Mercurial > hg > truffle
annotate src/share/vm/runtime/aprofiler.hpp @ 2368:dde920245681
6896099: Integrate CMS heap ergo with default heap sizing ergo
6627787: CMS: JVM refuses to start up with -Xms16m -Xmx16m
7000125: CMS: Anti-monotone young gen sizing with respect to maximum whole heap size specification
7027529: CMS: retire CMSUseOldDefaults flag
Summary: Simplify CMS heap sizing code, relying on ergonomic initial sizing consistent with other collectors for the most part, controlling only young gen sizing to rein in pause times. Make CMS young gen sizing default statically cpu-dependant. Remove inconsistencies wrt generation sizing and policy code, allowing for the fixing for 6627787 and 7000125. For 7027529, retire the flag CMSUseOldDefaults which had been introduced as a bridge from JDK 5 to JDK 6 a number of years ago.
Reviewed-by: brutisso, poonam
| author | ysr |
|---|---|
| date | Wed, 16 Mar 2011 10:37:08 -0700 |
| parents | f95d63e2154a |
| children | da91efe96a93 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_APROFILER_HPP |
| 26 #define SHARE_VM_RUNTIME_APROFILER_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "memory/universe.hpp" | |
| 30 #include "oops/klass.hpp" | |
| 31 #include "oops/klassOop.hpp" | |
| 32 #include "utilities/top.hpp" | |
| 33 | |
| 0 | 34 // A simple allocation profiler for Java. The profiler collects and prints |
| 35 // the number and total size of instances allocated per class, including | |
| 36 // array classes. | |
| 37 // | |
| 38 // The profiler is currently global for all threads. It can be changed to a | |
| 39 // per threads profiler by keeping a more elaborate data structure and calling | |
| 40 // iterate_since_last_scavenge at thread switches. | |
| 41 | |
| 42 | |
| 43 class AllocationProfiler: AllStatic { | |
| 44 friend class GenCollectedHeap; | |
| 342 | 45 friend class G1CollectedHeap; |
| 0 | 46 friend class MarkSweep; |
| 47 private: | |
| 48 static bool _active; // tells whether profiler is active | |
| 49 static GrowableArray<klassOop>* _print_array; // temporary array for printing | |
| 50 | |
| 51 // Utility printing functions | |
| 52 static void add_class_to_array(klassOop k); | |
| 53 static void add_classes_to_array(klassOop k); | |
| 54 static int compare_classes(klassOop* k1, klassOop* k2); | |
| 55 static int average(size_t alloc_size, int alloc_count); | |
| 56 static void sort_and_print_array(size_t cutoff); | |
| 57 | |
| 58 // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage. | |
| 59 static void iterate_since_last_gc(); | |
| 60 | |
| 61 public: | |
| 62 // Start profiler | |
| 63 static void engage(); | |
| 64 // Stop profiler | |
| 65 static void disengage(); | |
| 66 // Tells whether profiler is active | |
| 67 static bool is_active() { return _active; } | |
| 68 // Print profile | |
| 69 static void print(size_t cutoff); // Cutoff in total allocation size (in words) | |
| 70 }; | |
| 1972 | 71 |
| 72 #endif // SHARE_VM_RUNTIME_APROFILER_HPP |