--- old/src/hotspot/share/gc/g1/heapRegionManagerForHeteroHeap.hpp 2018-11-19 17:24:56.527322600 -0800 +++ /dev/null 2018-11-19 17:24:57.000000000 -0800 @@ -1,132 +0,0 @@ -/* - * Copyright (c) 2018, 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. - * - */ - -#ifndef SHARE_VM_GC_G1_HEAPREGIONMANAGERFORHETEROHEAP_HPP -#define SHARE_VM_GC_G1_HEAPREGIONMANAGERFORHETEROHEAP_HPP - -// This class manages heap regions on heterogenous memory comprising of dram and nv-dimm. -// Regions in dram (dram_set) are used for young objects and archive regions (CDS). -// Regions in nv-dimm (nvdimm_set) are used for old objects and humongous objects. -// At any point there are some regions committed on dram and some on nv-dimm with the following guarantees: -// 1. The total number of regions committed in dram and nv-dimm equals the current size of heap. -// 2. Consequently, total number of regions committed is less than or equal to Xmx. -// 3. To maintain the guarantee stated by 1., whenever one set grows (new regions committed), the other set shrinks (regions un-committed). -// 3a. If more dram regions are needed (young generation expansion), corresponding number of regions in nv-dimm are un-committed. -// 3b. When old generation or humongous set grows, and new regions need to be committed to nv-dimm, corresponding number of regions -// are un-committed in dram. -class HeapRegionManagerForHeteroHeap : public HeapRegionManager { - - uint _max_regions; - uint _max_dram_regions; - uint _max_nvdimm_regions; - uint _total_commited_before_full_gc; - uint _start_index_of_nvdimm; - - uint start_index_of_nvdimm() const; - uint start_index_of_dram() const; - uint end_index_of_nvdimm() const; - uint end_index_of_dram() const; - - uint total_regions_committed() const; - uint num_committed_dram() const; - uint num_committed_nvdimm() const; - - // Similar to find_unavailable_from_idx() function from base class, difference is this function searches in range [start, end]. - uint find_unavailable_in_range(uint start_idx, uint end_idx, uint* res_idx) const; - - // Expand into dram. Maintains the invariant that total number of committed regions is less than current heap size. - uint expand_dram(uint num_regions, WorkGang* pretouch_workers); - - // Expand into nv-dimm. - uint expand_nvdimm(uint num_regions, WorkGang* pretouch_workers); - - // Expand by finding unavailable regions in [start, end] range. - uint expand_in_range(uint start, uint end, uint num_regions, WorkGang* pretouch_workers); - - // Shrink dram set of regions. - uint shrink_dram(uint num_regions, bool update_free_list = true); - - // Shrink nv-dimm set of regions. - uint shrink_nvdimm(uint num_regions, bool update_free_list = true); - - // Shrink regions from [start, end] range. - uint shrink_in_range(uint start, uint end, uint num_regions, bool update_free_list = true); - - // Similar to find_empty_from_idx_reverse() in base class. Only here it searches in a range. - uint find_empty_in_range_reverse(uint start_idx, uint end_idx, uint* res_idx); - - // Similar to find_contiguous() in base class, with [start, end] range - uint find_contiguous(size_t start, size_t end, size_t num, bool empty_only); - - uint free_list_dram_length() const; - uint free_list_nvdimm_length() const; - - // is region with given index in nv-dimm? - bool is_in_nvdimm(uint index) const; - bool is_in_dram(uint index) const; - -public: - - // Empty constructor, we'll initialize it with the initialize() method. - HeapRegionManagerForHeteroHeap(uint num_regions) : _max_regions(num_regions), _max_dram_regions(0), - _max_nvdimm_regions(0), _start_index_of_nvdimm(0) - {} - - // Override. - HeapRegion* get_dummy_region(); - - // Resize dram_set to 'expected_num_regions'. - void resize_dram_regions(uint expected_num_regions, WorkGang* pretouch_workers); - - // Should be called before starting full collection. - void prepare_for_full_collection_start(); - void prepare_for_full_collection_end(); - - virtual HeapRegion* allocate_free_region(bool is_old); - - // Return maximum number of regions that heap can expand to. - uint max_expandable_length() const; - - // Override. Expand in nv-dimm. - uint expand_by(uint num_regions, WorkGang* pretouch_workers); - - // Override. - uint expand_at(uint start, uint num_regions, WorkGang* pretouch_workers); - - // Override. This function is called for humongous allocation, so we need to find empty regions in nv-dimm. - uint find_contiguous_only_empty(size_t num); - - // Override. This function is called for humongous allocation, so we need to find empty or unavailable regions in nv-dimm. - uint find_contiguous_empty_or_unavailable(size_t num); - - // Overrides base class implementation to find highest free region in dram. - uint find_highest_free(bool* expanded); - - // Override. This fuction is called to shrink the heap, we shrink in dram first then in nv-dimm. - uint shrink_by(uint num_regions_to_remove); - - void verify(); -}; - -#endif