tschatzl@7051: /*
tschatzl@7781:  * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
tschatzl@7051:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
tschatzl@7051:  *
tschatzl@7051:  * This code is free software; you can redistribute it and/or modify it
tschatzl@7051:  * under the terms of the GNU General Public License version 2 only, as
tschatzl@7051:  * published by the Free Software Foundation.
tschatzl@7051:  *
tschatzl@7051:  * This code is distributed in the hope that it will be useful, but WITHOUT
tschatzl@7051:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
tschatzl@7051:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
tschatzl@7051:  * version 2 for more details (a copy is included in the LICENSE file that
tschatzl@7051:  * accompanied this code).
tschatzl@7051:  *
tschatzl@7051:  * You should have received a copy of the GNU General Public License version
tschatzl@7051:  * 2 along with this work; if not, write to the Free Software Foundation,
tschatzl@7051:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
tschatzl@7051:  *
tschatzl@7051:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
tschatzl@7051:  * or visit www.oracle.com if you need additional information or have any
tschatzl@7051:  * questions.
tschatzl@7051:  *
tschatzl@7051:  */
tschatzl@7051: 
tschatzl@7051: #include "precompiled.hpp"
tschatzl@7051: #include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp"
tschatzl@7051: #include "oops/markOop.hpp"
tschatzl@7051: #include "oops/oop.inline.hpp"
tschatzl@7051: #include "services/memTracker.hpp"
tschatzl@7051: #ifdef TARGET_OS_FAMILY_linux
tschatzl@7051: # include "os_linux.inline.hpp"
tschatzl@7051: #endif
tschatzl@7051: #ifdef TARGET_OS_FAMILY_solaris
tschatzl@7051: # include "os_solaris.inline.hpp"
tschatzl@7051: #endif
tschatzl@7051: #ifdef TARGET_OS_FAMILY_windows
tschatzl@7051: # include "os_windows.inline.hpp"
tschatzl@7051: #endif
tschatzl@7051: #ifdef TARGET_OS_FAMILY_aix
tschatzl@7051: # include "os_aix.inline.hpp"
tschatzl@7051: #endif
tschatzl@7051: #ifdef TARGET_OS_FAMILY_bsd
tschatzl@7051: # include "os_bsd.inline.hpp"
tschatzl@7051: #endif
tschatzl@7051: #include "utilities/bitMap.inline.hpp"
tschatzl@7051: 
tschatzl@7781: G1PageBasedVirtualSpace::G1PageBasedVirtualSpace(ReservedSpace rs, size_t used_size, size_t page_size) :
tschatzl@7781:   _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false),
sjohanss@7509:   _dirty(), _executable(false) {
tschatzl@7781:   initialize_with_page_size(rs, used_size, page_size);
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) {
tschatzl@7781:   guarantee(rs.is_reserved(), "Given reserved space must have been reserved already.");
tschatzl@7781: 
tschatzl@7051:   assert(_low_boundary == NULL, "VirtualSpace already initialized");
tschatzl@7781:   assert(page_size > 0, "Page size must be non-zero.");
tschatzl@7781: 
tschatzl@7781:   guarantee(is_ptr_aligned(rs.base(), page_size),
tschatzl@7781:             err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size));
tschatzl@7781:   guarantee(is_size_aligned(used_size, os::vm_page_size()),
tschatzl@7781:             err_msg("Given used reserved space size needs to be OS page size aligned (%d bytes) but is " SIZE_FORMAT, os::vm_page_size(), used_size));
tschatzl@7781:   guarantee(used_size <= rs.size(),
tschatzl@7781:             err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size()));
tschatzl@7781:   guarantee(is_size_aligned(rs.size(), page_size),
tschatzl@7781:             err_msg("Expected that the virtual space is size aligned, but " SIZE_FORMAT " is not aligned to page size " SIZE_FORMAT, rs.size(), page_size));
tschatzl@7051: 
tschatzl@7051:   _low_boundary  = rs.base();
tschatzl@7781:   _high_boundary = _low_boundary + used_size;
tschatzl@7051: 
tschatzl@7051:   _special = rs.special();
tschatzl@7051:   _executable = rs.executable();
tschatzl@7051: 
tschatzl@7051:   _page_size = page_size;
tschatzl@7051: 
tschatzl@7051:   assert(_committed.size() == 0, "virtual space initialized more than once");
tschatzl@7781:   BitMap::idx_t size_in_pages = rs.size() / page_size;
tschatzl@7781:   _committed.resize(size_in_pages, /* in_resource_area */ false);
sjohanss@7509:   if (_special) {
tschatzl@7781:     _dirty.resize(size_in_pages, /* in_resource_area */ false);
sjohanss@7509:   }
tschatzl@7051: 
tschatzl@7781:   _tail_size = used_size % _page_size;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() {
tschatzl@7051:   release();
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: void G1PageBasedVirtualSpace::release() {
tschatzl@7051:   // This does not release memory it never reserved.
tschatzl@7051:   // Caller must release via rs.release();
tschatzl@7051:   _low_boundary           = NULL;
tschatzl@7051:   _high_boundary          = NULL;
tschatzl@7051:   _special                = false;
tschatzl@7051:   _executable             = false;
tschatzl@7051:   _page_size              = 0;
tschatzl@7781:   _tail_size              = 0;
tschatzl@7051:   _committed.resize(0, false);
sjohanss@7509:   _dirty.resize(0, false);
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: size_t G1PageBasedVirtualSpace::committed_size() const {
tschatzl@7781:   size_t result = _committed.count_one_bits() * _page_size;
tschatzl@7781:   // The last page might not be in full.
tschatzl@7781:   if (is_last_page_partial() && _committed.at(_committed.size() - 1)) {
tschatzl@7781:     result -= _page_size - _tail_size;
tschatzl@7781:   }
tschatzl@7781:   return result;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: size_t G1PageBasedVirtualSpace::reserved_size() const {
tschatzl@7051:   return pointer_delta(_high_boundary, _low_boundary, sizeof(char));
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: size_t G1PageBasedVirtualSpace::uncommitted_size()  const {
tschatzl@7051:   return reserved_size() - committed_size();
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const {
tschatzl@7051:   return (addr - _low_boundary) / _page_size;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const {
tschatzl@7781:   size_t end_page = start_page + size_in_pages;
tschatzl@7781:   return _committed.get_next_zero_offset(start_page, end_page) >= end_page;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const {
tschatzl@7781:   size_t end_page = start_page + size_in_pages;
tschatzl@7781:   return _committed.get_next_one_offset(start_page, end_page) >= end_page;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: char* G1PageBasedVirtualSpace::page_start(size_t index) const {
tschatzl@7051:   return _low_boundary + index * _page_size;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const {
tschatzl@7781:   guarantee(index <= _committed.size(),
tschatzl@7781:             err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size()));
tschatzl@7781:   return index == _committed.size();
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) {
tschatzl@7781:   assert(num_pages > 0, "No full pages to commit");
tschatzl@7781:   assert(start + num_pages <= _committed.size(),
tschatzl@7781:            err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " "
tschatzl@7781:                    "that is outside of managed space of " SIZE_FORMAT " pages",
tschatzl@7781:                    start, start + num_pages, _committed.size()));
tschatzl@7781: 
tschatzl@7781:   char* start_addr = page_start(start);
tschatzl@7781:   size_t size = num_pages * _page_size;
tschatzl@7781: 
tschatzl@7781:   os::commit_memory_or_exit(start_addr, size, _page_size, _executable,
tschatzl@7781:                             err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
tschatzl@7781:                                     p2i(start_addr), p2i(start_addr + size), size));
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: void G1PageBasedVirtualSpace::commit_tail() {
tschatzl@7781:   assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here");
tschatzl@7781: 
tschatzl@7781:   char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size);
tschatzl@7781:   os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable,
tschatzl@7781:                             err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".",
tschatzl@7781:                                     p2i(aligned_end_address), p2i(_high_boundary), _tail_size));
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) {
tschatzl@7781:   guarantee(start_page < end_page,
tschatzl@7781:             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
tschatzl@7781:   guarantee(end_page <= _committed.size(),
tschatzl@7781:             err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size()));
tschatzl@7781: 
tschatzl@7781:   size_t pages = end_page - start_page;
tschatzl@7781:   bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial();
tschatzl@7781: 
tschatzl@7781:   // If we have to commit some (partial) tail area, decrease the amount of pages to avoid
tschatzl@7781:   // committing that in the full-page commit code.
tschatzl@7781:   if (need_to_commit_tail) {
tschatzl@7781:     pages--;
tschatzl@7781:   }
tschatzl@7781: 
tschatzl@7781:   if (pages > 0) {
tschatzl@7781:     commit_preferred_pages(start_page, pages);
tschatzl@7781:   }
tschatzl@7781: 
tschatzl@7781:   if (need_to_commit_tail) {
tschatzl@7781:     commit_tail();
tschatzl@7781:   }
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const {
tschatzl@7781:   return MIN2(_high_boundary, page_start(end_page));
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) {
tschatzl@7781:   guarantee(start_page < end_page,
tschatzl@7781:             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
tschatzl@7781: 
tschatzl@7781:   os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page));
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) {
tschatzl@7051:   // We need to make sure to commit all pages covered by the given area.
tschatzl@7781:   guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted");
tschatzl@7051: 
sjohanss@7509:   bool zero_filled = true;
tschatzl@7781:   size_t end_page = start_page + size_in_pages;
sjohanss@7509: 
sjohanss@7509:   if (_special) {
sjohanss@7509:     // Check for dirty pages and update zero_filled if any found.
tschatzl@7781:     if (_dirty.get_next_one_offset(start_page, end_page) < end_page) {
sjohanss@7509:       zero_filled = false;
tschatzl@7781:       _dirty.clear_range(start_page, end_page);
sjohanss@7509:     }
sjohanss@7509:   } else {
tschatzl@7781:     commit_internal(start_page, end_page);
tschatzl@7051:   }
tschatzl@7781:   _committed.set_range(start_page, end_page);
tschatzl@7051: 
tschatzl@7777:   if (AlwaysPreTouch) {
tschatzl@7781:     pretouch_internal(start_page, end_page);
tschatzl@7777:   }
sjohanss@7509:   return zero_filled;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7781: void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) {
tschatzl@7781:   guarantee(start_page < end_page,
tschatzl@7781:             err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page));
tschatzl@7051: 
tschatzl@7781:   char* start_addr = page_start(start_page);
tschatzl@7781:   os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char)));
tschatzl@7781: }
tschatzl@7781: 
tschatzl@7781: void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) {
tschatzl@7781:   guarantee(is_area_committed(start_page, size_in_pages), "checking");
tschatzl@7781: 
tschatzl@7781:   size_t end_page = start_page + size_in_pages;
sjohanss@7509:   if (_special) {
sjohanss@7509:     // Mark that memory is dirty. If committed again the memory might
sjohanss@7509:     // need to be cleared explicitly.
tschatzl@7781:     _dirty.set_range(start_page, end_page);
sjohanss@7509:   } else {
tschatzl@7781:     uncommit_internal(start_page, end_page);
tschatzl@7051:   }
tschatzl@7051: 
tschatzl@7781:   _committed.clear_range(start_page, end_page);
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: bool G1PageBasedVirtualSpace::contains(const void* p) const {
tschatzl@7051:   return _low_boundary <= (const char*) p && (const char*) p < _high_boundary;
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: #ifndef PRODUCT
tschatzl@7051: void G1PageBasedVirtualSpace::print_on(outputStream* out) {
tschatzl@7051:   out->print   ("Virtual space:");
sjohanss@7509:   if (_special) out->print(" (pinned in memory)");
tschatzl@7051:   out->cr();
tschatzl@7051:   out->print_cr(" - committed: " SIZE_FORMAT, committed_size());
tschatzl@7051:   out->print_cr(" - reserved:  " SIZE_FORMAT, reserved_size());
tschatzl@7781:   out->print_cr(" - preferred page size: " SIZE_FORMAT, _page_size);
tschatzl@7781:   out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]",  p2i(_low_boundary), p2i(_high_boundary));
tschatzl@7051: }
tschatzl@7051: 
tschatzl@7051: void G1PageBasedVirtualSpace::print() {
tschatzl@7051:   print_on(tty);
tschatzl@7051: }
tschatzl@7051: #endif