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view src/share/vm/gc_implementation/g1/g1MarkSweep.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 | f95d63e2154a |
children | f2110083203d |
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/* * Copyright (c) 2001, 2010, 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_G1MARKSWEEP_HPP #define SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" #include "gc_implementation/g1/heapRegion.hpp" #include "memory/genMarkSweep.hpp" #include "memory/generation.hpp" #include "memory/universe.hpp" #include "oops/markOop.hpp" #include "oops/oop.hpp" #include "runtime/timer.hpp" #include "utilities/growableArray.hpp" class ReferenceProcessor; // G1MarkSweep takes care of global mark-compact garbage collection for a // G1CollectedHeap using a four-phase pointer forwarding algorithm. All // generations are assumed to support marking; those that can also support // compaction. // // Class unloading will only occur when a full gc is invoked. class G1MarkSweep : AllStatic { friend class VM_G1MarkSweep; friend class Scavenge; public: static void invoke_at_safepoint(ReferenceProcessor* rp, bool clear_all_softrefs); private: // Mark live objects static void mark_sweep_phase1(bool& marked_for_deopt, bool clear_all_softrefs); // Calculate new addresses static void mark_sweep_phase2(); // Update pointers static void mark_sweep_phase3(); // Move objects to new positions static void mark_sweep_phase4(); static void allocate_stacks(); }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1MARKSWEEP_HPP