Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: nmtUsage.cpp Sprache: C

/*
* Copyright (c) 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 "runtime/threadCritical.hpp"
#include "services/nmtCommon.hpp"
#include "services/nmtUsage.hpp"
#include "services/mallocTracker.hpp"
#include "services/threadStackTracker.hpp"
#include "services/virtualMemoryTracker.hpp"

// Enabled all options for snapshot.
const NMTUsageOptions NMTUsage::OptionsAll = { true, true, true };
// Skip expensive thread stacks when refreshing usage.
const NMTUsageOptions NMTUsage::OptionsNoTS = { false, true, true };

NMTUsage::NMTUsage(NMTUsageOptions options) :
    _malloc_by_type(),
    _malloc_total(),
    _vm_by_type(),
    _vm_total(),
    _usage_options(options) { }

void NMTUsage::walk_thread_stacks() {
  // If backed by virtual memory, snapping the thread stacks involves walking
  // them to to figure out how much memory is committed if they are backed by
  // virtual memory. This needs ot happen before we take the snapshot of the
  // virtual memory since it will update this information.
  if (ThreadStackTracker::track_as_vm()) {
    VirtualMemoryTracker::snapshot_thread_stacks();
  }
}

void NMTUsage::update_malloc_usage() {
  // Thread critical needed keep values in sync, total area size
  // is deducted from mtChunk in the end to give correct values.
  ThreadCritical tc;
  const MallocMemorySnapshot* ms = MallocMemorySummary::as_snapshot();

  size_t total_arena_size = 0;
  for (int i = 0; i < mt_number_of_types; i++) {
    MEMFLAGS flag = NMTUtil::index_to_flag(i);
    const MallocMemory* mm = ms->by_type(flag);
    _malloc_by_type[i] = mm->malloc_size() + mm->arena_size();
    total_arena_size +=  mm->arena_size();
  }

  // Total malloc size.
  _malloc_total = ms->total();

  // Adjustment due to mtChunk double counting.
  _malloc_by_type[NMTUtil::flag_to_index(mtChunk)] -= total_arena_size;
  _malloc_total -= total_arena_size;

  // Adjust mtNMT to include malloc overhead.
  _malloc_by_type[NMTUtil::flag_to_index(mtNMT)] += ms->malloc_overhead();
}

void NMTUsage::update_vm_usage() {
  const VirtualMemorySnapshot* vms = VirtualMemorySummary::as_snapshot();

  // Reset total to allow recalculation.
  _vm_total.committed = 0;
  _vm_total.reserved = 0;
  for (int i = 0; i < mt_number_of_types; i++) {
    MEMFLAGS flag = NMTUtil::index_to_flag(i);
    const VirtualMemory* vm = vms->by_type(flag);

    _vm_by_type[i].reserved = vm->reserved();
    _vm_by_type[i].committed = vm->committed();
    _vm_total.reserved += vm->reserved();
    _vm_total.committed += vm->committed();
  }
}

void NMTUsage::refresh() {
  if (_usage_options.include_malloc) {
    update_malloc_usage();
  }

  if (_usage_options.include_vm) {
    // Thread stacks only makes sense if virtual memory
    // is also included. It must be executed before the
    // over all usage is calculated.
    if (_usage_options.update_thread_stacks) {
      walk_thread_stacks();
    }
    update_vm_usage();
  }
}

size_t NMTUsage::total_reserved() const {
  return _malloc_total + _vm_total.reserved;
}

size_t NMTUsage::total_committed() const {
  return _malloc_total + _vm_total.reserved;
}

size_t NMTUsage::reserved(MEMFLAGS flag) const {
  int index = NMTUtil::flag_to_index(flag);
  return _malloc_by_type[index] + _vm_by_type[index].reserved;
}

size_t NMTUsage::committed(MEMFLAGS flag) const {
  int index = NMTUtil::flag_to_index(flag);
  return _malloc_by_type[index] + _vm_by_type[index].committed;
}

¤ Dauer der Verarbeitung: 0.17 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.