jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp@340ca8812af9 (annotated)

src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp@340ca8812af9 (annotated)

src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp

Thu, 18 Dec 2014 09:37:02 +0100

author: tschatzl
date: Thu, 18 Dec 2014 09:37:02 +0100
changeset 7777: 340ca8812af9
parent 7509: ae52ee069062
child 7781: 33e421924c67
permissions: -rw-r--r--

8067469: G1 ignores AlwaysPreTouch
Summary: Factor out pretouch code of the various virtual space management classes and use them everywhere including in G1.
Reviewed-by: stefank, ehelin, dholmes

 /*
  * Copyright (c) 2014, 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/g1PageBasedVirtualSpace.hpp"
 #include "oops/markOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "services/memTracker.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_windows
 # include "os_windows.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_aix
 # include "os_aix.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_bsd
 # include "os_bsd.inline.hpp"
 #endif
 #include "utilities/bitMap.inline.hpp"
 G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL),
   _high_boundary(NULL), _committed(), _page_size(0), _special(false),
   _dirty(), _executable(false) {
 }
 bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) {
   if (!rs.is_reserved()) {
     return false;  // Allocation failed.
   }
   assert(_low_boundary == NULL, "VirtualSpace already initialized");
   assert(page_size > 0, "Granularity must be non-zero.");
   _low_boundary  = rs.base();
   _high_boundary = _low_boundary + rs.size();
   _special = rs.special();
   _executable = rs.executable();
   _page_size = page_size;
   assert(_committed.size() == 0, "virtual space initialized more than once");
   uintx size_in_bits = rs.size() / page_size;
   _committed.resize(size_in_bits, /* in_resource_area */ false);
   if (_special) {
     _dirty.resize(size_in_bits, /* in_resource_area */ false);
   }
   return true;
 }
 G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
   release();
 }
 void G1PageBasedVirtualSpace::release() {
   // This does not release memory it never reserved.
   // Caller must release via rs.release();
   _low_boundary           = NULL;
   _high_boundary          = NULL;
   _special                = false;
   _executable             = false;
   _page_size              = 0;
   _committed.resize(0, false);
   _dirty.resize(0, false);
 }
 size_t G1PageBasedVirtualSpace::committed_size() const {
   return _committed.count_one_bits() * _page_size;
 }
 size_t G1PageBasedVirtualSpace::reserved_size() const {
   return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
 }
 size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
   return reserved_size() - committed_size();
 }
 uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
   return (addr - _low_boundary) / _page_size;
 }
 bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const {
   uintptr_t end = start + size_in_pages;
   return _committed.get_next_zero_offset(start, end) >= end;
 }
 bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const {
   uintptr_t end = start + size_in_pages;
   return _committed.get_next_one_offset(start, end) >= end;
 }
 char* G1PageBasedVirtualSpace::page_start(uintptr_t index) {
   return _low_boundary + index * _page_size;
 }
 size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) {
   return num * _page_size;
 }
 bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) {
   // We need to make sure to commit all pages covered by the given area.
   guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted");
   bool zero_filled = true;
   uintptr_t end = start + size_in_pages;
   if (_special) {
     // Check for dirty pages and update zero_filled if any found.
     if (_dirty.get_next_one_offset(start,end) < end) {
       zero_filled = false;
       _dirty.clear_range(start, end);
     }
   } else {
     os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable,
                               err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages));
   }
   _committed.set_range(start, end);
   if (AlwaysPreTouch) {
     os::pretouch_memory(page_start(start), page_start(start) + byte_size_for_pages(size_in_pages));
   }
   return zero_filled;
 }
 void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) {
   guarantee(is_area_committed(start, size_in_pages), "checking");
   if (_special) {
     // Mark that memory is dirty. If committed again the memory might
     // need to be cleared explicitly.
     _dirty.set_range(start, start + size_in_pages);
   } else {
     os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages));
   }
   _committed.clear_range(start, start + size_in_pages);
 }
 bool G1PageBasedVirtualSpace::contains(const void* p) const {
   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
 }
 #ifndef PRODUCT
 void G1PageBasedVirtualSpace::print_on(outputStream* out) {
   out->print   ("Virtual space:");
   if (_special) out->print(" (pinned in memory)");
   out->cr();
   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
   out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
 }
 void G1PageBasedVirtualSpace::print() {
   print_on(tty);
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp@340ca8812af9 (annotated)

src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp