author | sangheki |
Mon, 09 Mar 2015 09:30:16 -0700 | |
changeset 29472 | 740ba666f6bb |
parent 28482 | e1a8d03c342f |
child 30158 | bd6094906ef8 |
permissions | -rw-r--r-- |
26160 | 1 |
/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc_implementation/g1/g1PageBasedVirtualSpace.hpp" |
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#include "oops/markOop.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "services/memTracker.hpp" |
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#ifdef TARGET_OS_FAMILY_linux |
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# include "os_linux.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_solaris |
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# include "os_solaris.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_windows |
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# include "os_windows.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_aix |
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# include "os_aix.inline.hpp" |
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#endif |
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#ifdef TARGET_OS_FAMILY_bsd |
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# include "os_bsd.inline.hpp" |
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#endif |
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#include "utilities/bitMap.inline.hpp" |
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G1PageBasedVirtualSpace::G1PageBasedVirtualSpace() : _low_boundary(NULL), |
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_high_boundary(NULL), _committed(), _page_size(0), _special(false), |
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_dirty(), _executable(false) { |
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} |
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bool G1PageBasedVirtualSpace::initialize_with_granularity(ReservedSpace rs, size_t page_size) { |
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if (!rs.is_reserved()) { |
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return false; // Allocation failed. |
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} |
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assert(_low_boundary == NULL, "VirtualSpace already initialized"); |
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assert(page_size > 0, "Granularity must be non-zero."); |
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_low_boundary = rs.base(); |
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_high_boundary = _low_boundary + rs.size(); |
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_special = rs.special(); |
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_executable = rs.executable(); |
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_page_size = page_size; |
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assert(_committed.size() == 0, "virtual space initialized more than once"); |
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uintx size_in_bits = rs.size() / page_size; |
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_committed.resize(size_in_bits, /* in_resource_area */ false); |
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if (_special) { |
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_dirty.resize(size_in_bits, /* in_resource_area */ false); |
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} |
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return true; |
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} |
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G1PageBasedVirtualSpace::~G1PageBasedVirtualSpace() { |
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release(); |
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} |
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void G1PageBasedVirtualSpace::release() { |
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// This does not release memory it never reserved. |
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// Caller must release via rs.release(); |
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_low_boundary = NULL; |
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_high_boundary = NULL; |
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_special = false; |
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_executable = false; |
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_page_size = 0; |
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_committed.resize(0, false); |
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_dirty.resize(0, false); |
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} |
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size_t G1PageBasedVirtualSpace::committed_size() const { |
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return _committed.count_one_bits() * _page_size; |
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} |
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size_t G1PageBasedVirtualSpace::reserved_size() const { |
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return pointer_delta(_high_boundary, _low_boundary, sizeof(char)); |
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} |
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size_t G1PageBasedVirtualSpace::uncommitted_size() const { |
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return reserved_size() - committed_size(); |
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} |
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uintptr_t G1PageBasedVirtualSpace::addr_to_page_index(char* addr) const { |
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return (addr - _low_boundary) / _page_size; |
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} |
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bool G1PageBasedVirtualSpace::is_area_committed(uintptr_t start, size_t size_in_pages) const { |
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uintptr_t end = start + size_in_pages; |
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return _committed.get_next_zero_offset(start, end) >= end; |
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} |
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bool G1PageBasedVirtualSpace::is_area_uncommitted(uintptr_t start, size_t size_in_pages) const { |
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uintptr_t end = start + size_in_pages; |
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return _committed.get_next_one_offset(start, end) >= end; |
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} |
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char* G1PageBasedVirtualSpace::page_start(uintptr_t index) { |
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return _low_boundary + index * _page_size; |
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} |
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size_t G1PageBasedVirtualSpace::byte_size_for_pages(size_t num) { |
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return num * _page_size; |
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} |
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bool G1PageBasedVirtualSpace::commit(uintptr_t start, size_t size_in_pages) { |
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// We need to make sure to commit all pages covered by the given area. |
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guarantee(is_area_uncommitted(start, size_in_pages), "Specified area is not uncommitted"); |
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bool zero_filled = true; |
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uintptr_t end = start + size_in_pages; |
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if (_special) { |
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// Check for dirty pages and update zero_filled if any found. |
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if (_dirty.get_next_one_offset(start,end) < end) { |
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zero_filled = false; |
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_dirty.clear_range(start, end); |
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} |
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} else { |
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os::commit_memory_or_exit(page_start(start), byte_size_for_pages(size_in_pages), _executable, |
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err_msg("Failed to commit pages from "SIZE_FORMAT" of length "SIZE_FORMAT, start, size_in_pages)); |
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} |
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_committed.set_range(start, end); |
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if (AlwaysPreTouch) { |
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os::pretouch_memory(page_start(start), page_start(end)); |
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} |
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return zero_filled; |
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} |
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void G1PageBasedVirtualSpace::uncommit(uintptr_t start, size_t size_in_pages) { |
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guarantee(is_area_committed(start, size_in_pages), "checking"); |
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if (_special) { |
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// Mark that memory is dirty. If committed again the memory might |
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// need to be cleared explicitly. |
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_dirty.set_range(start, start + size_in_pages); |
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} else { |
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os::uncommit_memory(page_start(start), byte_size_for_pages(size_in_pages)); |
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} |
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_committed.clear_range(start, start + size_in_pages); |
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} |
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bool G1PageBasedVirtualSpace::contains(const void* p) const { |
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return _low_boundary <= (const char*) p && (const char*) p < _high_boundary; |
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} |
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#ifndef PRODUCT |
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void G1PageBasedVirtualSpace::print_on(outputStream* out) { |
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out->print ("Virtual space:"); |
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if (_special) out->print(" (pinned in memory)"); |
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out->cr(); |
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out->print_cr(" - committed: " SIZE_FORMAT, committed_size()); |
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out->print_cr(" - reserved: " SIZE_FORMAT, reserved_size()); |
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out->print_cr(" - [low_b, high_b]: [" INTPTR_FORMAT ", " INTPTR_FORMAT "]", p2i(_low_boundary), p2i(_high_boundary)); |
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} |
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void G1PageBasedVirtualSpace::print() { |
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print_on(tty); |
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} |
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#endif |