Mercurial > hg > truffle
view src/share/vm/gc_implementation/shared/ageTable.hpp @ 1359:23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
Summary: Make sure that two marking cycles do not overlap, i.e., a new one can only start after the concurrent marking thread finishes all its work. In the fix I piggy-back a couple of minor extra fixes: some general code reformatting for consistency (only around the code I modified), the removal of a field (G1CollectorPolicy::_should_initiate_conc_mark) which doesn't seem to be used at all (it's only set but never read), as well as moving the "is GC locker active" test earlier into the G1 pause / Full GC and using a more appropriate method for it.
Reviewed-by: johnc, jmasa, jcoomes, ysr
author | tonyp |
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date | Tue, 06 Apr 2010 10:59:45 -0400 |
parents | 0fbdb4381b99 |
children | c18cbe5936b8 |
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/* * Copyright 1997-2009 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. * */ /* Copyright 1992-2009 Sun Microsystems, Inc. and Stanford University. See the LICENSE file for license information. */ // Age table for adaptive feedback-mediated tenuring (scavenging) // // Note: all sizes are in oops class ageTable VALUE_OBJ_CLASS_SPEC { friend class VMStructs; public: // constants enum { table_size = markOopDesc::max_age + 1 }; // instance variables size_t sizes[table_size]; // constructor. "global" indicates that this is the global age table // (as opposed to gc-thread-local) ageTable(bool global = true); // clear table void clear(); // add entry void add(oop p, size_t oop_size) { int age = p->age(); assert(age > 0 && age < table_size, "invalid age of object"); sizes[age] += oop_size; } // Merge another age table with the current one. Used // for parallel young generation gc. void merge(ageTable* subTable); void merge_par(ageTable* subTable); // calculate new tenuring threshold based on age information int compute_tenuring_threshold(size_t survivor_capacity); private: PerfVariable* _perf_sizes[table_size]; };