Mercurial > hg > graal-compiler
diff src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp @ 20337:1f1d373cd044
8038423: G1: Decommit memory within heap
Summary: Allow G1 to decommit memory of arbitrary regions within the heap and their associated auxiliary data structures card table, BOT, hot card cache, and mark bitmaps.
Reviewed-by: mgerdin, brutisso, jwilhelm
author | tschatzl |
---|---|
date | Thu, 21 Aug 2014 11:47:10 +0200 |
parents | |
children | 8d5f66b42c53 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/g1/g1PageBasedVirtualSpace.cpp Thu Aug 21 11:47:10 2014 +0200 @@ -0,0 +1,171 @@ +/* + * 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), _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) { + _committed.set_range(0, size_in_bits); + } + + 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); +} + +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; +} + +MemRegion 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"); + + if (!_special) { + 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, start + size_in_pages); + + MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize); + return result; +} + +MemRegion G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) { + guarantee(is_area_committed(start, size_in_pages), "checking"); + + if (!_special) { + os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages)); + } + + _committed.clear_range(start, start + size_in_pages); + + MemRegion result((HeapWord*)page_start(start), byte_size_for_pages(size_in_pages) / HeapWordSize); + return result; +} + +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