Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 23287:bd88fd590f4e
Restore G1 changes from e13c65f874e5 after merge
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Fri, 08 Jan 2016 15:46:55 +0100 |
parents | 33e421924c67 |
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/* * Copyright (c) 2014, 2015, 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(ReservedSpace rs, size_t used_size, size_t page_size) : _low_boundary(NULL), _high_boundary(NULL), _committed(), _page_size(0), _special(false), _dirty(), _executable(false) { initialize_with_page_size(rs, used_size, page_size); } void G1PageBasedVirtualSpace::initialize_with_page_size(ReservedSpace rs, size_t used_size, size_t page_size) { guarantee(rs.is_reserved(), "Given reserved space must have been reserved already."); assert(_low_boundary == NULL, "VirtualSpace already initialized"); assert(page_size > 0, "Page size must be non-zero."); guarantee(is_ptr_aligned(rs.base(), page_size), err_msg("Reserved space base " PTR_FORMAT " is not aligned to requested page size " SIZE_FORMAT, p2i(rs.base()), page_size)); guarantee(is_size_aligned(used_size, os::vm_page_size()), 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)); guarantee(used_size <= rs.size(), err_msg("Used size of reserved space " SIZE_FORMAT " bytes is smaller than reservation at " SIZE_FORMAT " bytes", used_size, rs.size())); guarantee(is_size_aligned(rs.size(), page_size), 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)); _low_boundary = rs.base(); _high_boundary = _low_boundary + used_size; _special = rs.special(); _executable = rs.executable(); _page_size = page_size; assert(_committed.size() == 0, "virtual space initialized more than once"); BitMap::idx_t size_in_pages = rs.size() / page_size; _committed.resize(size_in_pages, /* in_resource_area */ false); if (_special) { _dirty.resize(size_in_pages, /* in_resource_area */ false); } _tail_size = used_size % _page_size; } 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; _tail_size = 0; _committed.resize(0, false); _dirty.resize(0, false); } size_t G1PageBasedVirtualSpace::committed_size() const { size_t result = _committed.count_one_bits() * _page_size; // The last page might not be in full. if (is_last_page_partial() && _committed.at(_committed.size() - 1)) { result -= _page_size - _tail_size; } return result; } 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(); } size_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { return (addr - _low_boundary) / _page_size; } bool G1PageBasedVirtualSpace::is_area_committed(size_t start_page, size_t size_in_pages) const { size_t end_page = start_page + size_in_pages; return _committed.get_next_zero_offset(start_page, end_page) >= end_page; } bool G1PageBasedVirtualSpace::is_area_uncommitted(size_t start_page, size_t size_in_pages) const { size_t end_page = start_page + size_in_pages; return _committed.get_next_one_offset(start_page, end_page) >= end_page; } char* G1PageBasedVirtualSpace::page_start(size_t index) const { return _low_boundary + index * _page_size; } bool G1PageBasedVirtualSpace::is_after_last_page(size_t index) const { guarantee(index <= _committed.size(), err_msg("Given boundary page " SIZE_FORMAT " is beyond managed page count " SIZE_FORMAT, index, _committed.size())); return index == _committed.size(); } void G1PageBasedVirtualSpace::commit_preferred_pages(size_t start, size_t num_pages) { assert(num_pages > 0, "No full pages to commit"); assert(start + num_pages <= _committed.size(), err_msg("Tried to commit area from page " SIZE_FORMAT " to page " SIZE_FORMAT " " "that is outside of managed space of " SIZE_FORMAT " pages", start, start + num_pages, _committed.size())); char* start_addr = page_start(start); size_t size = num_pages * _page_size; os::commit_memory_or_exit(start_addr, size, _page_size, _executable, err_msg("Failed to commit area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".", p2i(start_addr), p2i(start_addr + size), size)); } void G1PageBasedVirtualSpace::commit_tail() { assert(_tail_size > 0, "The size of the tail area must be > 0 when reaching here"); char* const aligned_end_address = (char*)align_ptr_down(_high_boundary, _page_size); os::commit_memory_or_exit(aligned_end_address, _tail_size, os::vm_page_size(), _executable, err_msg("Failed to commit tail area from " PTR_FORMAT " to " PTR_FORMAT " of length " SIZE_FORMAT ".", p2i(aligned_end_address), p2i(_high_boundary), _tail_size)); } void G1PageBasedVirtualSpace::commit_internal(size_t start_page, size_t end_page) { guarantee(start_page < end_page, err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); guarantee(end_page <= _committed.size(), err_msg("Given end page " SIZE_FORMAT " is beyond end of managed page amount of " SIZE_FORMAT, end_page, _committed.size())); size_t pages = end_page - start_page; bool need_to_commit_tail = is_after_last_page(end_page) && is_last_page_partial(); // If we have to commit some (partial) tail area, decrease the amount of pages to avoid // committing that in the full-page commit code. if (need_to_commit_tail) { pages--; } if (pages > 0) { commit_preferred_pages(start_page, pages); } if (need_to_commit_tail) { commit_tail(); } } char* G1PageBasedVirtualSpace::bounded_end_addr(size_t end_page) const { return MIN2(_high_boundary, page_start(end_page)); } void G1PageBasedVirtualSpace::pretouch_internal(size_t start_page, size_t end_page) { guarantee(start_page < end_page, err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); os::pretouch_memory(page_start(start_page), bounded_end_addr(end_page)); } bool G1PageBasedVirtualSpace::commit(size_t start_page, size_t size_in_pages) { // We need to make sure to commit all pages covered by the given area. guarantee(is_area_uncommitted(start_page, size_in_pages), "Specified area is not uncommitted"); bool zero_filled = true; size_t end_page = start_page + size_in_pages; if (_special) { // Check for dirty pages and update zero_filled if any found. if (_dirty.get_next_one_offset(start_page, end_page) < end_page) { zero_filled = false; _dirty.clear_range(start_page, end_page); } } else { commit_internal(start_page, end_page); } _committed.set_range(start_page, end_page); if (AlwaysPreTouch) { pretouch_internal(start_page, end_page); } return zero_filled; } void G1PageBasedVirtualSpace::uncommit_internal(size_t start_page, size_t end_page) { guarantee(start_page < end_page, err_msg("Given start page " SIZE_FORMAT " is larger or equal to end page " SIZE_FORMAT, start_page, end_page)); char* start_addr = page_start(start_page); os::uncommit_memory(start_addr, pointer_delta(bounded_end_addr(end_page), start_addr, sizeof(char))); } void G1PageBasedVirtualSpace::uncommit(size_t start_page, size_t size_in_pages) { guarantee(is_area_committed(start_page, size_in_pages), "checking"); size_t end_page = start_page + size_in_pages; if (_special) { // Mark that memory is dirty. If committed again the memory might // need to be cleared explicitly. _dirty.set_range(start_page, end_page); } else { uncommit_internal(start_page, end_page); } _committed.clear_range(start_page, end_page); } 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(" - preferred page size: " SIZE_FORMAT, _page_size); out->print_cr(" - [low_b, high_b]: [" PTR_FORMAT ", " PTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary)); } void G1PageBasedVirtualSpace::print() { print_on(tty); } #endif