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view src/share/vm/gc_implementation/g1/heapRegionSets.hpp @ 3766:c3f1170908be
7045330: G1: Simplify/fix the HeapRegionSeq class
7042285: G1: native memory leak during humongous object allocation
6804436: G1: heap region indices should be size_t
Summary: A series of fixes and improvements to the HeapRegionSeq class: a) replace the _regions growable array with a standard C array, b) avoid de-allocating / re-allocating HeapRegion instances when the heap shrinks / grows (fix for 7042285), c) introduce fast method to map address to HeapRegion via a "biased" array pointer, d) embed the _hrs object in G1CollectedHeap, instead of pointing to it via an indirection, e) assume that all the regions added to the HeapRegionSeq instance are contiguous, f) replace int's with size_t's for indexes (and expand that to HeapRegion as part of 6804436), g) remove unnecessary / unused methods, h) rename a couple of fields (_alloc_search_start and _seq_bottom), i) fix iterate_from() not to always start from index 0 irrespective of the region passed to it, j) add a verification method to check the HeapRegionSeq assumptions, k) always call the wrappers for _hrs.iterate(), _hrs_length(), and _hrs.at() from G1CollectedHeap, not those methods directly, and l) unify the code that expands the sequence (by either re-using or creating a new HeapRegion) and make it robust wrt to a HeapRegion allocation failing.
Reviewed-by: stefank, johnc, brutisso
author | tonyp |
---|---|
date | Fri, 10 Jun 2011 13:16:40 -0400 |
parents | ae5b2f1dcf12 |
children | e8b0b0392037 |
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/* * Copyright (c) 2011, 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_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP #include "gc_implementation/g1/heapRegionSet.inline.hpp" //////////////////// FreeRegionList //////////////////// class FreeRegionList : public HeapRegionLinkedList { protected: virtual const char* verify_region_extra(HeapRegion* hr); virtual bool regions_humongous() { return false; } virtual bool regions_empty() { return true; } public: FreeRegionList(const char* name) : HeapRegionLinkedList(name) { } }; //////////////////// MasterFreeRegionList //////////////////// class MasterFreeRegionList : public FreeRegionList { protected: virtual bool check_mt_safety(); public: MasterFreeRegionList(const char* name) : FreeRegionList(name) { } }; //////////////////// SecondaryFreeRegionList //////////////////// class SecondaryFreeRegionList : public FreeRegionList { protected: virtual bool check_mt_safety(); public: SecondaryFreeRegionList(const char* name) : FreeRegionList(name) { } }; //////////////////// HumongousRegionSet //////////////////// class HumongousRegionSet : public HeapRegionSet { protected: virtual const char* verify_region_extra(HeapRegion* hr); virtual bool regions_humongous() { return true; } virtual bool regions_empty() { return false; } public: HumongousRegionSet(const char* name) : HeapRegionSet(name) { } }; //////////////////// MasterHumongousRegionSet //////////////////// class MasterHumongousRegionSet : public HumongousRegionSet { protected: virtual bool check_mt_safety(); public: MasterHumongousRegionSet(const char* name) : HumongousRegionSet(name) { } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSETS_HPP