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src/share/vm/memory/threadLocalAllocBuffer.cpp@427b2fb1944f (annotated)

src/share/vm/memory/threadLocalAllocBuffer.cpp

Wed, 31 Jan 2018 19:24:57 -0500

author

dbuck

date

Wed, 31 Jan 2018 19:24:57 -0500

changeset 9289

427b2fb1944f

parent 7470

060cdf93040c

child 9448

73d689add964

child 9965

c39172598323

permissions

-rw-r--r--

8189170: Add option to disable stack overflow checking in primordial thread for use with JNI_CreateJavaJVM
Reviewed-by: dcubed

duke@435	1	/*
dbuck@9289	2	* Copyright (c) 1999, 2018, 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 "memory/genCollectedHeap.hpp"
stefank@2314	27	#include "memory/resourceArea.hpp"
stefank@2314	28	#include "memory/threadLocalAllocBuffer.inline.hpp"
stefank@2314	29	#include "memory/universe.inline.hpp"
stefank@2314	30	#include "oops/oop.inline.hpp"
stefank@4299	31	#include "runtime/thread.inline.hpp"
stefank@2314	32	#include "utilities/copy.hpp"
stefank@2314	33
drchase@6680	34	PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
drchase@6680	35
duke@435	36	// Thread-Local Edens support
duke@435	37
duke@435	38	// static member initialization
brutisso@6376	39	size_t ThreadLocalAllocBuffer::_max_size = 0;
duke@435	40	unsigned ThreadLocalAllocBuffer::_target_refills = 0;
duke@435	41	GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL;
duke@435	42
duke@435	43	void ThreadLocalAllocBuffer::clear_before_allocation() {
duke@435	44	_slow_refill_waste += (unsigned)remaining();
duke@435	45	make_parsable(true); // also retire the TLAB
duke@435	46	}
duke@435	47
duke@435	48	void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
duke@435	49	global_stats()->initialize();
duke@435	50
brutisso@6376	51	for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
duke@435	52	thread->tlab().accumulate_statistics();
duke@435	53	thread->tlab().initialize_statistics();
duke@435	54	}
duke@435	55
duke@435	56	// Publish new stats if some allocation occurred.
duke@435	57	if (global_stats()->allocation() != 0) {
duke@435	58	global_stats()->publish();
duke@435	59	if (PrintTLAB) {
duke@435	60	global_stats()->print();
duke@435	61	}
duke@435	62	}
duke@435	63	}
duke@435	64
duke@435	65	void ThreadLocalAllocBuffer::accumulate_statistics() {
brutisso@6376	66	Thread* thread = myThread();
brutisso@6376	67	size_t capacity = Universe::heap()->tlab_capacity(thread);
brutisso@6376	68	size_t used = Universe::heap()->tlab_used(thread);
duke@435	69
duke@435	70	_gc_waste += (unsigned)remaining();
brutisso@6376	71	size_t total_allocated = thread->allocated_bytes();
brutisso@6376	72	size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc;
brutisso@6376	73	_allocated_before_last_gc = total_allocated;
duke@435	74
duke@435	75	if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {
duke@435	76	print_stats("gc");
duke@435	77	}
duke@435	78
duke@435	79	if (_number_of_refills > 0) {
brutisso@6376	80	// Update allocation history if a reasonable amount of eden was allocated.
brutisso@6376	81	bool update_allocation_history = used > 0.5 * capacity;
duke@435	82
duke@435	83	if (update_allocation_history) {
duke@435	84	// Average the fraction of eden allocated in a tlab by this
duke@435	85	// thread for use in the next resize operation.
duke@435	86	// _gc_waste is not subtracted because it's included in
duke@435	87	// "used".
brutisso@6376	88	// The result can be larger than 1.0 due to direct to old allocations.
brutisso@6376	89	// These allocations should ideally not be counted but since it is not possible
brutisso@6376	90	// to filter them out here we just cap the fraction to be at most 1.0.
brutisso@6376	91	double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used);
duke@435	92	_allocation_fraction.sample(alloc_frac);
duke@435	93	}
duke@435	94	global_stats()->update_allocating_threads();
duke@435	95	global_stats()->update_number_of_refills(_number_of_refills);
duke@435	96	global_stats()->update_allocation(_number_of_refills * desired_size());
duke@435	97	global_stats()->update_gc_waste(_gc_waste);
duke@435	98	global_stats()->update_slow_refill_waste(_slow_refill_waste);
duke@435	99	global_stats()->update_fast_refill_waste(_fast_refill_waste);
duke@435	100
duke@435	101	} else {
duke@435	102	assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
duke@435	103	_slow_refill_waste == 0 && _gc_waste == 0,
duke@435	104	"tlab stats == 0");
duke@435	105	}
duke@435	106	global_stats()->update_slow_allocations(_slow_allocations);
duke@435	107	}
duke@435	108
duke@435	109	// Fills the current tlab with a dummy filler array to create
duke@435	110	// an illusion of a contiguous Eden and optionally retires the tlab.
duke@435	111	// Waste accounting should be done in caller as appropriate; see,
duke@435	112	// for example, clear_before_allocation().
duke@435	113	void ThreadLocalAllocBuffer::make_parsable(bool retire) {
duke@435	114	if (end() != NULL) {
duke@435	115	invariants();
phh@2423	116
phh@2423	117	if (retire) {
phh@2423	118	myThread()->incr_allocated_bytes(used_bytes());
phh@2423	119	}
phh@2423	120
johnc@1600	121	CollectedHeap::fill_with_object(top(), hard_end(), retire);
duke@435	122
duke@435	123	if (retire || ZeroTLAB) { // "Reset" the TLAB
duke@435	124	set_start(NULL);
duke@435	125	set_top(NULL);
duke@435	126	set_pf_top(NULL);
duke@435	127	set_end(NULL);
duke@435	128	}
duke@435	129	}
duke@435	130	assert(!(retire || ZeroTLAB) ||
duke@435	131	(start() == NULL && end() == NULL && top() == NULL),
duke@435	132	"TLAB must be reset");
duke@435	133	}
duke@435	134
duke@435	135	void ThreadLocalAllocBuffer::resize_all_tlabs() {
brutisso@6376	136	if (ResizeTLAB) {
brutisso@6376	137	for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
brutisso@6376	138	thread->tlab().resize();
brutisso@6376	139	}
duke@435	140	}
duke@435	141	}
duke@435	142
duke@435	143	void ThreadLocalAllocBuffer::resize() {
brutisso@6376	144	// Compute the next tlab size using expected allocation amount
brutisso@6376	145	assert(ResizeTLAB, "Should not call this otherwise");
brutisso@6376	146	size_t alloc = (size_t)(_allocation_fraction.average() *
brutisso@6376	147	(Universe::heap()->tlab_capacity(myThread()) / HeapWordSize));
brutisso@6376	148	size_t new_size = alloc / _target_refills;
duke@435	149
brutisso@6376	150	new_size = MIN2(MAX2(new_size, min_size()), max_size());
duke@435	151
brutisso@6376	152	size_t aligned_new_size = align_object_size(new_size);
duke@435	153
brutisso@6376	154	if (PrintTLAB && Verbose) {
brutisso@6376	155	gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]"
brutisso@6376	156	" refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n",
brutisso@6376	157	myThread(), myThread()->osthread()->thread_id(),
brutisso@6376	158	_target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size);
duke@435	159	}
brutisso@6376	160	set_desired_size(aligned_new_size);
brutisso@6376	161	set_refill_waste_limit(initial_refill_waste_limit());
duke@435	162	}
duke@435	163
duke@435	164	void ThreadLocalAllocBuffer::initialize_statistics() {
duke@435	165	_number_of_refills = 0;
duke@435	166	_fast_refill_waste = 0;
duke@435	167	_slow_refill_waste = 0;
duke@435	168	_gc_waste = 0;
duke@435	169	_slow_allocations = 0;
duke@435	170	}
duke@435	171
duke@435	172	void ThreadLocalAllocBuffer::fill(HeapWord* start,
duke@435	173	HeapWord* top,
duke@435	174	size_t new_size) {
duke@435	175	_number_of_refills++;
duke@435	176	if (PrintTLAB && Verbose) {
duke@435	177	print_stats("fill");
duke@435	178	}
duke@435	179	assert(top <= start + new_size - alignment_reserve(), "size too small");
duke@435	180	initialize(start, top, start + new_size - alignment_reserve());
duke@435	181
duke@435	182	// Reset amount of internal fragmentation
duke@435	183	set_refill_waste_limit(initial_refill_waste_limit());
duke@435	184	}
duke@435	185
duke@435	186	void ThreadLocalAllocBuffer::initialize(HeapWord* start,
duke@435	187	HeapWord* top,
duke@435	188	HeapWord* end) {
duke@435	189	set_start(start);
duke@435	190	set_top(top);
duke@435	191	set_pf_top(top);
duke@435	192	set_end(end);
duke@435	193	invariants();
duke@435	194	}
duke@435	195
duke@435	196	void ThreadLocalAllocBuffer::initialize() {
duke@435	197	initialize(NULL, // start
duke@435	198	NULL, // top
duke@435	199	NULL); // end
duke@435	200
duke@435	201	set_desired_size(initial_desired_size());
duke@435	202
dbuck@9289	203	// Following check is needed because at startup the main
duke@435	204	// thread is initialized before the heap is. The initialization for
duke@435	205	// this thread is redone in startup_initialization below.
duke@435	206	if (Universe::heap() != NULL) {
duke@435	207	size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
duke@435	208	double alloc_frac = desired_size() * target_refills() / (double) capacity;
duke@435	209	_allocation_fraction.sample(alloc_frac);
duke@435	210	}
duke@435	211
duke@435	212	set_refill_waste_limit(initial_refill_waste_limit());
duke@435	213
duke@435	214	initialize_statistics();
duke@435	215	}
duke@435	216
duke@435	217	void ThreadLocalAllocBuffer::startup_initialization() {
duke@435	218
duke@435	219	// Assuming each thread's active tlab is, on average,
duke@435	220	// 1/2 full at a GC
duke@435	221	_target_refills = 100 / (2 * TLABWasteTargetPercent);
duke@435	222	_target_refills = MAX2(_target_refills, (unsigned)1U);
duke@435	223
duke@435	224	_global_stats = new GlobalTLABStats();
duke@435	225
dbuck@9289	226	// During jvm startup, the main thread is initialized
duke@435	227	// before the heap is initialized. So reinitialize it now.
duke@435	228	guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
duke@435	229	Thread::current()->tlab().initialize();
duke@435	230
duke@435	231	if (PrintTLAB && Verbose) {
duke@435	232	gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
duke@435	233	min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
duke@435	234	}
duke@435	235	}
duke@435	236
duke@435	237	size_t ThreadLocalAllocBuffer::initial_desired_size() {
mgerdin@7470	238	size_t init_sz = 0;
duke@435	239
duke@435	240	if (TLABSize > 0) {
mgerdin@7470	241	init_sz = TLABSize / HeapWordSize;
mgerdin@7470	242	} else if (global_stats() != NULL) {
duke@435	243	// Initial size is a function of the average number of allocating threads.
duke@435	244	unsigned nof_threads = global_stats()->allocating_threads_avg();
duke@435	245
duke@435	246	init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
duke@435	247	(nof_threads * target_refills());
duke@435	248	init_sz = align_object_size(init_sz);
duke@435	249	}
mgerdin@7470	250	init_sz = MIN2(MAX2(init_sz, min_size()), max_size());
duke@435	251	return init_sz;
duke@435	252	}
duke@435	253
duke@435	254	void ThreadLocalAllocBuffer::print_stats(const char* tag) {
duke@435	255	Thread* thrd = myThread();
duke@435	256	size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste;
duke@435	257	size_t alloc = _number_of_refills * _desired_size;
duke@435	258	double waste_percent = alloc == 0 ? 0.0 :
duke@435	259	100.0 * waste / alloc;
brutisso@6376	260	size_t tlab_used = Universe::heap()->tlab_used(thrd);
duke@435	261	gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"
duke@435	262	" desired_size: " SIZE_FORMAT "KB"
duke@435	263	" slow allocs: %d refill waste: " SIZE_FORMAT "B"
duke@435	264	" alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB"
duke@435	265	" slow: %dB fast: %dB\n",
duke@435	266	tag, thrd, thrd->osthread()->thread_id(),
duke@435	267	_desired_size / (K / HeapWordSize),
duke@435	268	_slow_allocations, _refill_waste_limit * HeapWordSize,
duke@435	269	_allocation_fraction.average(),
duke@435	270	_allocation_fraction.average() * tlab_used / K,
duke@435	271	_number_of_refills, waste_percent,
duke@435	272	_gc_waste * HeapWordSize,
duke@435	273	_slow_refill_waste * HeapWordSize,
duke@435	274	_fast_refill_waste * HeapWordSize);
duke@435	275	}
duke@435	276
duke@435	277	void ThreadLocalAllocBuffer::verify() {
duke@435	278	HeapWord* p = start();
duke@435	279	HeapWord* t = top();
duke@435	280	HeapWord* prev_p = NULL;
duke@435	281	while (p < t) {
duke@435	282	oop(p)->verify();
duke@435	283	prev_p = p;
duke@435	284	p += oop(p)->size();
duke@435	285	}
duke@435	286	guarantee(p == top(), "end of last object must match end of space");
duke@435	287	}
duke@435	288
duke@435	289	Thread* ThreadLocalAllocBuffer::myThread() {
duke@435	290	return (Thread*)(((char *)this) +
duke@435	291	in_bytes(start_offset()) -
duke@435	292	in_bytes(Thread::tlab_start_offset()));
duke@435	293	}
duke@435	294
duke@435	295
duke@435	296	GlobalTLABStats::GlobalTLABStats() :
duke@435	297	_allocating_threads_avg(TLABAllocationWeight) {
duke@435	298
duke@435	299	initialize();
duke@435	300
duke@435	301	_allocating_threads_avg.sample(1); // One allocating thread at startup
duke@435	302
duke@435	303	if (UsePerfData) {
duke@435	304
duke@435	305	EXCEPTION_MARK;
duke@435	306	ResourceMark rm;
duke@435	307
duke@435	308	char* cname = PerfDataManager::counter_name("tlab", "allocThreads");
duke@435	309	_perf_allocating_threads =
duke@435	310	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
duke@435	311
duke@435	312	cname = PerfDataManager::counter_name("tlab", "fills");
duke@435	313	_perf_total_refills =
duke@435	314	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
duke@435	315
duke@435	316	cname = PerfDataManager::counter_name("tlab", "maxFills");
duke@435	317	_perf_max_refills =
duke@435	318	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
duke@435	319
duke@435	320	cname = PerfDataManager::counter_name("tlab", "alloc");
duke@435	321	_perf_allocation =
duke@435	322	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	323
duke@435	324	cname = PerfDataManager::counter_name("tlab", "gcWaste");
duke@435	325	_perf_gc_waste =
duke@435	326	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	327
duke@435	328	cname = PerfDataManager::counter_name("tlab", "maxGcWaste");
duke@435	329	_perf_max_gc_waste =
duke@435	330	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	331
duke@435	332	cname = PerfDataManager::counter_name("tlab", "slowWaste");
duke@435	333	_perf_slow_refill_waste =
duke@435	334	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	335
duke@435	336	cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");
duke@435	337	_perf_max_slow_refill_waste =
duke@435	338	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	339
duke@435	340	cname = PerfDataManager::counter_name("tlab", "fastWaste");
duke@435	341	_perf_fast_refill_waste =
duke@435	342	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	343
duke@435	344	cname = PerfDataManager::counter_name("tlab", "maxFastWaste");
duke@435	345	_perf_max_fast_refill_waste =
duke@435	346	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
duke@435	347
duke@435	348	cname = PerfDataManager::counter_name("tlab", "slowAlloc");
duke@435	349	_perf_slow_allocations =
duke@435	350	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
duke@435	351
duke@435	352	cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");
duke@435	353	_perf_max_slow_allocations =
duke@435	354	PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
duke@435	355	}
duke@435	356	}
duke@435	357
duke@435	358	void GlobalTLABStats::initialize() {
duke@435	359	// Clear counters summarizing info from all threads
duke@435	360	_allocating_threads = 0;
duke@435	361	_total_refills = 0;
duke@435	362	_max_refills = 0;
duke@435	363	_total_allocation = 0;
duke@435	364	_total_gc_waste = 0;
duke@435	365	_max_gc_waste = 0;
duke@435	366	_total_slow_refill_waste = 0;
duke@435	367	_max_slow_refill_waste = 0;
duke@435	368	_total_fast_refill_waste = 0;
duke@435	369	_max_fast_refill_waste = 0;
duke@435	370	_total_slow_allocations = 0;
duke@435	371	_max_slow_allocations = 0;
duke@435	372	}
duke@435	373
duke@435	374	void GlobalTLABStats::publish() {
duke@435	375	_allocating_threads_avg.sample(_allocating_threads);
duke@435	376	if (UsePerfData) {
duke@435	377	_perf_allocating_threads ->set_value(_allocating_threads);
duke@435	378	_perf_total_refills ->set_value(_total_refills);
duke@435	379	_perf_max_refills ->set_value(_max_refills);
duke@435	380	_perf_allocation ->set_value(_total_allocation);
duke@435	381	_perf_gc_waste ->set_value(_total_gc_waste);
duke@435	382	_perf_max_gc_waste ->set_value(_max_gc_waste);
duke@435	383	_perf_slow_refill_waste ->set_value(_total_slow_refill_waste);
duke@435	384	_perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);
duke@435	385	_perf_fast_refill_waste ->set_value(_total_fast_refill_waste);
duke@435	386	_perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);
duke@435	387	_perf_slow_allocations ->set_value(_total_slow_allocations);
duke@435	388	_perf_max_slow_allocations ->set_value(_max_slow_allocations);
duke@435	389	}
duke@435	390	}
duke@435	391
duke@435	392	void GlobalTLABStats::print() {
duke@435	393	size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
duke@435	394	double waste_percent = _total_allocation == 0 ? 0.0 :
duke@435	395	100.0 * waste / _total_allocation;
duke@435	396	gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d"
duke@435	397	" slow allocs: %d max %d waste: %4.1f%%"
duke@435	398	" gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
duke@435	399	" slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
duke@435	400	" fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n",
duke@435	401	_allocating_threads,
duke@435	402	_total_refills, _max_refills,
duke@435	403	_total_slow_allocations, _max_slow_allocations,
duke@435	404	waste_percent,
duke@435	405	_total_gc_waste * HeapWordSize,
duke@435	406	_max_gc_waste * HeapWordSize,
duke@435	407	_total_slow_refill_waste * HeapWordSize,
duke@435	408	_max_slow_refill_waste * HeapWordSize,
duke@435	409	_total_fast_refill_waste * HeapWordSize,
duke@435	410	_max_fast_refill_waste * HeapWordSize);
duke@435	411	}