1 /*
   2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
   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  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "gc_implementation/shared/gcTimer.hpp"
  27 #include "gc_implementation/shared/gcTrace.hpp"
  28 #include "gc_implementation/shared/gcTraceTime.hpp"
  29 #include "runtime/globals.hpp"
  30 #include "runtime/os.hpp"
  31 #include "runtime/safepoint.hpp"
  32 #include "runtime/thread.inline.hpp"
  33 #include "runtime/timer.hpp"
  34 #include "utilities/ostream.hpp"
  35 #include "utilities/ticks.inline.hpp"
  36 
  37 
  38 GCTraceTime::GCTraceTime(const char* title, bool doit, bool print_cr, GCTimer* timer, GCId gc_id) :
  39     _title(title), _doit(doit), _print_cr(print_cr), _timer(timer), _start_counter() {
  40   if (_doit || _timer != NULL) {
  41     _start_counter.stamp();
  42   }
  43 
  44   if (_timer != NULL) {
  45     assert(SafepointSynchronize::is_at_safepoint(), "Tracing currently only supported at safepoints");
  46     assert(Thread::current()->is_VM_thread(), "Tracing currently only supported from the VM thread");
  47 
  48     _timer->register_gc_phase_start(title, _start_counter);
  49   }
  50 
  51   if (_doit) {
  52     if (PrintGCTimeStamps) {
  53       gclog_or_tty->stamp();
  54       gclog_or_tty->print(": ");
  55     }
  56     if (PrintGCID) {
  57       gclog_or_tty->print("#%u: ", gc_id.id());
  58     }
  59     gclog_or_tty->print("[%s", title);
  60     gclog_or_tty->flush();
  61   }
  62 }
  63 
  64 GCTraceTime::~GCTraceTime() {
  65   Ticks stop_counter;
  66 
  67   if (_doit || _timer != NULL) {
  68     stop_counter.stamp();
  69   }
  70 
  71   if (_timer != NULL) {
  72     _timer->register_gc_phase_end(stop_counter);
  73   }
  74 
  75   if (_doit) {
  76     const Tickspan duration = stop_counter - _start_counter;
  77     double duration_in_seconds = TicksToTimeHelper::seconds(duration);
  78     if (_print_cr) {
  79       gclog_or_tty->print_cr(", %3.7f secs]", duration_in_seconds);
  80     } else {
  81       gclog_or_tty->print(", %3.7f secs]", duration_in_seconds);
  82     }
  83     gclog_or_tty->flush();
  84   }
  85 }