Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * 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);

   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