hotspot/src/share/vm/gc_interface/collectedHeap.cpp
author jrose
Wed, 02 Jun 2010 22:45:42 -0700
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child 6759 67b1a69ef5aa
permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2001, 2009, 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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# 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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  _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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 {
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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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    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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// 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
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//     invariants turns out, serendepitously, to be the same for both
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//     G1 and CMS.
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//
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// For any future collector, this code should be reexamined with
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// that specific collector in mind, and the documentation above suitably
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// extended and updated.
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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 {
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    MemRegion mr((HeapWord*)new_obj, new_obj->size());
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    assert(!mr.is_empty(), "Error");
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    if (_defer_initial_card_mark) {
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      // Defer the card mark
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      thread->set_deferred_card_mark(mr);
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    } else {
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      // Do the card mark
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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(mr);
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    }
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  }
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  return new_obj;
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}
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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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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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size_t CollectedHeap::filler_array_max_size() {
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  return _filler_array_max_size;
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}
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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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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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}
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#endif // ASSERT
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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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  assert(words <= filler_array_max_size(), "too big for a single object");
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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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  // 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, zap);)
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}
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void
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CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap)
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{
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  assert(words <= filler_array_max_size(), "too big for a single object");
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  if (words >= filler_array_min_size()) {
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    fill_with_array(start, words, zap);
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  } else if (words > 0) {
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    assert(words == min_fill_size(), "unaligned size");
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    post_allocation_setup_common(SystemDictionary::Object_klass(), start,
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                                 words);
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  }
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}
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void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap)
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{
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  DEBUG_ONLY(fill_args_check(start, words);)
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  HandleMark hm;  // Free handles before leaving.
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  fill_with_object_impl(start, words, zap);
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}
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void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap)
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{
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  DEBUG_ONLY(fill_args_check(start, words);)
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  HandleMark hm;  // Free handles before leaving.
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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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  fill_with_object_impl(start, words, zap);
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}
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HeapWord* CollectedHeap::allocate_new_tlab(size_t size) {
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  guarantee(false, "thread-local allocation buffers not supported");
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  return NULL;
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}
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void CollectedHeap::ensure_parsability(bool retire_tlabs) {
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  // The second disjunct in the assertion below makes a concession
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  // for the start-up verification done while the VM is being
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  // created. Callers be careful that you know that mutators
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  // aren't going to interfere -- for instance, this is permissible
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  // if we are still single-threaded and have either not yet
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  // started allocating (nothing much to verify) or we have
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  // started allocating but are now a full-fledged JavaThread
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  // (and have thus made our TLAB's) available for filling.
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  assert(SafepointSynchronize::is_at_safepoint() ||
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         !is_init_completed(),
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         "Should only be called at a safepoint or at start-up"
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         " otherwise concurrent mutator activity may make heap "
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         " unparsable again");
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  const bool use_tlab = UseTLAB;
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  const bool deferred = _defer_initial_card_mark;
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  // The main thread starts allocating via a TLAB even before it
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  // has added itself to the threads list at vm boot-up.
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  assert(!use_tlab || Threads::first() != NULL,
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         "Attempt to fill tlabs before main thread has been added"
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         " to threads list is doomed to failure!");
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  for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) {
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     if (use_tlab) thread->tlab().make_parsable(retire_tlabs);
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#ifdef COMPILER2
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     // The deferred store barriers must all have been flushed to the
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     // card-table (or other remembered set structure) before GC starts
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     // processing the card-table (or other remembered set).
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     if (deferred) flush_deferred_store_barrier(thread);
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#else
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     assert(!deferred, "Should be false");
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     assert(thread->deferred_card_mark().is_empty(), "Should be empty");
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#endif
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  }
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}
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void CollectedHeap::accumulate_statistics_all_tlabs() {
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  if (UseTLAB) {
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    assert(SafepointSynchronize::is_at_safepoint() ||
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         !is_init_completed(),
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         "should only accumulate statistics on tlabs at safepoint");
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    ThreadLocalAllocBuffer::accumulate_statistics_before_gc();
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  }
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}
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void CollectedHeap::resize_all_tlabs() {
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  if (UseTLAB) {
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    assert(SafepointSynchronize::is_at_safepoint() ||
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         !is_init_completed(),
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         "should only resize tlabs at safepoint");
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    ThreadLocalAllocBuffer::resize_all_tlabs();
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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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   400
  }
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}
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   402
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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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   407
  }
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   408
  if (PrintClassHistogramAfterFullGC) {
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   409
    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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}