author | never |
Sun, 25 Sep 2011 16:03:29 -0700 | |
changeset 10565 | dc90c239f4ec |
parent 10519 | fb373fa38321 |
child 10742 | a64c942e4e6b |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2001, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "gc_implementation/shared/vmGCOperations.hpp" |
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#include "gc_interface/collectedHeap.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/init.hpp" |
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#include "services/heapDumper.hpp" |
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#ifdef TARGET_OS_FAMILY_linux |
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# include "thread_linux.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_solaris |
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# include "thread_solaris.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_windows |
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# include "thread_windows.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_bsd |
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# include "thread_bsd.inline.hpp" |
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#endif |
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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() : _n_par_threads(0) |
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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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_defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
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} |
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void CollectedHeap::pre_initialize() { |
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// Used for ReduceInitialCardMarks (when COMPILER2 is used); |
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// otherwise remains unused. |
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#ifdef COMPILER2 |
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_defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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&& (DeferInitialCardMark || card_mark_must_follow_store()); |
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#else |
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assert(_defer_initial_card_mark == false, "Who would set it?"); |
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#endif |
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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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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 zap just allocated object. |
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#ifdef ASSERT |
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// Skip mangling the space corresponding to the object header to |
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// ensure that the returned space is not considered parsable by |
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// any concurrent GC thread. |
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size_t hdr_size = oopDesc::header_size(); |
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Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); |
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#endif // ASSERT |
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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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assert(_defer_initial_card_mark, "Otherwise should be 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 new_store_pre_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, i.e. in this call. |
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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 |
4637 | 237 |
// invariants turns out, serendepitously, to be the same for both |
238 |
// G1 and CMS. |
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// |
4637 | 240 |
// For any future collector, this code should be reexamined with |
241 |
// that specific collector in mind, and the documentation above suitably |
|
242 |
// extended and updated. |
|
243 |
oop CollectedHeap::new_store_pre_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 { |
4637 | 251 |
MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
252 |
assert(!mr.is_empty(), "Error"); |
|
253 |
if (_defer_initial_card_mark) { |
|
254 |
// Defer the card mark |
|
255 |
thread->set_deferred_card_mark(mr); |
|
256 |
} else { |
|
257 |
// Do the card mark |
|
258 |
BarrierSet* bs = barrier_set(); |
|
259 |
assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
|
260 |
bs->write_region(mr); |
|
261 |
} |
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} |
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return new_obj; |
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} |
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265 |
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size_t CollectedHeap::filler_array_hdr_size() { |
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return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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} |
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269 |
|
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size_t CollectedHeap::filler_array_min_size() { |
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return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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} |
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273 |
|
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size_t CollectedHeap::filler_array_max_size() { |
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return _filler_array_max_size; |
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} |
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277 |
|
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#ifdef ASSERT |
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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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286 |
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void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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{ |
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if (ZapFillerObjects && zap) { |
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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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293 |
} |
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#endif // ASSERT |
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295 |
|
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void |
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CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
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{ |
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assert(words >= filler_array_min_size(), "too small for an array"); |
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300 |
assert(words <= filler_array_max_size(), "too big for a single object"); |
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301 |
|
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const size_t payload_size = words - filler_array_hdr_size(); |
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303 |
const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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304 |
|
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// Set the length first for concurrent GC. |
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306 |
((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, zap);) |
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309 |
} |
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310 |
|
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311 |
void |
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312 |
CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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313 |
{ |
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314 |
assert(words <= filler_array_max_size(), "too big for a single object"); |
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315 |
|
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316 |
if (words >= filler_array_min_size()) { |
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fill_with_array(start, words, zap); |
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318 |
} else if (words > 0) { |
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319 |
assert(words == min_fill_size(), "unaligned size"); |
4571 | 320 |
post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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321 |
words); |
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322 |
} |
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323 |
} |
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324 |
|
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325 |
void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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326 |
{ |
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327 |
DEBUG_ONLY(fill_args_check(start, words);) |
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328 |
HandleMark hm; // Free handles before leaving. |
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329 |
fill_with_object_impl(start, words, zap); |
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330 |
} |
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331 |
|
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void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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333 |
{ |
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DEBUG_ONLY(fill_args_check(start, words);) |
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335 |
HandleMark hm; // Free handles before leaving. |
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336 |
|
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#ifdef _LP64 |
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// 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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// fill. The remainder is filled with a single object. |
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const size_t min = min_fill_size(); |
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const size_t max = filler_array_max_size(); |
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while (words > max) { |
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const size_t cur = words - max >= min ? max : max - min; |
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fill_with_array(start, cur, zap); |
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start += cur; |
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words -= cur; |
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} |
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#endif |
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350 |
|
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fill_with_object_impl(start, words, zap); |
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6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1388
diff
changeset
|
352 |
} |
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1388
diff
changeset
|
353 |
|
1 | 354 |
HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
355 |
guarantee(false, "thread-local allocation buffers not supported"); |
|
356 |
return NULL; |
|
357 |
} |
|
358 |
||
359 |
void CollectedHeap::ensure_parsability(bool retire_tlabs) { |
|
360 |
// The second disjunct in the assertion below makes a concession |
|
361 |
// for the start-up verification done while the VM is being |
|
362 |
// created. Callers be careful that you know that mutators |
|
363 |
// aren't going to interfere -- for instance, this is permissible |
|
364 |
// if we are still single-threaded and have either not yet |
|
365 |
// started allocating (nothing much to verify) or we have |
|
366 |
// started allocating but are now a full-fledged JavaThread |
|
367 |
// (and have thus made our TLAB's) available for filling. |
|
368 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
369 |
!is_init_completed(), |
|
370 |
"Should only be called at a safepoint or at start-up" |
|
371 |
" otherwise concurrent mutator activity may make heap " |
|
372 |
" unparsable again"); |
|
4637 | 373 |
const bool use_tlab = UseTLAB; |
374 |
const bool deferred = _defer_initial_card_mark; |
|
375 |
// The main thread starts allocating via a TLAB even before it |
|
376 |
// has added itself to the threads list at vm boot-up. |
|
377 |
assert(!use_tlab || Threads::first() != NULL, |
|
378 |
"Attempt to fill tlabs before main thread has been added" |
|
379 |
" to threads list is doomed to failure!"); |
|
380 |
for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { |
|
381 |
if (use_tlab) thread->tlab().make_parsable(retire_tlabs); |
|
382 |
#ifdef COMPILER2 |
|
383 |
// The deferred store barriers must all have been flushed to the |
|
384 |
// card-table (or other remembered set structure) before GC starts |
|
385 |
// processing the card-table (or other remembered set). |
|
386 |
if (deferred) flush_deferred_store_barrier(thread); |
|
387 |
#else |
|
388 |
assert(!deferred, "Should be false"); |
|
389 |
assert(thread->deferred_card_mark().is_empty(), "Should be empty"); |
|
390 |
#endif |
|
1 | 391 |
} |
392 |
} |
|
393 |
||
394 |
void CollectedHeap::accumulate_statistics_all_tlabs() { |
|
395 |
if (UseTLAB) { |
|
396 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
397 |
!is_init_completed(), |
|
398 |
"should only accumulate statistics on tlabs at safepoint"); |
|
399 |
||
400 |
ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); |
|
401 |
} |
|
402 |
} |
|
403 |
||
404 |
void CollectedHeap::resize_all_tlabs() { |
|
405 |
if (UseTLAB) { |
|
406 |
assert(SafepointSynchronize::is_at_safepoint() || |
|
407 |
!is_init_completed(), |
|
408 |
"should only resize tlabs at safepoint"); |
|
409 |
||
410 |
ThreadLocalAllocBuffer::resize_all_tlabs(); |
|
411 |
} |
|
412 |
} |
|
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
413 |
|
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
414 |
void CollectedHeap::pre_full_gc_dump() { |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
415 |
if (HeapDumpBeforeFullGC) { |
10282
aa2bcd7f4149
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
8921
diff
changeset
|
416 |
TraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, gclog_or_tty); |
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
417 |
// We are doing a "major" collection and a heap dump before |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
418 |
// major collection has been requested. |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
419 |
HeapDumper::dump_heap(); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
420 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
421 |
if (PrintClassHistogramBeforeFullGC) { |
10282
aa2bcd7f4149
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
8921
diff
changeset
|
422 |
TraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, gclog_or_tty); |
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
423 |
VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
424 |
inspector.doit(); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
425 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
426 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
427 |
|
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
428 |
void CollectedHeap::post_full_gc_dump() { |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
429 |
if (HeapDumpAfterFullGC) { |
10282
aa2bcd7f4149
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
8921
diff
changeset
|
430 |
TraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, gclog_or_tty); |
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
431 |
HeapDumper::dump_heap(); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
432 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
433 |
if (PrintClassHistogramAfterFullGC) { |
10282
aa2bcd7f4149
6810861: G1: support -XX:+{PrintClassHistogram,HeapDump}{Before,After}FullGC
ysr
parents:
8921
diff
changeset
|
434 |
TraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, gclog_or_tty); |
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
435 |
VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
436 |
inspector.doit(); |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
437 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
1681
diff
changeset
|
438 |
} |