Mercurial > hg > graal-jvmci-8
view src/share/vm/utilities/events.hpp @ 1837:c99c53f07c14
6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam
author | ysr |
---|---|
date | Wed, 29 Sep 2010 16:17:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 1997, 2003, 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. * */ // Events and EventMark provide interfaces to log events taking place in the vm. // This facility is extremly useful for post-mortem debugging. The eventlog // often provides crucial information about events leading up to the crash. // // All arguments past the format string must be passed as an intptr_t. // // To log a single event use: // Events::log("New nmethod has been created " INTPTR_FORMAT, nm); // // To log a block of events use: // EventMark m("GarbageCollecting %d", (intptr_t)gc_number); // // The constructor to eventlog indents the eventlog until the // destructor has been executed. // // IMPLEMENTATION RESTRICTION: // Max 3 arguments are saved for each logged event. // class Events : AllStatic { public: // Logs an event, format as printf static void log(const char* format, ...) PRODUCT_RETURN; // Prints all events in the buffer static void print_all(outputStream* st) PRODUCT_RETURN; // Prints last number events from the event buffer static void print_last(outputStream *st, int number) PRODUCT_RETURN; }; class EventMark : public StackObj { public: // log a begin event, format as printf EventMark(const char* format, ...) PRODUCT_RETURN; // log an end event ~EventMark() PRODUCT_RETURN; }; int print_all_events(outputStream *st);