Mercurial > hg > graal-jvmci-8
view src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.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) 2001, 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/g1BiasedArray.hpp" #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" #include "memory/allocation.inline.hpp" #include "runtime/virtualspace.hpp" #include "services/memTracker.hpp" #include "utilities/bitMap.inline.hpp" G1RegionToSpaceMapper::G1RegionToSpaceMapper(ReservedSpace rs, size_t used_size, size_t page_size, size_t region_granularity, MemoryType type) : _storage(rs, used_size, page_size), _region_granularity(region_granularity), _listener(NULL), _commit_map() { guarantee(is_power_of_2(page_size), "must be"); guarantee(is_power_of_2(region_granularity), "must be"); MemTracker::record_virtual_memory_type((address)rs.base(), type); } // G1RegionToSpaceMapper implementation where the region granularity is larger than // or the same as the commit granularity. // Basically, the space corresponding to one region region spans several OS pages. class G1RegionsLargerThanCommitSizeMapper : public G1RegionToSpaceMapper { private: size_t _pages_per_region; public: G1RegionsLargerThanCommitSizeMapper(ReservedSpace rs, size_t actual_size, size_t page_size, size_t alloc_granularity, size_t commit_factor, MemoryType type) : G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), _pages_per_region(alloc_granularity / (page_size * commit_factor)) { guarantee(alloc_granularity >= page_size, "allocation granularity smaller than commit granularity"); _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); } virtual void commit_regions(uint start_idx, size_t num_regions) { bool zero_filled = _storage.commit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); _commit_map.set_range(start_idx, start_idx + num_regions); fire_on_commit(start_idx, num_regions, zero_filled); } virtual void uncommit_regions(uint start_idx, size_t num_regions) { _storage.uncommit((size_t)start_idx * _pages_per_region, num_regions * _pages_per_region); _commit_map.clear_range(start_idx, start_idx + num_regions); } }; // G1RegionToSpaceMapper implementation where the region granularity is smaller // than the commit granularity. // Basically, the contents of one OS page span several regions. class G1RegionsSmallerThanCommitSizeMapper : public G1RegionToSpaceMapper { private: class CommitRefcountArray : public G1BiasedMappedArray<uint> { protected: virtual uint default_value() const { return 0; } }; size_t _regions_per_page; CommitRefcountArray _refcounts; uintptr_t region_idx_to_page_idx(uint region) const { return region / _regions_per_page; } public: G1RegionsSmallerThanCommitSizeMapper(ReservedSpace rs, size_t actual_size, size_t page_size, size_t alloc_granularity, size_t commit_factor, MemoryType type) : G1RegionToSpaceMapper(rs, actual_size, page_size, alloc_granularity, type), _regions_per_page((page_size * commit_factor) / alloc_granularity), _refcounts() { guarantee((page_size * commit_factor) >= alloc_granularity, "allocation granularity smaller than commit granularity"); _refcounts.initialize((HeapWord*)rs.base(), (HeapWord*)(rs.base() + align_size_up(rs.size(), page_size)), page_size); _commit_map.resize(rs.size() * commit_factor / alloc_granularity, /* in_resource_area */ false); } virtual void commit_regions(uint start_idx, size_t num_regions) { for (uint i = start_idx; i < start_idx + num_regions; i++) { assert(!_commit_map.at(i), err_msg("Trying to commit storage at region %u that is already committed", i)); size_t idx = region_idx_to_page_idx(i); uint old_refcount = _refcounts.get_by_index(idx); bool zero_filled = false; if (old_refcount == 0) { zero_filled = _storage.commit(idx, 1); } _refcounts.set_by_index(idx, old_refcount + 1); _commit_map.set_bit(i); fire_on_commit(i, 1, zero_filled); } } virtual void uncommit_regions(uint start_idx, size_t num_regions) { for (uint i = start_idx; i < start_idx + num_regions; i++) { assert(_commit_map.at(i), err_msg("Trying to uncommit storage at region %u that is not committed", i)); size_t idx = region_idx_to_page_idx(i); uint old_refcount = _refcounts.get_by_index(idx); assert(old_refcount > 0, "must be"); if (old_refcount == 1) { _storage.uncommit(idx, 1); } _refcounts.set_by_index(idx, old_refcount - 1); _commit_map.clear_bit(i); } } }; void G1RegionToSpaceMapper::fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled) { if (_listener != NULL) { _listener->on_commit(start_idx, num_regions, zero_filled); } } G1RegionToSpaceMapper* G1RegionToSpaceMapper::create_mapper(ReservedSpace rs, size_t actual_size, size_t page_size, size_t region_granularity, size_t commit_factor, MemoryType type) { if (region_granularity >= (page_size * commit_factor)) { return new G1RegionsLargerThanCommitSizeMapper(rs, actual_size, page_size, region_granularity, commit_factor, type); } else { return new G1RegionsSmallerThanCommitSizeMapper(rs, actual_size, page_size, region_granularity, commit_factor, type); } }