view src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp @ 2034:7e37af9d69ef

7011379: G1: overly long concurrent marking cycles Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads. Reviewed-by: johnc, ysr
author tonyp
date Wed, 19 Jan 2011 09:35:17 -0500
parents c18cbe5936b8
children e1162778c1c8
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/*
 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/satbQueue.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/thread.hpp"
#ifdef TARGET_OS_FAMILY_linux
# include "thread_linux.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_solaris
# include "thread_solaris.inline.hpp"
#endif
#ifdef TARGET_OS_FAMILY_windows
# include "thread_windows.inline.hpp"
#endif

G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
                                                 int max_covered_regions) :
    CardTableModRefBSForCTRS(whole_heap, max_covered_regions)
{
  _kind = G1SATBCT;
}


void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
  assert(pre_val->is_oop_or_null(true), "Error");
  if (!JavaThread::satb_mark_queue_set().is_active()) return;
  Thread* thr = Thread::current();
  if (thr->is_Java_thread()) {
    JavaThread* jt = (JavaThread*)thr;
    jt->satb_mark_queue().enqueue(pre_val);
  } else {
    MutexLocker x(Shared_SATB_Q_lock);
    JavaThread::satb_mark_queue_set().shared_satb_queue()->enqueue(pre_val);
  }
}

// When we know the current java thread:
template <class T> void
G1SATBCardTableModRefBS::write_ref_field_pre_static(T* field,
                                                    oop new_val,
                                                    JavaThread* jt) {
  if (!JavaThread::satb_mark_queue_set().is_active()) return;
  T heap_oop = oopDesc::load_heap_oop(field);
  if (!oopDesc::is_null(heap_oop)) {
    oop pre_val = oopDesc::decode_heap_oop_not_null(heap_oop);
    assert(pre_val->is_oop(true /* ignore mark word */), "Error");
    jt->satb_mark_queue().enqueue(pre_val);
  }
}

template <class T> void
G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
  if (!JavaThread::satb_mark_queue_set().is_active()) return;
  T* elem_ptr = dst;
  for (int i = 0; i < count; i++, elem_ptr++) {
    T heap_oop = oopDesc::load_heap_oop(elem_ptr);
    if (!oopDesc::is_null(heap_oop)) {
      enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
    }
  }
}

G1SATBCardTableLoggingModRefBS::
G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
                               int max_covered_regions) :
  G1SATBCardTableModRefBS(whole_heap, max_covered_regions),
  _dcqs(JavaThread::dirty_card_queue_set())
{
  _kind = G1SATBCTLogging;
}

void
G1SATBCardTableLoggingModRefBS::write_ref_field_work(void* field,
                                                     oop new_val) {
  jbyte* byte = byte_for(field);
  if (*byte != dirty_card) {
    *byte = dirty_card;
    Thread* thr = Thread::current();
    if (thr->is_Java_thread()) {
      JavaThread* jt = (JavaThread*)thr;
      jt->dirty_card_queue().enqueue(byte);
    } else {
      MutexLockerEx x(Shared_DirtyCardQ_lock,
                      Mutex::_no_safepoint_check_flag);
      _dcqs.shared_dirty_card_queue()->enqueue(byte);
    }
  }
}

void
G1SATBCardTableLoggingModRefBS::write_ref_field_static(void* field,
                                                       oop new_val) {
  uintptr_t field_uint = (uintptr_t)field;
  uintptr_t new_val_uint = (uintptr_t)new_val;
  uintptr_t comb = field_uint ^ new_val_uint;
  comb = comb >> HeapRegion::LogOfHRGrainBytes;
  if (comb == 0) return;
  if (new_val == NULL) return;
  // Otherwise, log it.
  G1SATBCardTableLoggingModRefBS* g1_bs =
    (G1SATBCardTableLoggingModRefBS*)Universe::heap()->barrier_set();
  g1_bs->write_ref_field_work(field, new_val);
}

void
G1SATBCardTableLoggingModRefBS::invalidate(MemRegion mr, bool whole_heap) {
  jbyte* byte = byte_for(mr.start());
  jbyte* last_byte = byte_for(mr.last());
  Thread* thr = Thread::current();
  if (whole_heap) {
    while (byte <= last_byte) {
      *byte = dirty_card;
      byte++;
    }
  } else {
    // Enqueue if necessary.
    if (thr->is_Java_thread()) {
      JavaThread* jt = (JavaThread*)thr;
      while (byte <= last_byte) {
        if (*byte != dirty_card) {
          *byte = dirty_card;
          jt->dirty_card_queue().enqueue(byte);
        }
        byte++;
      }
    } else {
      MutexLockerEx x(Shared_DirtyCardQ_lock,
                      Mutex::_no_safepoint_check_flag);
      while (byte <= last_byte) {
        if (*byte != dirty_card) {
          *byte = dirty_card;
          _dcqs.shared_dirty_card_queue()->enqueue(byte);
        }
        byte++;
      }
    }
  }
}