author | never |
Wed, 06 Jan 2010 14:22:39 -0800 | |
changeset 4571 | 80b553bddc26 |
parent 4030 | 4c471254865e |
child 4636 | 90e004691873 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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# include "incls/_precompiled.incl" |
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# include "incls/_collectedHeap.cpp.incl" |
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#ifdef ASSERT |
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int CollectedHeap::_fire_out_of_memory_count = 0; |
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#endif |
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size_t CollectedHeap::_filler_array_max_size = 0; |
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// Memory state functions. |
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CollectedHeap::CollectedHeap() |
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{ |
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const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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_filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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max_len * elements_per_word); |
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_barrier_set = NULL; |
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_is_gc_active = false; |
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_total_collections = _total_full_collections = 0; |
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_gc_cause = _gc_lastcause = GCCause::_no_gc; |
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NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
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NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) |
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if (UsePerfData) { |
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EXCEPTION_MARK; |
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// create the gc cause jvmstat counters |
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_perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", |
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80, GCCause::to_string(_gc_cause), CHECK); |
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_perf_gc_lastcause = |
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PerfDataManager::create_string_variable(SUN_GC, "lastCause", |
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80, GCCause::to_string(_gc_lastcause), CHECK); |
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} |
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} |
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#ifndef PRODUCT |
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void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { |
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if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
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for (size_t slot = 0; slot < size; slot += 1) { |
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assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), |
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"Found badHeapWordValue in post-allocation check"); |
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} |
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} |
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} |
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void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) |
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{ |
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if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
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for (size_t slot = 0; slot < size; slot += 1) { |
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assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), |
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"Found non badHeapWordValue in pre-allocation check"); |
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} |
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} |
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} |
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#endif // PRODUCT |
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#ifdef ASSERT |
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void CollectedHeap::check_for_valid_allocation_state() { |
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Thread *thread = Thread::current(); |
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// How to choose between a pending exception and a potential |
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// OutOfMemoryError? Don't allow pending exceptions. |
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// This is a VM policy failure, so how do we exhaustively test it? |
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assert(!thread->has_pending_exception(), |
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"shouldn't be allocating with pending exception"); |
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if (StrictSafepointChecks) { |
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assert(thread->allow_allocation(), |
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"Allocation done by thread for which allocation is blocked " |
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"by No_Allocation_Verifier!"); |
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// Allocation of an oop can always invoke a safepoint, |
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// hence, the true argument |
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thread->check_for_valid_safepoint_state(true); |
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} |
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} |
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#endif |
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HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { |
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// Retain tlab and allocate object in shared space if |
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// the amount free in the tlab is too large to discard. |
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if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { |
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thread->tlab().record_slow_allocation(size); |
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return NULL; |
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} |
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// Discard tlab and allocate a new one. |
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// To minimize fragmentation, the last TLAB may be smaller than the rest. |
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size_t new_tlab_size = thread->tlab().compute_size(size); |
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thread->tlab().clear_before_allocation(); |
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if (new_tlab_size == 0) { |
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return NULL; |
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} |
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// Allocate a new TLAB... |
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HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); |
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if (obj == NULL) { |
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return NULL; |
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} |
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if (ZeroTLAB) { |
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// ..and clear it. |
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Copy::zero_to_words(obj, new_tlab_size); |
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} else { |
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// ...and clear just the allocated object. |
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Copy::zero_to_words(obj, size); |
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} |
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thread->tlab().fill(obj, obj + size, new_tlab_size); |
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return obj; |
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} |
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void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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MemRegion deferred = thread->deferred_card_mark(); |
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if (!deferred.is_empty()) { |
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{ |
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// Verify that the storage points to a parsable object in heap |
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DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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assert(is_in(old_obj), "Not in allocated heap"); |
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assert(!can_elide_initializing_store_barrier(old_obj), |
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"Else should have been filtered in defer_store_barrier()"); |
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assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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assert(old_obj->is_oop(true), "Not an oop"); |
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assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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assert(deferred.word_size() == (size_t)(old_obj->size()), |
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"Mismatch: multiple objects?"); |
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} |
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BarrierSet* bs = barrier_set(); |
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assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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bs->write_region(deferred); |
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// "Clear" the deferred_card_mark field |
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thread->set_deferred_card_mark(MemRegion()); |
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} |
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assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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} |
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|
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// Helper for ReduceInitialCardMarks. For performance, |
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// compiled code may elide card-marks for initializing stores |
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// to a newly allocated object along the fast-path. We |
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// compensate for such elided card-marks as follows: |
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// (a) Generational, non-concurrent collectors, such as |
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// GenCollectedHeap(ParNew,DefNew,Tenured) and |
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// ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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// need the card-mark if and only if the region is |
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// in the old gen, and do not care if the card-mark |
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// succeeds or precedes the initializing stores themselves, |
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// so long as the card-mark is completed before the next |
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// scavenge. For all these cases, we can do a card mark |
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// at the point at which we do a slow path allocation |
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// in the old gen. For uniformity, however, we end |
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// up using the same scheme (see below) for all three |
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// cases (deferring the card-mark appropriately). |
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// (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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// in addition that the card-mark for an old gen allocated |
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// object strictly follow any associated initializing stores. |
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// In these cases, the memRegion remembered below is |
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// used to card-mark the entire region either just before the next |
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// slow-path allocation by this thread or just before the next scavenge or |
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// CMS-associated safepoint, whichever of these events happens first. |
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// (The implicit assumption is that the object has been fully |
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// initialized by this point, a fact that we assert when doing the |
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// card-mark.) |
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// (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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// G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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// is used to remember the pre-value of any store. Initializing |
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// stores will not need this barrier, so we need not worry about |
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// compensating for the missing pre-barrier here. Turning now |
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// to the post-barrier, we note that G1 needs a RS update barrier |
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// which simply enqueues a (sequence of) dirty cards which may |
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// optionally be refined by the concurrent update threads. Note |
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// that this barrier need only be applied to a non-young write, |
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// but, like in CMS, because of the presence of concurrent refinement |
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// (much like CMS' precleaning), must strictly follow the oop-store. |
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// Thus, using the same protocol for maintaining the intended |
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// invariants turns out, serendepitously, to be the same for all |
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// three collectors/heap types above. |
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// |
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// For each future collector, this should be reexamined with |
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// that specific collector in mind. |
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oop CollectedHeap::defer_store_barrier(JavaThread* thread, oop new_obj) { |
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// If a previous card-mark was deferred, flush it now. |
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flush_deferred_store_barrier(thread); |
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if (can_elide_initializing_store_barrier(new_obj)) { |
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// The deferred_card_mark region should be empty |
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// following the flush above. |
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assert(thread->deferred_card_mark().is_empty(), "Error"); |
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} else { |
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// Remember info for the newly deferred store barrier |
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MemRegion deferred = MemRegion((HeapWord*)new_obj, new_obj->size()); |
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assert(!deferred.is_empty(), "Error"); |
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thread->set_deferred_card_mark(deferred); |
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} |
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return new_obj; |
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} |
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222 |
|
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size_t CollectedHeap::filler_array_hdr_size() { |
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return size_t(arrayOopDesc::header_size(T_INT)); |
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} |
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226 |
|
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227 |
size_t CollectedHeap::filler_array_min_size() { |
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return align_object_size(filler_array_hdr_size()); |
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} |
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230 |
|
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231 |
size_t CollectedHeap::filler_array_max_size() { |
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return _filler_array_max_size; |
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} |
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234 |
|
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235 |
#ifdef ASSERT |
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236 |
void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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{ |
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assert(words >= min_fill_size(), "too small to fill"); |
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assert(words % MinObjAlignment == 0, "unaligned size"); |
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assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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} |
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243 |
|
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244 |
void CollectedHeap::zap_filler_array(HeapWord* start, size_t words) |
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{ |
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if (ZapFillerObjects) { |
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Copy::fill_to_words(start + filler_array_hdr_size(), |
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words - filler_array_hdr_size(), 0XDEAFBABE); |
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} |
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} |
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#endif // ASSERT |
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252 |
|
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253 |
void |
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254 |
CollectedHeap::fill_with_array(HeapWord* start, size_t words) |
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{ |
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assert(words >= filler_array_min_size(), "too small for an array"); |
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assert(words <= filler_array_max_size(), "too big for a single object"); |
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|
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const size_t payload_size = words - filler_array_hdr_size(); |
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const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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261 |
|
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// Set the length first for concurrent GC. |
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((arrayOop)start)->set_length((int)len); |
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post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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DEBUG_ONLY(zap_filler_array(start, words);) |
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} |
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267 |
|
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268 |
void |
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269 |
CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words) |
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{ |
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271 |
assert(words <= filler_array_max_size(), "too big for a single object"); |
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|
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if (words >= filler_array_min_size()) { |
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274 |
fill_with_array(start, words); |
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} else if (words > 0) { |
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276 |
assert(words == min_fill_size(), "unaligned size"); |
4571 | 277 |
post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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278 |
words); |
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279 |
} |
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280 |
} |
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281 |
|
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282 |
void CollectedHeap::fill_with_object(HeapWord* start, size_t words) |
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283 |
{ |
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284 |
DEBUG_ONLY(fill_args_check(start, words);) |
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HandleMark hm; // Free handles before leaving. |
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286 |
fill_with_object_impl(start, words); |
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} |
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288 |
|
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289 |
void CollectedHeap::fill_with_objects(HeapWord* start, size_t words) |
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{ |
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291 |
DEBUG_ONLY(fill_args_check(start, words);) |
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HandleMark hm; // Free handles before leaving. |
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293 |
|
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294 |
#ifdef LP64 |
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295 |
// A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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// First fill with arrays, ensuring that any remaining space is big enough to |
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297 |
// fill. The remainder is filled with a single object. |
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298 |
const size_t min = min_fill_size(); |
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299 |
const size_t max = filler_array_max_size(); |
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300 |
while (words > max) { |
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301 |
const size_t cur = words - max >= min ? max : max - min; |
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302 |
fill_with_array(start, cur); |
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303 |
start += cur; |
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304 |
words -= cur; |
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305 |
} |
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306 |
#endif |
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307 |
|
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308 |
fill_with_object_impl(start, words); |
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309 |
} |
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310 |
|
1 | 311 |
HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
312 |
guarantee(false, "thread-local allocation buffers not supported"); |
|
313 |
return NULL; |
|
314 |
} |
|
315 |
||
316 |
void CollectedHeap::fill_all_tlabs(bool retire) { |
|
317 |
assert(UseTLAB, "should not reach here"); |
|
318 |
// See note in ensure_parsability() below. |
|
319 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
320 |
!is_init_completed(), |
|
321 |
"should only fill tlabs at safepoint"); |
|
322 |
// The main thread starts allocating via a TLAB even before it |
|
323 |
// has added itself to the threads list at vm boot-up. |
|
324 |
assert(Threads::first() != NULL, |
|
325 |
"Attempt to fill tlabs before main thread has been added" |
|
326 |
" to threads list is doomed to failure!"); |
|
327 |
for(JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
|
328 |
thread->tlab().make_parsable(retire); |
|
329 |
} |
|
330 |
} |
|
331 |
||
332 |
void CollectedHeap::ensure_parsability(bool retire_tlabs) { |
|
333 |
// The second disjunct in the assertion below makes a concession |
|
334 |
// for the start-up verification done while the VM is being |
|
335 |
// created. Callers be careful that you know that mutators |
|
336 |
// aren't going to interfere -- for instance, this is permissible |
|
337 |
// if we are still single-threaded and have either not yet |
|
338 |
// started allocating (nothing much to verify) or we have |
|
339 |
// started allocating but are now a full-fledged JavaThread |
|
340 |
// (and have thus made our TLAB's) available for filling. |
|
341 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
342 |
!is_init_completed(), |
|
343 |
"Should only be called at a safepoint or at start-up" |
|
344 |
" otherwise concurrent mutator activity may make heap " |
|
345 |
" unparsable again"); |
|
346 |
if (UseTLAB) { |
|
347 |
fill_all_tlabs(retire_tlabs); |
|
348 |
} |
|
349 |
} |
|
350 |
||
351 |
void CollectedHeap::accumulate_statistics_all_tlabs() { |
|
352 |
if (UseTLAB) { |
|
353 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
354 |
!is_init_completed(), |
|
355 |
"should only accumulate statistics on tlabs at safepoint"); |
|
356 |
||
357 |
ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); |
|
358 |
} |
|
359 |
} |
|
360 |
||
361 |
void CollectedHeap::resize_all_tlabs() { |
|
362 |
if (UseTLAB) { |
|
363 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
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!is_init_completed(), |
|
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"should only resize tlabs at safepoint"); |
|
366 |
||
367 |
ThreadLocalAllocBuffer::resize_all_tlabs(); |
|
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} |
|
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} |
|
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|
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void CollectedHeap::pre_full_gc_dump() { |
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if (HeapDumpBeforeFullGC) { |
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TraceTime tt("Heap Dump: ", PrintGCDetails, false, gclog_or_tty); |
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// We are doing a "major" collection and a heap dump before |
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// major collection has been requested. |
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HeapDumper::dump_heap(); |
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} |
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if (PrintClassHistogramBeforeFullGC) { |
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TraceTime tt("Class Histogram: ", PrintGCDetails, true, gclog_or_tty); |
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VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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inspector.doit(); |
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} |
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} |
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384 |
|
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void CollectedHeap::post_full_gc_dump() { |
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if (HeapDumpAfterFullGC) { |
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TraceTime tt("Heap Dump", PrintGCDetails, false, gclog_or_tty); |
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HeapDumper::dump_heap(); |
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} |
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if (PrintClassHistogramAfterFullGC) { |
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TraceTime tt("Class Histogram", PrintGCDetails, true, gclog_or_tty); |
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VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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inspector.doit(); |
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} |
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395 |
} |