Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSeq.hpp @ 2152:0fa27f37d4d4
6977804: G1: remove the zero-filling thread
Summary: This changeset removes the zero-filling thread from G1 and collapses the two free region lists we had before (the "free" and "unclean" lists) into one. The new free list uses the new heap region sets / lists abstractions that we'll ultimately use it to keep track of all regions in the heap. A heap region set was also introduced for the humongous regions. Finally, this change increases the concurrency between the thread that completes freeing regions (after a cleanup pause) and the rest of the system (before we'd have to wait for said thread to complete before allocating a new region). The changest also includes a lot of refactoring and code simplification.
Reviewed-by: jcoomes, johnc
| author | tonyp |
|---|---|
| date | Wed, 19 Jan 2011 19:30:42 -0500 |
| parents | 7e37af9d69ef |
| children | 1216415d8e35 |
| rev | line source |
|---|---|
| 342 | 1 /* |
| 2149 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
844
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
844
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
844
diff
changeset
|
21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/heapRegion.hpp" | |
| 29 #include "utilities/growableArray.hpp" | |
| 30 | |
| 342 | 31 class HeapRegion; |
| 32 class HeapRegionClosure; | |
| 33 | |
| 34 class HeapRegionSeq: public CHeapObj { | |
| 35 | |
| 36 // _regions is kept sorted by start address order, and no two regions are | |
| 37 // overlapping. | |
| 38 GrowableArray<HeapRegion*> _regions; | |
| 39 | |
| 40 // The index in "_regions" at which to start the next allocation search. | |
| 41 // (For efficiency only; private to obj_allocate after initialization.) | |
| 42 int _alloc_search_start; | |
| 43 | |
| 2152 | 44 // Finds a contiguous set of empty regions of length num, starting |
| 45 // from a given index. | |
| 46 int find_contiguous_from(int from, size_t num); | |
| 342 | 47 |
| 48 // Currently, we're choosing collection sets in a round-robin fashion, | |
| 49 // starting here. | |
| 50 int _next_rr_candidate; | |
| 51 | |
| 52 // The bottom address of the bottom-most region, or else NULL if there | |
| 53 // are no regions in the sequence. | |
| 54 char* _seq_bottom; | |
| 55 | |
| 56 public: | |
| 57 // Initializes "this" to the empty sequence of regions. | |
| 393 | 58 HeapRegionSeq(const size_t max_size); |
| 342 | 59 |
| 60 // Adds "hr" to "this" sequence. Requires "hr" not to overlap with | |
| 61 // any region already in "this". (Will perform better if regions are | |
| 62 // inserted in ascending address order.) | |
| 63 void insert(HeapRegion* hr); | |
| 64 | |
| 65 // Given a HeapRegion*, returns its index within _regions, | |
| 66 // or returns -1 if not found. | |
| 67 int find(HeapRegion* hr); | |
| 68 | |
| 69 // Requires the index to be valid, and return the region at the index. | |
| 70 HeapRegion* at(size_t i) { return _regions.at((int)i); } | |
| 71 | |
| 72 // Return the number of regions in the sequence. | |
| 73 size_t length(); | |
| 74 | |
| 75 // Returns the number of contiguous regions at the end of the sequence | |
| 76 // that are available for allocation. | |
| 77 size_t free_suffix(); | |
| 78 | |
| 2152 | 79 // Finds a contiguous set of empty regions of length num. |
| 80 int find_contiguous(size_t num); | |
| 342 | 81 |
| 82 // Apply the "doHeapRegion" method of "blk" to all regions in "this", | |
| 83 // in address order, terminating the iteration early | |
| 84 // if the "doHeapRegion" method returns "true". | |
| 85 void iterate(HeapRegionClosure* blk); | |
| 86 | |
| 87 // Apply the "doHeapRegion" method of "blk" to all regions in "this", | |
| 88 // starting at "r" (or first region, if "r" is NULL), in a circular | |
| 89 // manner, terminating the iteration early if the "doHeapRegion" method | |
| 90 // returns "true". | |
| 91 void iterate_from(HeapRegion* r, HeapRegionClosure* blk); | |
| 92 | |
| 93 // As above, but start from a given index in the sequence | |
| 94 // instead of a given heap region. | |
| 95 void iterate_from(int idx, HeapRegionClosure* blk); | |
| 96 | |
| 97 // Requires "shrink_bytes" to be a multiple of the page size and heap | |
| 98 // region granularity. Deletes as many "rightmost" completely free heap | |
| 99 // regions from the sequence as comprise shrink_bytes bytes. Returns the | |
| 100 // MemRegion indicating the region those regions comprised, and sets | |
| 101 // "num_regions_deleted" to the number of regions deleted. | |
| 102 MemRegion shrink_by(size_t shrink_bytes, size_t& num_regions_deleted); | |
| 103 | |
| 104 // If "addr" falls within a region in the sequence, return that region, | |
| 105 // or else NULL. | |
| 2149 | 106 inline HeapRegion* addr_to_region(const void* addr); |
| 342 | 107 |
| 108 void print(); | |
| 109 | |
| 677 | 110 // Prints out runs of empty regions. |
| 111 void print_empty_runs(); | |
| 342 | 112 |
| 113 }; | |
| 1972 | 114 |
| 115 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_HPP |