Ziele Untersuchung
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


products/sources/formale Sprachen/Java/Openjdk/src/hotspot/share/gc/shared/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 3 kB

Quelle plab.cpp Sprache: C

/*
* Copyright (c) 2001, 2022, 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/shared/collectedHeap.hpp"
#include "gc/shared/gc_globals.hpp"
#include "gc/shared/plab.inline.hpp"
#include "gc/shared/threadLocalAllocBuffer.hpp"
#include "gc/shared/tlab_globals.hpp"
#include "logging/log.hpp"
#include "memory/universe.hpp"
#include "oops/oop.inline.hpp"
#include "runtime/globals_extension.hpp"

size_t PLAB::min_size() {
  // Make sure that we return something that is larger than AlignmentReserve
  return align_object_size(MAX2(MinTLABSize / HeapWordSize, (size_t)oopDesc::header_size())) + CollectedHeap::lab_alignment_reserve();
}

size_t PLAB::max_size() {
  return ThreadLocalAllocBuffer::max_size();
}

void PLAB::startup_initialization() {
  if (!FLAG_IS_DEFAULT(MinTLABSize)) {
    if (FLAG_IS_DEFAULT(YoungPLABSize)) {
      FLAG_SET_ERGO(YoungPLABSize, MAX2(ThreadLocalAllocBuffer::min_size(), YoungPLABSize));
    }
    if (FLAG_IS_DEFAULT(OldPLABSize)) {
      FLAG_SET_ERGO(OldPLABSize, MAX2(ThreadLocalAllocBuffer::min_size(), OldPLABSize));
    }
  }
}

PLAB::PLAB(size_t desired_plab_sz_) :
  _word_sz(desired_plab_sz_), _bottom(NULL), _top(NULL),
  _end(NULL), _hard_end(NULL), _allocated(0), _wasted(0), _undo_wasted(0)
{
  assert(min_size() > CollectedHeap::lab_alignment_reserve(),
         "Minimum PLAB size " SIZE_FORMAT " must be larger than alignment reserve " SIZE_FORMAT " "
         "to be able to contain objects", min_size(), CollectedHeap::lab_alignment_reserve());
}

void PLAB::flush_and_retire_stats(PLABStats* stats) {
  // Retire the last allocation buffer.
  size_t unused = retire_internal();

  // Now flush the statistics.
  stats->add_allocated(_allocated);
  stats->add_wasted(_wasted);
  stats->add_undo_wasted(_undo_wasted);
  stats->add_unused(unused);

  // Since we have flushed the stats we need to clear  the _allocated and _wasted
  // fields in case somebody retains an instance of this over GCs. Not doing so
  // will artificially inflate the values in the statistics.
  _allocated   = 0;
  _wasted      = 0;
  _undo_wasted = 0;
}

void PLAB::retire() {
  _wasted += retire_internal();
}

size_t PLAB::retire_internal() {
  size_t result = 0;
  if (_top < _hard_end) {
    Universe::heap()->fill_with_dummy_object(_top, _hard_end, true);
    result += invalidate();
  }
  return result;
}

void PLAB::add_undo_waste(HeapWord* obj, size_t word_sz) {
  Universe::heap()->fill_with_dummy_object(obj, obj + word_sz, true);
  _undo_wasted += word_sz;
}

void PLAB::undo_last_allocation(HeapWord* obj, size_t word_sz) {
  assert(pointer_delta(_top, _bottom) >= word_sz, "Bad undo");
  assert(pointer_delta(_top, obj) == word_sz, "Bad undo");
  _top = obj;
}

void PLAB::undo_allocation(HeapWord* obj, size_t word_sz) {
  // Is the alloc in the current alloc buffer?
  if (contains(obj)) {
    assert(contains(obj + word_sz - 1),
      "should contain whole object");
    undo_last_allocation(obj, word_sz);
  } else {
    add_undo_waste(obj, word_sz);
  }
}

quality97%

¤ Dauer der Verarbeitung: 0.4 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.