hotspot/src/share/vm/gc_implementation/g1/dirtyCardQueue.cpp
author kvn
Thu, 12 Mar 2009 10:37:46 -0700
changeset 2254 f13dda645a4b
parent 2142 032f4652700c
child 2881 74a1337e4acc
permissions -rw-r--r--
6791178: Specialize for zero as the compressed oop vm heap base Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb. Reviewed-by: never, twisti, jcoomes, coleenp
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/*
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 * Copyright 2001-2008 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/_dirtyCardQueue.cpp.incl"
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bool DirtyCardQueue::apply_closure(CardTableEntryClosure* cl,
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                                   bool consume,
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                                   size_t worker_i) {
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  bool res = true;
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  if (_buf != NULL) {
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    res = apply_closure_to_buffer(cl, _buf, _index, _sz,
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                                  consume,
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                                  (int) worker_i);
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    if (res && consume) _index = _sz;
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  }
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  return res;
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}
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bool DirtyCardQueue::apply_closure_to_buffer(CardTableEntryClosure* cl,
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                                             void** buf,
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                                             size_t index, size_t sz,
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                                             bool consume,
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                                             int worker_i) {
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  if (cl == NULL) return true;
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  for (size_t i = index; i < sz; i += oopSize) {
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    int ind = byte_index_to_index((int)i);
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    jbyte* card_ptr = (jbyte*)buf[ind];
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    if (card_ptr != NULL) {
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      // Set the entry to null, so we don't do it again (via the test
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      // above) if we reconsider this buffer.
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      if (consume) buf[ind] = NULL;
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      if (!cl->do_card_ptr(card_ptr, worker_i)) return false;
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    }
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  }
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  return true;
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}
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#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
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#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
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#endif // _MSC_VER
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DirtyCardQueueSet::DirtyCardQueueSet() :
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  PtrQueueSet(true /*notify_when_complete*/),
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  _closure(NULL),
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  _shared_dirty_card_queue(this, true /*perm*/),
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  _free_ids(NULL),
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  _processed_buffers_mut(0), _processed_buffers_rs_thread(0)
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{
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  _all_active = true;
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}
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size_t DirtyCardQueueSet::num_par_ids() {
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  return MAX2(ParallelGCThreads, (size_t)2);
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}
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void DirtyCardQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
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                                   int max_completed_queue,
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                                   Mutex* lock, PtrQueueSet* fl_owner) {
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  PtrQueueSet::initialize(cbl_mon, fl_lock, max_completed_queue, fl_owner);
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  set_buffer_size(DCQBarrierQueueBufferSize);
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  set_process_completed_threshold(DCQBarrierProcessCompletedThreshold);
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  _shared_dirty_card_queue.set_lock(lock);
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  _free_ids = new FreeIdSet((int) num_par_ids(), _cbl_mon);
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  bool b = _free_ids->claim_perm_id(0);
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  guarantee(b, "Must reserve id zero for concurrent refinement thread.");
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}
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void DirtyCardQueueSet::handle_zero_index_for_thread(JavaThread* t) {
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  t->dirty_card_queue().handle_zero_index();
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}
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void DirtyCardQueueSet::set_closure(CardTableEntryClosure* closure) {
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  _closure = closure;
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}
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void DirtyCardQueueSet::iterate_closure_all_threads(bool consume,
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                                                    size_t worker_i) {
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  assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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  for(JavaThread* t = Threads::first(); t; t = t->next()) {
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    bool b = t->dirty_card_queue().apply_closure(_closure, consume);
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    guarantee(b, "Should not be interrupted.");
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  }
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  bool b = shared_dirty_card_queue()->apply_closure(_closure,
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                                                    consume,
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                                                    worker_i);
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  guarantee(b, "Should not be interrupted.");
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}
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bool DirtyCardQueueSet::mut_process_buffer(void** buf) {
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  // Used to determine if we had already claimed a par_id
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  // before entering this method.
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  bool already_claimed = false;
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  // We grab the current JavaThread.
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  JavaThread* thread = JavaThread::current();
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  // We get the the number of any par_id that this thread
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  // might have already claimed.
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  int worker_i = thread->get_claimed_par_id();
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  // If worker_i is not -1 then the thread has already claimed
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  // a par_id. We make note of it using the already_claimed value
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  if (worker_i != -1) {
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    already_claimed = true;
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  } else {
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    // Otherwise we need to claim a par id
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    worker_i = _free_ids->claim_par_id();
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    // And store the par_id value in the thread
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    thread->set_claimed_par_id(worker_i);
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  }
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  bool b = false;
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  if (worker_i != -1) {
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    b = DirtyCardQueue::apply_closure_to_buffer(_closure, buf, 0,
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                                                _sz, true, worker_i);
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    if (b) Atomic::inc(&_processed_buffers_mut);
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    // If we had not claimed an id before entering the method
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    // then we must release the id.
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    if (!already_claimed) {
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      // we release the id
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      _free_ids->release_par_id(worker_i);
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      // and set the claimed_id in the thread to -1
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      thread->set_claimed_par_id(-1);
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    }
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  }
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  return b;
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}
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DirtyCardQueueSet::CompletedBufferNode*
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DirtyCardQueueSet::get_completed_buffer_lock(int stop_at) {
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  CompletedBufferNode* nd = NULL;
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  MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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  if ((int)_n_completed_buffers <= stop_at) {
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    _process_completed = false;
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    return NULL;
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  }
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  if (_completed_buffers_head != NULL) {
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    nd = _completed_buffers_head;
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    _completed_buffers_head = nd->next;
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    if (_completed_buffers_head == NULL)
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      _completed_buffers_tail = NULL;
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    _n_completed_buffers--;
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  }
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  debug_only(assert_completed_buffer_list_len_correct_locked());
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  return nd;
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}
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// We only do this in contexts where there is no concurrent enqueueing.
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DirtyCardQueueSet::CompletedBufferNode*
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DirtyCardQueueSet::get_completed_buffer_CAS() {
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  CompletedBufferNode* nd = _completed_buffers_head;
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  while (nd != NULL) {
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    CompletedBufferNode* next = nd->next;
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    CompletedBufferNode* result =
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      (CompletedBufferNode*)Atomic::cmpxchg_ptr(next,
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                                                &_completed_buffers_head,
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                                                nd);
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    if (result == nd) {
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      return result;
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    } else {
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      nd = _completed_buffers_head;
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    }
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  }
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  assert(_completed_buffers_head == NULL, "Loop post");
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  _completed_buffers_tail = NULL;
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  return NULL;
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}
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bool DirtyCardQueueSet::
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apply_closure_to_completed_buffer_helper(int worker_i,
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                                         CompletedBufferNode* nd) {
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  if (nd != NULL) {
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    bool b =
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      DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf,
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                                              nd->index, _sz,
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                                              true, worker_i);
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    void** buf = nd->buf;
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    size_t index = nd->index;
1374
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    delete nd;
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    if (b) {
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      deallocate_buffer(buf);
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      return true;  // In normal case, go on to next buffer.
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    } else {
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      enqueue_complete_buffer(buf, index, true);
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      return false;
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    }
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  } else {
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    return false;
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  }
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}
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bool DirtyCardQueueSet::apply_closure_to_completed_buffer(int worker_i,
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                                                          int stop_at,
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                                                          bool with_CAS)
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{
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  CompletedBufferNode* nd = NULL;
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  if (with_CAS) {
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    guarantee(stop_at == 0, "Precondition");
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    nd = get_completed_buffer_CAS();
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  } else {
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    nd = get_completed_buffer_lock(stop_at);
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  }
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  bool res = apply_closure_to_completed_buffer_helper(worker_i, nd);
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  if (res) _processed_buffers_rs_thread++;
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  return res;
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}
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void DirtyCardQueueSet::apply_closure_to_all_completed_buffers() {
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  CompletedBufferNode* nd = _completed_buffers_head;
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  while (nd != NULL) {
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    bool b =
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      DirtyCardQueue::apply_closure_to_buffer(_closure, nd->buf, 0, _sz,
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                                              false);
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    guarantee(b, "Should not stop early.");
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    nd = nd->next;
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  }
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}
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void DirtyCardQueueSet::abandon_logs() {
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  assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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  CompletedBufferNode* buffers_to_delete = NULL;
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  {
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    MutexLockerEx x(_cbl_mon, Mutex::_no_safepoint_check_flag);
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    while (_completed_buffers_head != NULL) {
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      CompletedBufferNode* nd = _completed_buffers_head;
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      _completed_buffers_head = nd->next;
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      nd->next = buffers_to_delete;
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      buffers_to_delete = nd;
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    }
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    _n_completed_buffers = 0;
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    _completed_buffers_tail = NULL;
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    debug_only(assert_completed_buffer_list_len_correct_locked());
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  }
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  while (buffers_to_delete != NULL) {
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    CompletedBufferNode* nd = buffers_to_delete;
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    buffers_to_delete = nd->next;
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    deallocate_buffer(nd->buf);
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    delete nd;
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  }
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  // Since abandon is done only at safepoints, we can safely manipulate
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  // these queues.
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  for (JavaThread* t = Threads::first(); t; t = t->next()) {
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    t->dirty_card_queue().reset();
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  }
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  shared_dirty_card_queue()->reset();
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}
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void DirtyCardQueueSet::concatenate_logs() {
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  // Iterate over all the threads, if we find a partial log add it to
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  // the global list of logs.  Temporarily turn off the limit on the number
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  // of outstanding buffers.
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  int save_max_completed_queue = _max_completed_queue;
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  _max_completed_queue = max_jint;
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  assert(SafepointSynchronize::is_at_safepoint(), "Must be at safepoint.");
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  for (JavaThread* t = Threads::first(); t; t = t->next()) {
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    DirtyCardQueue& dcq = t->dirty_card_queue();
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    if (dcq.size() != 0) {
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      void **buf = t->dirty_card_queue().get_buf();
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      // We must NULL out the unused entries, then enqueue.
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      for (size_t i = 0; i < t->dirty_card_queue().get_index(); i += oopSize) {
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        buf[PtrQueue::byte_index_to_index((int)i)] = NULL;
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      }
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      enqueue_complete_buffer(dcq.get_buf(), dcq.get_index());
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      dcq.reinitialize();
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    }
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  }
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  if (_shared_dirty_card_queue.size() != 0) {
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    enqueue_complete_buffer(_shared_dirty_card_queue.get_buf(),
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                            _shared_dirty_card_queue.get_index());
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    _shared_dirty_card_queue.reinitialize();
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  }
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  // Restore the completed buffer queue limit.
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  _max_completed_queue = save_max_completed_queue;
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}