Mercurial > hg > graal-jvmci-8
view src/share/vm/memory/permGen.hpp @ 1166:7b0e9cba0307
6896647: card marks can be deferred too long
Summary: Deferred card marks are now flushed during the gc prologue. Parallel[Scavege,OldGC] and SerialGC no longer defer card marks generated by COMPILER2 as a result of ReduceInitialCardMarks. For these cases, introduced a diagnostic option to defer the card marks, only for the purposes of testing and diagnostics. CMS and G1 continue to defer card marks. Potential performance concern related to single-threaded flushing of deferred card marks in the gc prologue will be addressed in the future.
Reviewed-by: never, johnc
author | ysr |
---|---|
date | Wed, 13 Jan 2010 15:26:39 -0800 |
parents | 98cb887364d3 |
children | c18cbe5936b8 |
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/* * Copyright 2000-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // All heaps contains a "permanent generation," containing permanent // (reflective) objects. This is like a regular generation in some ways, // but unlike one in others, and so is split apart. class Generation; class GenRemSet; class CSpaceCounters; // PermGen models the part of the heap class PermGen : public CHeapObj { friend class VMStructs; protected: size_t _capacity_expansion_limit; // maximum expansion allowed without a // full gc occurring HeapWord* mem_allocate_in_gen(size_t size, Generation* gen); public: enum Name { MarkSweepCompact, MarkSweep, ConcurrentMarkSweep }; // Permanent allocation (initialized) virtual HeapWord* mem_allocate(size_t size) = 0; // Mark sweep support virtual void compute_new_size() = 0; // Ideally, we would use MI (IMHO) but we'll do delegation instead. virtual Generation* as_gen() const = 0; virtual void oop_iterate(OopClosure* cl) { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->oop_iterate(cl); } virtual void object_iterate(ObjectClosure* cl) { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->object_iterate(cl); } // Performance Counter support virtual void update_counters() { Generation* g = as_gen(); assert(g != NULL, "as_gen() NULL"); g->update_counters(); } };