Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/vm_operations_g1.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 | c798c277ddd1 |
children | db89aa49298f |
line wrap: on
line source
/* * Copyright (c) 2001, 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_VM_OPERATIONS_G1_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP #include "gc_implementation/shared/vmGCOperations.hpp" // VM_operations for the G1 collector. // VM_GC_Operation: // - VM_CGC_Operation // - VM_G1CollectFull // - VM_G1OperationWithAllocRequest // - VM_G1CollectForAllocation // - VM_G1IncCollectionPause class VM_G1OperationWithAllocRequest: public VM_GC_Operation { protected: size_t _word_size; HeapWord* _result; bool _pause_succeeded; public: VM_G1OperationWithAllocRequest(unsigned int gc_count_before, size_t word_size) : VM_GC_Operation(gc_count_before, GCCause::_allocation_failure), _word_size(word_size), _result(NULL), _pause_succeeded(false) { } HeapWord* result() { return _result; } bool pause_succeeded() { return _pause_succeeded; } }; class VM_G1CollectFull: public VM_GC_Operation { public: VM_G1CollectFull(unsigned int gc_count_before, unsigned int full_gc_count_before, GCCause::Cause cause) : VM_GC_Operation(gc_count_before, cause, full_gc_count_before) { } virtual VMOp_Type type() const { return VMOp_G1CollectFull; } virtual void doit(); virtual const char* name() const { return "full garbage-first collection"; } }; class VM_G1CollectForAllocation: public VM_G1OperationWithAllocRequest { public: VM_G1CollectForAllocation(unsigned int gc_count_before, size_t word_size); virtual VMOp_Type type() const { return VMOp_G1CollectForAllocation; } virtual void doit(); virtual const char* name() const { return "garbage-first collection to satisfy allocation"; } }; class VM_G1IncCollectionPause: public VM_G1OperationWithAllocRequest { private: bool _should_initiate_conc_mark; double _target_pause_time_ms; unsigned int _full_collections_completed_before; public: VM_G1IncCollectionPause(unsigned int gc_count_before, size_t word_size, bool should_initiate_conc_mark, double target_pause_time_ms, GCCause::Cause gc_cause); virtual VMOp_Type type() const { return VMOp_G1IncCollectionPause; } virtual void doit(); virtual void doit_epilogue(); virtual const char* name() const { return "garbage-first incremental collection pause"; } }; // Concurrent GC stop-the-world operations such as initial and final mark; // consider sharing these with CMS's counterparts. class VM_CGC_Operation: public VM_Operation { VoidClosure* _cl; const char* _printGCMessage; public: VM_CGC_Operation(VoidClosure* cl, const char *printGCMsg) : _cl(cl), _printGCMessage(printGCMsg) { } virtual VMOp_Type type() const { return VMOp_CGC_Operation; } virtual void doit(); virtual bool doit_prologue(); virtual void doit_epilogue(); virtual const char* name() const { return "concurrent gc"; } }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_VM_OPERATIONS_G1_HPP