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src/share/vm/interpreter/invocationCounter.cpp@2c6ef90f030a (annotated)

src/share/vm/interpreter/invocationCounter.cpp

Mon, 07 Jul 2014 10:12:40 +0200

author

stefank

date

Mon, 07 Jul 2014 10:12:40 +0200

changeset 6992

2c6ef90f030a

parent 4936

aeaca88565e6

child 6876

710a3c8b516e

permissions

-rw-r--r--

8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com

duke@435	1	/*
jiangli@4936	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "interpreter/invocationCounter.hpp"
stefank@2314	27	#include "runtime/frame.hpp"
stefank@2314	28	#include "runtime/handles.inline.hpp"
duke@435	29
duke@435	30
duke@435	31	// Implementation of InvocationCounter
duke@435	32
duke@435	33	void InvocationCounter::init() {
duke@435	34	_counter = 0; // reset all the bits, including the sticky carry
duke@435	35	reset();
duke@435	36	}
duke@435	37
duke@435	38	void InvocationCounter::reset() {
duke@435	39	// Only reset the state and don't make the method look like it's never
duke@435	40	// been executed
duke@435	41	set_state(wait_for_compile);
duke@435	42	}
duke@435	43
duke@435	44	void InvocationCounter::set_carry() {
iveresov@2138	45	set_carry_flag();
duke@435	46	// The carry bit now indicates that this counter had achieved a very
duke@435	47	// large value. Now reduce the value, so that the method can be
duke@435	48	// executed many more times before re-entering the VM.
duke@435	49	int old_count = count();
duke@435	50	int new_count = MIN2(old_count, (int) (CompileThreshold / 2));
coleenp@1089	51	// prevent from going to zero, to distinguish from never-executed methods
coleenp@1089	52	if (new_count == 0) new_count = 1;
duke@435	53	if (old_count != new_count) set(state(), new_count);
duke@435	54	}
duke@435	55
duke@435	56	void InvocationCounter::set_state(State state) {
duke@435	57	assert(0 <= state && state < number_of_states, "illegal state");
duke@435	58	int init = _init[state];
duke@435	59	// prevent from going to zero, to distinguish from never-executed methods
duke@435	60	if (init == 0 && count() > 0) init = 1;
duke@435	61	int carry = (_counter & carry_mask); // the carry bit is sticky
duke@435	62	_counter = (init << number_of_noncount_bits) | carry | state;
duke@435	63	}
duke@435	64
duke@435	65
duke@435	66	void InvocationCounter::print() {
duke@435	67	tty->print_cr("invocation count: up = %d, limit = %d, carry = %s, state = %s",
duke@435	68	count(), limit(),
duke@435	69	carry() ? "true" : "false",
duke@435	70	state_as_string(state()));
duke@435	71	}
duke@435	72
duke@435	73	void InvocationCounter::print_short() {
duke@435	74	tty->print(" [%d%s;%s]", count(), carry()?"+carry":"", state_as_short_string(state()));
duke@435	75	}
duke@435	76
duke@435	77	// Initialization
duke@435	78
duke@435	79	int InvocationCounter::_init [InvocationCounter::number_of_states];
duke@435	80	InvocationCounter::Action InvocationCounter::_action[InvocationCounter::number_of_states];
duke@435	81	int InvocationCounter::InterpreterInvocationLimit;
duke@435	82	int InvocationCounter::InterpreterBackwardBranchLimit;
duke@435	83	int InvocationCounter::InterpreterProfileLimit;
duke@435	84
duke@435	85
duke@435	86	const char* InvocationCounter::state_as_string(State state) {
duke@435	87	switch (state) {
duke@435	88	case wait_for_nothing : return "wait_for_nothing";
duke@435	89	case wait_for_compile : return "wait_for_compile";
duke@435	90	}
duke@435	91	ShouldNotReachHere();
duke@435	92	return NULL;
duke@435	93	}
duke@435	94
duke@435	95	const char* InvocationCounter::state_as_short_string(State state) {
duke@435	96	switch (state) {
duke@435	97	case wait_for_nothing : return "not comp.";
duke@435	98	case wait_for_compile : return "compileable";
duke@435	99	}
duke@435	100	ShouldNotReachHere();
duke@435	101	return NULL;
duke@435	102	}
duke@435	103
duke@435	104
duke@435	105	static address do_nothing(methodHandle method, TRAPS) {
duke@435	106	// dummy action for inactive invocation counters
jiangli@4936	107	MethodCounters* mcs = method->method_counters();
jiangli@4936	108	assert(mcs != NULL, "");
jiangli@4936	109	mcs->invocation_counter()->set_carry();
jiangli@4936	110	mcs->invocation_counter()->set_state(InvocationCounter::wait_for_nothing);
duke@435	111	return NULL;
duke@435	112	}
duke@435	113
duke@435	114
duke@435	115	static address do_decay(methodHandle method, TRAPS) {
duke@435	116	// decay invocation counters so compilation gets delayed
jiangli@4936	117	MethodCounters* mcs = method->method_counters();
jiangli@4936	118	assert(mcs != NULL, "");
jiangli@4936	119	mcs->invocation_counter()->decay();
duke@435	120	return NULL;
duke@435	121	}
duke@435	122
duke@435	123
duke@435	124	void InvocationCounter::def(State state, int init, Action action) {
duke@435	125	assert(0 <= state && state < number_of_states, "illegal state");
duke@435	126	assert(0 <= init && init < count_limit, "initial value out of range");
duke@435	127	_init [state] = init;
duke@435	128	_action[state] = action;
duke@435	129	}
duke@435	130
duke@435	131	address dummy_invocation_counter_overflow(methodHandle m, TRAPS) {
duke@435	132	ShouldNotReachHere();
duke@435	133	return NULL;
duke@435	134	}
duke@435	135
duke@435	136	void InvocationCounter::reinitialize(bool delay_overflow) {
duke@435	137	// define states
duke@435	138	guarantee((int)number_of_states <= (int)state_limit, "adjust number_of_state_bits");
duke@435	139	def(wait_for_nothing, 0, do_nothing);
duke@435	140	if (delay_overflow) {
duke@435	141	def(wait_for_compile, 0, do_decay);
duke@435	142	} else {
duke@435	143	def(wait_for_compile, 0, dummy_invocation_counter_overflow);
duke@435	144	}
duke@435	145
duke@435	146	InterpreterInvocationLimit = CompileThreshold << number_of_noncount_bits;
duke@435	147	InterpreterProfileLimit = ((CompileThreshold * InterpreterProfilePercentage) / 100)<< number_of_noncount_bits;
duke@435	148
duke@435	149	// When methodData is collected, the backward branch limit is compared against a
duke@435	150	// methodData counter, rather than an InvocationCounter. In the former case, we
duke@435	151	// don't need the shift by number_of_noncount_bits, but we do need to adjust
duke@435	152	// the factor by which we scale the threshold.
duke@435	153	if (ProfileInterpreter) {
duke@435	154	InterpreterBackwardBranchLimit = (CompileThreshold * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100;
duke@435	155	} else {
duke@435	156	InterpreterBackwardBranchLimit = ((CompileThreshold * OnStackReplacePercentage) / 100) << number_of_noncount_bits;
duke@435	157	}
duke@435	158
duke@435	159	assert(0 <= InterpreterBackwardBranchLimit,
duke@435	160	"OSR threshold should be non-negative");
duke@435	161	assert(0 <= InterpreterProfileLimit &&
duke@435	162	InterpreterProfileLimit <= InterpreterInvocationLimit,
duke@435	163	"profile threshold should be less than the compilation threshold "
duke@435	164	"and non-negative");
duke@435	165	}
duke@435	166
duke@435	167	void invocationCounter_init() {
duke@435	168	InvocationCounter::reinitialize(DelayCompilationDuringStartup);
duke@435	169	}