi@0	139	disable_dprobes(DTRACE_ALL_PROBES);
aoqi@0	140	}
aoqi@0	141	}
aoqi@0	142
aoqi@0	143	void DTrace::set_monitor_dprobes(bool flag) {
aoqi@0	144	// explicit setting of DTraceMonitorProbes flag
aoqi@0	145	set_bool_flag("DTraceMonitorProbes", flag);
aoqi@0	146	}
aoqi@0	147
aoqi@0	148	#endif /* SOLARIS */