truffle: src/share/vm/gc_interface/collectedHeap.cpp annotate

annotate src/share/vm/gc_interface/collectedHeap.cpp @ 3960:f08d439fab8c

7089790: integrate bsd-port changes Reviewed-by: kvn, twisti, jrose Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>

author	never
date	Sun, 25 Sep 2011 16:03:29 -0700
parents	d968f546734e
children	e5928e7dab26

rev	line source
0 a61af66fc99e Initial load duke parents: diff changeset	1 /*
2426 1d1603768966 7010070: Update all 2010 Oracle-changed OpenJDK files to have the proper copyright dates - second pass trims parents: 2226 diff changeset	2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
0 a61af66fc99e Initial load duke parents: diff changeset	3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load duke parents: diff changeset	4 *
a61af66fc99e Initial load duke parents: diff changeset	5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load duke parents: diff changeset	6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load duke parents: diff changeset	7 * published by the Free Software Foundation.
a61af66fc99e Initial load duke parents: diff changeset	8 *
a61af66fc99e Initial load duke parents: diff changeset	9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load duke parents: diff changeset	10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load duke parents: diff changeset	11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load duke parents: diff changeset	12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load duke parents: diff changeset	13 * accompanied this code).
a61af66fc99e Initial load duke parents: diff changeset	14 *
a61af66fc99e Initial load duke parents: diff changeset	15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load duke parents: diff changeset	16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load duke parents: diff changeset	17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load duke parents: diff changeset	18 *
1552 c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1549 diff changeset	19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1549 diff changeset	20 * or visit www.oracle.com if you need additional information or have any
c18cbe5936b8 6941466: Oracle rebranding changes for Hotspot repositories trims parents: 1549 diff changeset	21 * questions.
0 a61af66fc99e Initial load duke parents: diff changeset	22 *
a61af66fc99e Initial load duke parents: diff changeset	23 */
a61af66fc99e Initial load duke parents: diff changeset	24
1972 f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	25 #include "precompiled.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	26 #include "classfile/systemDictionary.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	27 #include "gc_implementation/shared/vmGCOperations.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	28 #include "gc_interface/collectedHeap.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	29 #include "gc_interface/collectedHeap.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	30 #include "oops/oop.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	31 #include "runtime/init.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	32 #include "services/heapDumper.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	33 #ifdef TARGET_OS_FAMILY_linux
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	34 # include "thread_linux.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	35 #endif
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	36 #ifdef TARGET_OS_FAMILY_solaris
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	37 # include "thread_solaris.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	38 #endif
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	39 #ifdef TARGET_OS_FAMILY_windows
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	40 # include "thread_windows.inline.hpp"
f95d63e2154a 6989984: Use standard include model for Hospot stefank parents: 1833 diff changeset	41 #endif
3960 f08d439fab8c 7089790: integrate bsd-port changes never parents: 3910 diff changeset	42 #ifdef TARGET_OS_FAMILY_bsd
f08d439fab8c 7089790: integrate bsd-port changes never parents: 3910 diff changeset	43 # include "thread_bsd.inline.hpp"
f08d439fab8c 7089790: integrate bsd-port changes never parents: 3910 diff changeset	44 #endif
0 a61af66fc99e Initial load duke parents: diff changeset	45
a61af66fc99e Initial load duke parents: diff changeset	46
a61af66fc99e Initial load duke parents: diff changeset	47 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	48 int CollectedHeap::_fire_out_of_memory_count = 0;
a61af66fc99e Initial load duke parents: diff changeset	49 #endif
a61af66fc99e Initial load duke parents: diff changeset	50
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	51 size_t CollectedHeap::_filler_array_max_size = 0;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	52
0 a61af66fc99e Initial load duke parents: diff changeset	53 // Memory state functions.
a61af66fc99e Initial load duke parents: diff changeset	54
1833 8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1579 diff changeset	55
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1579 diff changeset	56 CollectedHeap::CollectedHeap() : _n_par_threads(0)
8b10f48633dc 6984287: Regularize how GC parallel workers are specified. jmasa parents: 1579 diff changeset	57
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	58 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	59 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT));
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	60 const size_t elements_per_word = HeapWordSize / sizeof(jint);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	61 _filler_array_max_size = align_object_size(filler_array_hdr_size() +
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	62 max_len * elements_per_word);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	63
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	64 _barrier_set = NULL;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	65 _is_gc_active = false;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	66 _total_collections = _total_full_collections = 0;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	67 _gc_cause = _gc_lastcause = GCCause::_no_gc;
0 a61af66fc99e Initial load duke parents: diff changeset	68 NOT_PRODUCT(_promotion_failure_alot_count = 0;)
a61af66fc99e Initial load duke parents: diff changeset	69 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;)
a61af66fc99e Initial load duke parents: diff changeset	70
a61af66fc99e Initial load duke parents: diff changeset	71 if (UsePerfData) {
a61af66fc99e Initial load duke parents: diff changeset	72 EXCEPTION_MARK;
a61af66fc99e Initial load duke parents: diff changeset	73
a61af66fc99e Initial load duke parents: diff changeset	74 // create the gc cause jvmstat counters
a61af66fc99e Initial load duke parents: diff changeset	75 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause",
a61af66fc99e Initial load duke parents: diff changeset	76 80, GCCause::to_string(_gc_cause), CHECK);
a61af66fc99e Initial load duke parents: diff changeset	77
a61af66fc99e Initial load duke parents: diff changeset	78 _perf_gc_lastcause =
a61af66fc99e Initial load duke parents: diff changeset	79 PerfDataManager::create_string_variable(SUN_GC, "lastCause",
a61af66fc99e Initial load duke parents: diff changeset	80 80, GCCause::to_string(_gc_lastcause), CHECK);
a61af66fc99e Initial load duke parents: diff changeset	81 }
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	82 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below.
0 a61af66fc99e Initial load duke parents: diff changeset	83 }
a61af66fc99e Initial load duke parents: diff changeset	84
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	85 void CollectedHeap::pre_initialize() {
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	86 // Used for ReduceInitialCardMarks (when COMPILER2 is used);
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	87 // otherwise remains unused.
1548 15190cbcabe9 6953483: Typo related to ReduceInitialCardMarks leaves concurrent collectors vulnerable to heap corruption ysr parents: 1194 diff changeset	88 #ifdef COMPILER2
1194 34fb2662f6c2 6920090: G1: Disable ReduceInitialCardMarks at least until 6920109 is fixed ysr parents: 1166 diff changeset	89 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers()
34fb2662f6c2 6920090: G1: Disable ReduceInitialCardMarks at least until 6920109 is fixed ysr parents: 1166 diff changeset	90 && (DeferInitialCardMark \|\| card_mark_must_follow_store());
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	91 #else
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	92 assert(_defer_initial_card_mark == false, "Who would set it?");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	93 #endif
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	94 }
0 a61af66fc99e Initial load duke parents: diff changeset	95
a61af66fc99e Initial load duke parents: diff changeset	96 #ifndef PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	97 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) {
a61af66fc99e Initial load duke parents: diff changeset	98 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
a61af66fc99e Initial load duke parents: diff changeset	99 for (size_t slot = 0; slot < size; slot += 1) {
a61af66fc99e Initial load duke parents: diff changeset	100 assert(((intptr_t) (addr + slot)) != ((intptr_t) badHeapWordVal),
a61af66fc99e Initial load duke parents: diff changeset	101 "Found badHeapWordValue in post-allocation check");
a61af66fc99e Initial load duke parents: diff changeset	102 }
a61af66fc99e Initial load duke parents: diff changeset	103 }
a61af66fc99e Initial load duke parents: diff changeset	104 }
a61af66fc99e Initial load duke parents: diff changeset	105
2226 c5a923563727 6912621: iCMS: Error: assert(_markBitMap.isMarked(addr + 1),"Missing Printezis bit?") ysr parents: 1972 diff changeset	106 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) {
0 a61af66fc99e Initial load duke parents: diff changeset	107 if (CheckMemoryInitialization && ZapUnusedHeapArea) {
a61af66fc99e Initial load duke parents: diff changeset	108 for (size_t slot = 0; slot < size; slot += 1) {
a61af66fc99e Initial load duke parents: diff changeset	109 assert(((intptr_t) (addr + slot)) == ((intptr_t) badHeapWordVal),
a61af66fc99e Initial load duke parents: diff changeset	110 "Found non badHeapWordValue in pre-allocation check");
a61af66fc99e Initial load duke parents: diff changeset	111 }
a61af66fc99e Initial load duke parents: diff changeset	112 }
a61af66fc99e Initial load duke parents: diff changeset	113 }
a61af66fc99e Initial load duke parents: diff changeset	114 #endif // PRODUCT
a61af66fc99e Initial load duke parents: diff changeset	115
a61af66fc99e Initial load duke parents: diff changeset	116 #ifdef ASSERT
a61af66fc99e Initial load duke parents: diff changeset	117 void CollectedHeap::check_for_valid_allocation_state() {
a61af66fc99e Initial load duke parents: diff changeset	118 Thread *thread = Thread::current();
a61af66fc99e Initial load duke parents: diff changeset	119 // How to choose between a pending exception and a potential
a61af66fc99e Initial load duke parents: diff changeset	120 // OutOfMemoryError? Don't allow pending exceptions.
a61af66fc99e Initial load duke parents: diff changeset	121 // This is a VM policy failure, so how do we exhaustively test it?
a61af66fc99e Initial load duke parents: diff changeset	122 assert(!thread->has_pending_exception(),
a61af66fc99e Initial load duke parents: diff changeset	123 "shouldn't be allocating with pending exception");
a61af66fc99e Initial load duke parents: diff changeset	124 if (StrictSafepointChecks) {
a61af66fc99e Initial load duke parents: diff changeset	125 assert(thread->allow_allocation(),
a61af66fc99e Initial load duke parents: diff changeset	126 "Allocation done by thread for which allocation is blocked "
a61af66fc99e Initial load duke parents: diff changeset	127 "by No_Allocation_Verifier!");
a61af66fc99e Initial load duke parents: diff changeset	128 // Allocation of an oop can always invoke a safepoint,
a61af66fc99e Initial load duke parents: diff changeset	129 // hence, the true argument
a61af66fc99e Initial load duke parents: diff changeset	130 thread->check_for_valid_safepoint_state(true);
a61af66fc99e Initial load duke parents: diff changeset	131 }
a61af66fc99e Initial load duke parents: diff changeset	132 }
a61af66fc99e Initial load duke parents: diff changeset	133 #endif
a61af66fc99e Initial load duke parents: diff changeset	134
a61af66fc99e Initial load duke parents: diff changeset	135 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) {
a61af66fc99e Initial load duke parents: diff changeset	136
a61af66fc99e Initial load duke parents: diff changeset	137 // Retain tlab and allocate object in shared space if
a61af66fc99e Initial load duke parents: diff changeset	138 // the amount free in the tlab is too large to discard.
a61af66fc99e Initial load duke parents: diff changeset	139 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) {
a61af66fc99e Initial load duke parents: diff changeset	140 thread->tlab().record_slow_allocation(size);
a61af66fc99e Initial load duke parents: diff changeset	141 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	142 }
a61af66fc99e Initial load duke parents: diff changeset	143
a61af66fc99e Initial load duke parents: diff changeset	144 // Discard tlab and allocate a new one.
a61af66fc99e Initial load duke parents: diff changeset	145 // To minimize fragmentation, the last TLAB may be smaller than the rest.
a61af66fc99e Initial load duke parents: diff changeset	146 size_t new_tlab_size = thread->tlab().compute_size(size);
a61af66fc99e Initial load duke parents: diff changeset	147
a61af66fc99e Initial load duke parents: diff changeset	148 thread->tlab().clear_before_allocation();
a61af66fc99e Initial load duke parents: diff changeset	149
a61af66fc99e Initial load duke parents: diff changeset	150 if (new_tlab_size == 0) {
a61af66fc99e Initial load duke parents: diff changeset	151 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	152 }
a61af66fc99e Initial load duke parents: diff changeset	153
a61af66fc99e Initial load duke parents: diff changeset	154 // Allocate a new TLAB...
a61af66fc99e Initial load duke parents: diff changeset	155 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size);
a61af66fc99e Initial load duke parents: diff changeset	156 if (obj == NULL) {
a61af66fc99e Initial load duke parents: diff changeset	157 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	158 }
a61af66fc99e Initial load duke parents: diff changeset	159 if (ZeroTLAB) {
a61af66fc99e Initial load duke parents: diff changeset	160 // ..and clear it.
a61af66fc99e Initial load duke parents: diff changeset	161 Copy::zero_to_words(obj, new_tlab_size);
a61af66fc99e Initial load duke parents: diff changeset	162 } else {
3892 baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	163 // ...and zap just allocated object.
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	164 #ifdef ASSERT
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	165 // Skip mangling the space corresponding to the object header to
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	166 // ensure that the returned space is not considered parsable by
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	167 // any concurrent GC thread.
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	168 size_t hdr_size = oopDesc::header_size();
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	169 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal);
baf763f388e6 7059037: Use BIS for zeroing on T4 kvn parents: 2426 diff changeset	170 #endif // ASSERT
0 a61af66fc99e Initial load duke parents: diff changeset	171 }
a61af66fc99e Initial load duke parents: diff changeset	172 thread->tlab().fill(obj, obj + size, new_tlab_size);
a61af66fc99e Initial load duke parents: diff changeset	173 return obj;
a61af66fc99e Initial load duke parents: diff changeset	174 }
a61af66fc99e Initial load duke parents: diff changeset	175
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	176 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) {
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	177 MemRegion deferred = thread->deferred_card_mark();
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	178 if (!deferred.is_empty()) {
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	179 assert(_defer_initial_card_mark, "Otherwise should be empty");
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	180 {
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	181 // Verify that the storage points to a parsable object in heap
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	182 DEBUG_ONLY(oop old_obj = oop(deferred.start());)
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	183 assert(is_in(old_obj), "Not in allocated heap");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	184 assert(!can_elide_initializing_store_barrier(old_obj),
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	185 "Else should have been filtered in new_store_pre_barrier()");
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	186 assert(!is_in_permanent(old_obj), "Sanity: not expected");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	187 assert(old_obj->is_oop(true), "Not an oop");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	188 assert(old_obj->is_parsable(), "Will not be concurrently parsable");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	189 assert(deferred.word_size() == (size_t)(old_obj->size()),
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	190 "Mismatch: multiple objects?");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	191 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	192 BarrierSet* bs = barrier_set();
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	193 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	194 bs->write_region(deferred);
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	195 // "Clear" the deferred_card_mark field
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	196 thread->set_deferred_card_mark(MemRegion());
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	197 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	198 assert(thread->deferred_card_mark().is_empty(), "invariant");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	199 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	200
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	201 // Helper for ReduceInitialCardMarks. For performance,
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	202 // compiled code may elide card-marks for initializing stores
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	203 // to a newly allocated object along the fast-path. We
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	204 // compensate for such elided card-marks as follows:
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	205 // (a) Generational, non-concurrent collectors, such as
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	206 // GenCollectedHeap(ParNew,DefNew,Tenured) and
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	207 // ParallelScavengeHeap(ParallelGC, ParallelOldGC)
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	208 // need the card-mark if and only if the region is
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	209 // in the old gen, and do not care if the card-mark
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	210 // succeeds or precedes the initializing stores themselves,
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	211 // so long as the card-mark is completed before the next
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	212 // scavenge. For all these cases, we can do a card mark
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	213 // at the point at which we do a slow path allocation
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	214 // in the old gen, i.e. in this call.
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	215 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	216 // in addition that the card-mark for an old gen allocated
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	217 // object strictly follow any associated initializing stores.
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	218 // In these cases, the memRegion remembered below is
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	219 // used to card-mark the entire region either just before the next
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	220 // slow-path allocation by this thread or just before the next scavenge or
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	221 // CMS-associated safepoint, whichever of these events happens first.
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	222 // (The implicit assumption is that the object has been fully
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	223 // initialized by this point, a fact that we assert when doing the
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	224 // card-mark.)
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	225 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	226 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	227 // is used to remember the pre-value of any store. Initializing
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	228 // stores will not need this barrier, so we need not worry about
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	229 // compensating for the missing pre-barrier here. Turning now
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	230 // to the post-barrier, we note that G1 needs a RS update barrier
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	231 // which simply enqueues a (sequence of) dirty cards which may
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	232 // optionally be refined by the concurrent update threads. Note
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	233 // that this barrier need only be applied to a non-young write,
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	234 // but, like in CMS, because of the presence of concurrent refinement
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	235 // (much like CMS' precleaning), must strictly follow the oop-store.
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	236 // Thus, using the same protocol for maintaining the intended
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	237 // invariants turns out, serendepitously, to be the same for both
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	238 // G1 and CMS.
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	239 //
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	240 // For any future collector, this code should be reexamined with
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	241 // that specific collector in mind, and the documentation above suitably
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	242 // extended and updated.
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	243 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) {
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	244 // If a previous card-mark was deferred, flush it now.
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	245 flush_deferred_store_barrier(thread);
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	246 if (can_elide_initializing_store_barrier(new_obj)) {
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	247 // The deferred_card_mark region should be empty
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	248 // following the flush above.
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	249 assert(thread->deferred_card_mark().is_empty(), "Error");
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	250 } else {
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	251 MemRegion mr((HeapWord*)new_obj, new_obj->size());
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	252 assert(!mr.is_empty(), "Error");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	253 if (_defer_initial_card_mark) {
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	254 // Defer the card mark
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	255 thread->set_deferred_card_mark(mr);
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	256 } else {
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	257 // Do the card mark
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	258 BarrierSet* bs = barrier_set();
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	259 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	260 bs->write_region(mr);
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	261 }
1027 39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	262 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	263 return new_obj;
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	264 }
39b01ab7035a 6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning ysr parents: 628 diff changeset	265
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	266 size_t CollectedHeap::filler_array_hdr_size() {
1571 2d127394260e 6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb kvn parents: 1549 diff changeset	267 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	268 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	269
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	270 size_t CollectedHeap::filler_array_min_size() {
1571 2d127394260e 6916623: Align object to 16 bytes to use Compressed Oops with java heap up to 64Gb kvn parents: 1549 diff changeset	271 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	272 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	273
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	274 size_t CollectedHeap::filler_array_max_size() {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	275 return _filler_array_max_size;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	276 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	277
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	278 #ifdef ASSERT
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	279 void CollectedHeap::fill_args_check(HeapWord* start, size_t words)
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	280 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	281 assert(words >= min_fill_size(), "too small to fill");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	282 assert(words % MinObjAlignment == 0, "unaligned size");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	283 assert(Universe::heap()->is_in_reserved(start), "not in heap");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	284 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	285 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	286
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	287 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	288 {
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	289 if (ZapFillerObjects && zap) {
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	290 Copy::fill_to_words(start + filler_array_hdr_size(),
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	291 words - filler_array_hdr_size(), 0XDEAFBABE);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	292 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	293 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	294 #endif // ASSERT
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	295
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	296 void
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	297 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	298 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	299 assert(words >= filler_array_min_size(), "too small for an array");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	300 assert(words <= filler_array_max_size(), "too big for a single object");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	301
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	302 const size_t payload_size = words - filler_array_hdr_size();
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	303 const size_t len = payload_size * HeapWordSize / sizeof(jint);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	304
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	305 // Set the length first for concurrent GC.
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	306 ((arrayOop)start)->set_length((int)len);
494 d593294016c3 6786195: many nsk.monitoring tests fail with -server -Xcomp jcoomes parents: 481 diff changeset	307 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words);
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	308 DEBUG_ONLY(zap_filler_array(start, words, zap);)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	309 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	310
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	311 void
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	312 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	313 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	314 assert(words <= filler_array_max_size(), "too big for a single object");
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	315
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	316 if (words >= filler_array_min_size()) {
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	317 fill_with_array(start, words, zap);
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	318 } else if (words > 0) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	319 assert(words == min_fill_size(), "unaligned size");
1142 4ce7240d622c 6914300: ciEnv should export all well known classes never parents: 1027 diff changeset	320 post_allocation_setup_common(SystemDictionary::Object_klass(), start,
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	321 words);
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	322 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	323 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	324
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	325 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	326 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	327 DEBUG_ONLY(fill_args_check(start, words);)
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	328 HandleMark hm; // Free handles before leaving.
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	329 fill_with_object_impl(start, words, zap);
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	330 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	331
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	332 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap)
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	333 {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	334 DEBUG_ONLY(fill_args_check(start, words);)
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	335 HandleMark hm; // Free handles before leaving.
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	336
1549 1634cec09505 6953952: collectedHeap.cpp should use #ifdef _LP64 not LP64 ysr parents: 1548 diff changeset	337 #ifdef _LP64
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	338 // A single array can fill ~8G, so multiple objects are needed only in 64-bit.
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	339 // First fill with arrays, ensuring that any remaining space is big enough to
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	340 // fill. The remainder is filled with a single object.
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	341 const size_t min = min_fill_size();
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	342 const size_t max = filler_array_max_size();
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	343 while (words > max) {
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	344 const size_t cur = words - max >= min ? max : max - min;
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	345 fill_with_array(start, cur, zap);
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	346 start += cur;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	347 words -= cur;
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	348 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	349 #endif
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	350
1165 2dd52dea6d28 6902115: G1:assert(ignore_max_completed\|\|thread->is_Java_thread()\|\|SafepointSynchronize::is_at_safepoint()) johnc parents: 1142 diff changeset	351 fill_with_object_impl(start, words, zap);
481 7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	352 }
7d7a7c599c17 6578152: fill_region_with_object has usability and safety issues jcoomes parents: 356 diff changeset	353
0 a61af66fc99e Initial load duke parents: diff changeset	354 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) {
a61af66fc99e Initial load duke parents: diff changeset	355 guarantee(false, "thread-local allocation buffers not supported");
a61af66fc99e Initial load duke parents: diff changeset	356 return NULL;
a61af66fc99e Initial load duke parents: diff changeset	357 }
a61af66fc99e Initial load duke parents: diff changeset	358
a61af66fc99e Initial load duke parents: diff changeset	359 void CollectedHeap::ensure_parsability(bool retire_tlabs) {
a61af66fc99e Initial load duke parents: diff changeset	360 // The second disjunct in the assertion below makes a concession
a61af66fc99e Initial load duke parents: diff changeset	361 // for the start-up verification done while the VM is being
a61af66fc99e Initial load duke parents: diff changeset	362 // created. Callers be careful that you know that mutators
a61af66fc99e Initial load duke parents: diff changeset	363 // aren't going to interfere -- for instance, this is permissible
a61af66fc99e Initial load duke parents: diff changeset	364 // if we are still single-threaded and have either not yet
a61af66fc99e Initial load duke parents: diff changeset	365 // started allocating (nothing much to verify) or we have
a61af66fc99e Initial load duke parents: diff changeset	366 // started allocating but are now a full-fledged JavaThread
a61af66fc99e Initial load duke parents: diff changeset	367 // (and have thus made our TLAB's) available for filling.
a61af66fc99e Initial load duke parents: diff changeset	368 assert(SafepointSynchronize::is_at_safepoint() \|\|
a61af66fc99e Initial load duke parents: diff changeset	369 !is_init_completed(),
a61af66fc99e Initial load duke parents: diff changeset	370 "Should only be called at a safepoint or at start-up"
a61af66fc99e Initial load duke parents: diff changeset	371 " otherwise concurrent mutator activity may make heap "
a61af66fc99e Initial load duke parents: diff changeset	372 " unparsable again");
1166 7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	373 const bool use_tlab = UseTLAB;
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	374 const bool deferred = _defer_initial_card_mark;
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	375 // The main thread starts allocating via a TLAB even before it
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	376 // has added itself to the threads list at vm boot-up.
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	377 assert(!use_tlab \|\| Threads::first() != NULL,
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	378 "Attempt to fill tlabs before main thread has been added"
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	379 " to threads list is doomed to failure!");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	380 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	381 if (use_tlab) thread->tlab().make_parsable(retire_tlabs);
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	382 #ifdef COMPILER2
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	383 // The deferred store barriers must all have been flushed to the
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	384 // card-table (or other remembered set structure) before GC starts
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	385 // processing the card-table (or other remembered set).
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	386 if (deferred) flush_deferred_store_barrier(thread);
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	387 #else
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	388 assert(!deferred, "Should be false");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	389 assert(thread->deferred_card_mark().is_empty(), "Should be empty");
7b0e9cba0307 6896647: card marks can be deferred too long ysr parents: 1165 diff changeset	390 #endif
0 a61af66fc99e Initial load duke parents: diff changeset	391 }
a61af66fc99e Initial load duke parents: diff changeset	392 }
a61af66fc99e Initial load duke parents: diff changeset	393
a61af66fc99e Initial load duke parents: diff changeset	394 void CollectedHeap::accumulate_statistics_all_tlabs() {
a61af66fc99e Initial load duke parents: diff changeset	395 if (UseTLAB) {
a61af66fc99e Initial load duke parents: diff changeset	396 assert(SafepointSynchronize::is_at_safepoint() \|\|
a61af66fc99e Initial load duke parents: diff changeset	397 !is_init_completed(),
a61af66fc99e Initial load duke parents: diff changeset	398 "should only accumulate statistics on tlabs at safepoint");
a61af66fc99e Initial load duke parents: diff changeset	399
a61af66fc99e Initial load duke parents: diff changeset	400 ThreadLocalAllocBuffer::accumulate_statistics_before_gc();
a61af66fc99e Initial load duke parents: diff changeset	401 }
a61af66fc99e Initial load duke parents: diff changeset	402 }
a61af66fc99e Initial load duke parents: diff changeset	403
a61af66fc99e Initial load duke parents: diff changeset	404 void CollectedHeap::resize_all_tlabs() {
a61af66fc99e Initial load duke parents: diff changeset	405 if (UseTLAB) {
a61af66fc99e Initial load duke parents: diff changeset	406 assert(SafepointSynchronize::is_at_safepoint() \|\|
a61af66fc99e Initial load duke parents: diff changeset	407 !is_init_completed(),
a61af66fc99e Initial load duke parents: diff changeset	408 "should only resize tlabs at safepoint");
a61af66fc99e Initial load duke parents: diff changeset	409
a61af66fc99e Initial load duke parents: diff changeset	410 ThreadLocalAllocBuffer::resize_all_tlabs();
a61af66fc99e Initial load duke parents: diff changeset	411 }
a61af66fc99e Initial load duke parents: diff changeset	412 }
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	413
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	414 void CollectedHeap::pre_full_gc_dump() {
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	415 if (HeapDumpBeforeFullGC) {
3869 7f776886a215 6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC ysr parents: 2426 diff changeset	416 TraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, gclog_or_tty);
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	417 // We are doing a "major" collection and a heap dump before
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	418 // major collection has been requested.
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	419 HeapDumper::dump_heap();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	420 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	421 if (PrintClassHistogramBeforeFullGC) {
3869 7f776886a215 6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC ysr parents: 2426 diff changeset	422 TraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, gclog_or_tty);
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	423 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc /, false / ! prologue */);
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	424 inspector.doit();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	425 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	426 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	427
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	428 void CollectedHeap::post_full_gc_dump() {
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	429 if (HeapDumpAfterFullGC) {
3869 7f776886a215 6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC ysr parents: 2426 diff changeset	430 TraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, gclog_or_tty);
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	431 HeapDumper::dump_heap();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	432 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	433 if (PrintClassHistogramAfterFullGC) {
3869 7f776886a215 6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC ysr parents: 2426 diff changeset	434 TraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, gclog_or_tty);
615 c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	435 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc /, false / ! prologue */);
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	436 inspector.doit();
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	437 }
c6c601a0f2d6 6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC ysr parents: 494 diff changeset	438 }

Mercurial > hg > truffle

annotate src/share/vm/gc_interface/collectedHeap.cpp @ 3960:f08d439fab8c