Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp @ 665:c89f86385056
6814659: separable cleanups and subroutines for 6655638
Summary: preparatory but separable changes for method handles
Reviewed-by: kvn, never
author | jrose |
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date | Fri, 20 Mar 2009 23:19:36 -0700 |
parents | 37f87013dfd8 |
children |
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/* * Copyright 2001-2007 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. * */ // Keeps track of the GC overhead (both concurrent and STW). It stores // it in a large array and then prints it to tty at the end of the // execution. // See coTracker.hpp for the explanation on what groups are. // Let's set a maximum number of concurrent overhead groups, to // statically allocate any arrays we need and not to have to // malloc/free them. This is just a bit more convenient. enum { MaxGCOverheadGroupNum = 4 }; typedef struct { double _start_sec; double _end_sec; double _conc_overhead[MaxGCOverheadGroupNum]; double _stw_overhead; } GCOverheadReporterEntry; class GCOverheadReporter { friend class COReportingThread; private: enum PrivateConstants { DefaultReporterLength = 128 * 1024 }; // Reference to the single instance of this class. static GCOverheadReporter* _reporter; // These three references point to the array that contains the GC // overhead entries (_base is the base of the array, _top is the // address passed the last entry of the array, _curr is the next // entry to be used). GCOverheadReporterEntry* _base; GCOverheadReporterEntry* _top; GCOverheadReporterEntry* _curr; // The number of concurrent overhead groups. size_t _group_num; // The wall-clock time of the end of the last recorded period of GC // overhead. double _prev_end_sec; // Names for the concurrent overhead groups. const char* _group_names[MaxGCOverheadGroupNum]; // Add a new entry to the large array. conc_overhead being NULL is // equivalent to an array full of 0.0s. conc_overhead should have a // length of at least _group_num. void add(double start_sec, double end_sec, double* conc_overhead, double stw_overhead); // Add an entry that represents concurrent GC overhead. // conc_overhead must be at least of length _group_num. // conc_overhead being NULL is equivalent to an array full of 0.0s. void add_conc_overhead(double start_sec, double end_sec, double* conc_overhead) { add(start_sec, end_sec, conc_overhead, 0.0); } // Add an entry that represents STW GC overhead. void add_stw_overhead(double start_sec, double end_sec, double stw_overhead) { add(start_sec, end_sec, NULL, stw_overhead); } // It records the start of a STW pause (i.e. it records the // concurrent overhead up to that point) void record_stw_start(double start_sec); // It records the end of a STW pause (i.e. it records the overhead // associated with the pause and adjusts all the trackers to reflect // the pause) void record_stw_end(double end_sec); // It queries all the trackers of their concurrent overhead and // records it. void collect_and_record_conc_overhead(double end_sec); // It prints the contents of the GC overhead array void print() const; // Constructor. The same preconditions for group_num and group_names // from initGCOverheadReporter apply here too. GCOverheadReporter(size_t group_num, const char* group_names[], size_t length = DefaultReporterLength); public: // statics // It initialises the GCOverheadReporter and launches the concurrent // overhead reporting thread. Both actions happen only if the // GCOverheadReporting parameter is set. The length of the // group_names array should be >= group_num and group_num should be // <= MaxGCOverheadGroupNum. Entries group_namnes[0..group_num-1] // should not be NULL. static void initGCOverheadReporter(size_t group_num, const char* group_names[]); // The following three are provided for convenience and they are // wrappers around record_stw_start(start_sec), record_stw_end(end_sec), // and print(). Each of these checks whether GC overhead reporting // is on (i.e. _reporter != NULL) and, if it is, calls the // corresponding method. Saves from repeating this pattern again and // again from the places where they need to be called. static void recordSTWStart(double start_sec); static void recordSTWEnd(double end_sec); static void printGCOverhead(); };