jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp@06df86c2ec37 (annotated)

src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp@06df86c2ec37 (annotated)

src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp

Sat, 27 Sep 2008 00:33:13 -0700

author: iveresov
date: Sat, 27 Sep 2008 00:33:13 -0700
changeset 808: 06df86c2ec37
parent 777: 37f87013dfd8
permissions: -rw-r--r--

6740923: NUMA allocator: Ensure the progress of adaptive chunk resizing
Summary: Treat a chuck where the allocation has failed as fully used.
Reviewed-by: ysr

 /*
  * 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();
 };

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src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp@06df86c2ec37 (annotated)

src/share/vm/gc_implementation/shared/gcOverheadReporter.hpp