Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/utilities/events.hpp@c96030fff130 (annotated)
src/share/vm/utilities/events.hpp
Thu, 20 Nov 2008 16:56:09 -0800
- author
- ysr
- date
- Thu, 20 Nov 2008 16:56:09 -0800
- changeset 888
- c96030fff130
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
| duke@435 | 1 | /* |
| duke@435 | 2 | * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| duke@435 | 21 | * have any questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| duke@435 | 25 | // Events and EventMark provide interfaces to log events taking place in the vm. |
| duke@435 | 26 | // This facility is extremly useful for post-mortem debugging. The eventlog |
| duke@435 | 27 | // often provides crucial information about events leading up to the crash. |
| duke@435 | 28 | // |
| duke@435 | 29 | // All arguments past the format string must be passed as an intptr_t. |
| duke@435 | 30 | // |
| duke@435 | 31 | // To log a single event use: |
| duke@435 | 32 | // Events::log("New nmethod has been created " INTPTR_FORMAT, nm); |
| duke@435 | 33 | // |
| duke@435 | 34 | // To log a block of events use: |
| duke@435 | 35 | // EventMark m("GarbageCollecting %d", (intptr_t)gc_number); |
| duke@435 | 36 | // |
| duke@435 | 37 | // The constructor to eventlog indents the eventlog until the |
| duke@435 | 38 | // destructor has been executed. |
| duke@435 | 39 | // |
| duke@435 | 40 | // IMPLEMENTATION RESTRICTION: |
| duke@435 | 41 | // Max 3 arguments are saved for each logged event. |
| duke@435 | 42 | // |
| duke@435 | 43 | |
| duke@435 | 44 | class Events : AllStatic { |
| duke@435 | 45 | public: |
| duke@435 | 46 | // Logs an event, format as printf |
| duke@435 | 47 | static void log(const char* format, ...) PRODUCT_RETURN; |
| duke@435 | 48 | |
| duke@435 | 49 | // Prints all events in the buffer |
| duke@435 | 50 | static void print_all(outputStream* st) PRODUCT_RETURN; |
| duke@435 | 51 | |
| duke@435 | 52 | // Prints last number events from the event buffer |
| duke@435 | 53 | static void print_last(outputStream *st, int number) PRODUCT_RETURN; |
| duke@435 | 54 | }; |
| duke@435 | 55 | |
| duke@435 | 56 | class EventMark : public StackObj { |
| duke@435 | 57 | public: |
| duke@435 | 58 | // log a begin event, format as printf |
| duke@435 | 59 | EventMark(const char* format, ...) PRODUCT_RETURN; |
| duke@435 | 60 | // log an end event |
| duke@435 | 61 | ~EventMark() PRODUCT_RETURN; |
| duke@435 | 62 | }; |
| duke@435 | 63 | |
| duke@435 | 64 | int print_all_events(outputStream *st); |
