1 /*
   2  * Copyright (c) 2012, 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/gcTraceTime.hpp"
  28 #include "runtime/globals.hpp"
  29 #include "runtime/os.hpp"
  30 #include "runtime/safepoint.hpp"
  31 #include "runtime/timer.hpp"
  32 #include "utilities/ostream.hpp"
  33 #ifdef TARGET_OS_FAMILY_linux
  34 # include "thread_linux.inline.hpp"
  35 #endif
  36 #ifdef TARGET_OS_FAMILY_solaris
  37 # include "thread_solaris.inline.hpp"
  38 #endif
  39 #ifdef TARGET_OS_FAMILY_windows
  40 # include "thread_windows.inline.hpp"
  41 #endif
  42 #ifdef TARGET_OS_FAMILY_bsd
  43 # include "thread_bsd.inline.hpp"
  44 #endif
  45 
  46 
  47 GCTraceTime::GCTraceTime(const char* title, bool doit, bool print_cr, GCTimer* timer) :
  48     _title(title), _doit(doit), _print_cr(print_cr), _timer(timer) {
  49   if (_doit || _timer != NULL) {
  50     _start_counter = os::elapsed_counter();
  51   }
  52 
  53   if (_timer != NULL) {
  54     assert(SafepointSynchronize::is_at_safepoint(), "Tracing currently only supported at safepoints");
  55     assert(Thread::current()->is_VM_thread(), "Tracing currently only supported from the VM thread");
  56 
  57     _timer->register_gc_phase_start(title, _start_counter);
  58   }
  59 
  60   if (_doit) {
  61     gclog_or_tty->date_stamp(PrintGCDateStamps);
  62     gclog_or_tty->stamp(PrintGCTimeStamps);
  63     gclog_or_tty->print("[%s", title);
  64     gclog_or_tty->flush();
  65   }
  66 }
  67 
  68 GCTraceTime::~GCTraceTime() {
  69   jlong stop_counter = 0;
  70 
  71   if (_doit || _timer != NULL) {
  72     stop_counter = os::elapsed_counter();
  73   }
  74 
  75   if (_timer != NULL) {
  76     _timer->register_gc_phase_end(stop_counter);
  77   }
  78 
  79   if (_doit) {
  80     double seconds = TimeHelper::counter_to_seconds(stop_counter - _start_counter);
  81     if (_print_cr) {
  82       gclog_or_tty->print_cr(", %3.7f secs]", seconds);
  83     } else {
  84       gclog_or_tty->print(", %3.7f secs]", seconds);
  85     }
  86     gclog_or_tty->flush();
  87   }
  88 }