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/gcTraceTime.hpp"

    28 #include "runtime/globals.hpp"

    29 #include "runtime/os.hpp"

    30 #include "runtime/safepoint.hpp"

    31 #include "runtime/thread.inline.hpp"

    32 #include "runtime/timer.hpp"

    33 #include "utilities/ostream.hpp"

    34 

    35 

    36 GCTraceTime::GCTraceTime(const char* title, bool doit, bool print_cr, GCTimer* timer) :

    37     _title(title), _doit(doit), _print_cr(print_cr), _timer(timer) {

    38   if (_doit || _timer != NULL) {

    39     _start_counter = os::elapsed_counter();

    40   }

    41 

    42   if (_timer != NULL) {

    43     assert(SafepointSynchronize::is_at_safepoint(), "Tracing currently only supported at safepoints");

    44     assert(Thread::current()->is_VM_thread(), "Tracing currently only supported from the VM thread");

    45 

    46     _timer->register_gc_phase_start(title, _start_counter);

    47   }

    48 

    49   if (_doit) {

    50     if (PrintGCTimeStamps) {

    51       gclog_or_tty->stamp();

    52       gclog_or_tty->print(": ");

    53     }

    54     gclog_or_tty->print("[%s", title);

    55     gclog_or_tty->flush();

    56   }

    57 }

    58 

    59 GCTraceTime::~GCTraceTime() {

    60   jlong stop_counter = 0;

    61 

    62   if (_doit || _timer != NULL) {

    63     stop_counter = os::elapsed_counter();

    64   }

    65 

    66   if (_timer != NULL) {

    67     _timer->register_gc_phase_end(stop_counter);

    68   }

    69 

    70   if (_doit) {

    71     double seconds = TimeHelper::counter_to_seconds(stop_counter - _start_counter);

    72     if (_print_cr) {

    73       gclog_or_tty->print_cr(", %3.7f secs]", seconds);

    74     } else {

    75       gclog_or_tty->print(", %3.7f secs]", seconds);

    76     }

    77     gclog_or_tty->flush();

    78   }

    79 }