Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: zArguments.cpp Sprache: C

/*
* Copyright (c) 2017, 2021, 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/z/zAddressSpaceLimit.hpp"
#include "gc/z/zArguments.hpp"
#include "gc/z/zCollectedHeap.hpp"
#include "gc/z/zGlobals.hpp"
#include "gc/z/zHeuristics.hpp"
#include "gc/shared/gcArguments.hpp"
#include "runtime/globals.hpp"
#include "runtime/globals_extension.hpp"
#include "runtime/java.hpp"

void ZArguments::initialize_alignments() {
  SpaceAlignment = ZGranuleSize;
  HeapAlignment = SpaceAlignment;
}

void ZArguments::initialize() {
  GCArguments::initialize();

  // Check mark stack size
  const size_t mark_stack_space_limit = ZAddressSpaceLimit::mark_stack();
  if (ZMarkStackSpaceLimit > mark_stack_space_limit) {
    if (!FLAG_IS_DEFAULT(ZMarkStackSpaceLimit)) {
      vm_exit_during_initialization("ZMarkStackSpaceLimit too large for limited address space");
    }
    FLAG_SET_DEFAULT(ZMarkStackSpaceLimit, mark_stack_space_limit);
  }

  // Enable NUMA by default
  if (FLAG_IS_DEFAULT(UseNUMA)) {
    FLAG_SET_DEFAULT(UseNUMA, true);
  }

  // Select number of parallel threads
  if (FLAG_IS_DEFAULT(ParallelGCThreads)) {
    FLAG_SET_DEFAULT(ParallelGCThreads, ZHeuristics::nparallel_workers());
  }

  if (ParallelGCThreads == 0) {
    vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ParallelGCThreads=0");
  }

  // Select number of concurrent threads
  if (FLAG_IS_DEFAULT(ConcGCThreads)) {
    FLAG_SET_DEFAULT(ConcGCThreads, ZHeuristics::nconcurrent_workers());
  }

  if (ConcGCThreads == 0) {
    vm_exit_during_initialization("The flag -XX:+UseZGC can not be combined with -XX:ConcGCThreads=0");
  }

  // Large page size must match granule size
  if (!FLAG_IS_DEFAULT(LargePageSizeInBytes) && LargePageSizeInBytes != ZGranuleSize) {
    vm_exit_during_initialization(err_msg("Incompatible -XX:LargePageSizeInBytes, only "
                                          SIZE_FORMAT "M large pages are supported by ZGC",
                                          ZGranuleSize / M));
  }

  // The heuristics used when UseDynamicNumberOfGCThreads is
  // enabled defaults to using a ZAllocationSpikeTolerance of 1.
  if (UseDynamicNumberOfGCThreads && FLAG_IS_DEFAULT(ZAllocationSpikeTolerance)) {
    FLAG_SET_DEFAULT(ZAllocationSpikeTolerance, 1);
  }

#ifdef COMPILER2
  // Enable loop strip mining by default
  if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
    FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
    if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
      FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
    }
  }
#endif

  // CompressedOops not supported
  FLAG_SET_DEFAULT(UseCompressedOops, false);

  // Verification before startup and after exit not (yet) supported
  FLAG_SET_DEFAULT(VerifyDuringStartup, false);
  FLAG_SET_DEFAULT(VerifyBeforeExit, false);

  if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) {
    FLAG_SET_DEFAULT(ZVerifyRoots, true);
    FLAG_SET_DEFAULT(ZVerifyObjects, true);
  }
}

size_t ZArguments::heap_virtual_to_physical_ratio() {
  return ZHeapViews * ZVirtualToPhysicalRatio;
}

size_t ZArguments::conservative_max_heap_alignment() {
  return 0;
}

CollectedHeap* ZArguments::create_heap() {
  return new ZCollectedHeap();
}

bool ZArguments::is_supported() const {
  return is_os_supported();
}

¤ Dauer der Verarbeitung: 0.1 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

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.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.