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      1 #!/usr/sbin/dtrace -Zs
      2 /*
      3  * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  *   - Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  *
     12  *   - Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  *
     16  *   - Neither the name of Oracle nor the names of its
     17  *     contributors may be used to endorse or promote products derived
     18  *     from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     21  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34 */
     35 
     36 /*
     37  * Usage:
     38  *   1. monitors.d -c "java ..."
     39  *   2. monitors.d -p JAVA_PID
     40  *
     41  * The script traces monitor related probes.
     42  *
     43  * Notes:
     44  *  - These probes are disabled by default since it incurs performance
     45  *    overhead to the application. To trace the monitor-* probes, you need
     46  *    to turn on the ExtendedDTraceProbes VM option.
     47  *    You can either start the application with -XX:+ExtendedDTraceProbes
     48  *    option or use the jinfo command to enable it at runtime as follows:
     49  *
     50  *       jinfo -flag +ExtendedDTraceProbes <java_pid>
     51  *
     52  */
     53 
     54 #pragma D option quiet
     55 #pragma D option destructive
     56 #pragma D option defaultargs
     57 #pragma D option aggrate=100ms
     58 
     59 
     60 self string thread_name;
     61 self char* str_ptr;
     62 
     63 :::BEGIN
     64 {
     65     SAMPLE_NAME = "hotspot monitors tracing";
     66 
     67     printf("BEGIN %s\n\n", SAMPLE_NAME);
     68 }
     69 
     70 /*
     71  * hotspot:::thread-start, hotspot:::thread-stop probe arguments:
     72  *  arg0: char*,        thread name passed as mUTF8 string
     73  *  arg1: uintptr_t,    thread name length
     74  *  arg2: uintptr_t,    Java thread id
     75  *  arg3: uintptr_t,    native/OS thread id
     76  *  arg4: uintptr_t,    is a daemon or not
     77  */
     78 hotspot$target:::thread-start
     79 {
     80     self->str_ptr = (char*) copyin(arg0, arg1+1);
     81     self->str_ptr[arg1] = '\0';
     82     self->thread_name = (string) self->str_ptr;
     83 
     84     printf("thread-start: id=%d, is_daemon=%d, name=%s, os_id=%d\n",
     85             arg2, arg4, self->thread_name, arg3);
     86 
     87     threads[arg2] = self->thread_name;
     88 }
     89 
     90 
     91 hotspot$target:::thread-stop
     92 {
     93     self->str_ptr = (char*) copyin(arg0, arg1+1);
     94     self->str_ptr[arg1] = '\0';
     95     self->thread_name = (string) self->str_ptr;
     96 
     97 
     98     printf("thread-stop: id=%d, is_daemon=%d, name=%s, os_id=%d\n",
     99             arg2, arg4, self->thread_name, arg3);
    100 }
    101 
    102 /*
    103  *
    104  * hotspot::monitor-contended-enter, hotspot::monitor-contended-entered
    105  *
    106  *  arg0: uintptr_t,    the Java thread identifier for the thread peforming
    107  *                          the monitor operation
    108  *  arg1: uintptr_t,    a unique, but opaque identifier for the specific
    109  *                          monitor that the action is performed upon
    110  *  arg2: char*,        a pointer to mUTF-8 string data which contains the
    111  *                          name of the class of the object being acted upon
    112  *  arg3: uintptr_t,    the length of the class name (in bytes)
    113  */
    114 
    115 hotspot$target:::monitor-contended-enter
    116 {
    117     /* (uintptr_t thread_id, uintptr_t monitor_id,
    118        char* obj_class_name, uintptr_t obj_class_name_len) */
    119 
    120     self->str_ptr = (char*) copyin(arg2, arg3+1);
    121     self->str_ptr[arg3] = '\0';
    122     self->class_name = (string) self->str_ptr;
    123 
    124     monitors[arg1] = self->class_name;
    125 
    126     monitors_enter[arg1] = arg0;
    127     printf("%s: -> enter monitor (%d) %s\n",
    128         threads[arg0], arg1, monitors[arg1]);
    129 }
    130 
    131 hotspot$target:::monitor-contended-entered
    132 {
    133     /* (uintptr_t thread_id, uintptr_t monitor_id, char* obj_class_name,
    134         uintptr_t obj_class_name_len) */
    135 
    136     monitors_entered[arg1] = arg0;
    137     printf("%s: <- entered monitor (%d) %s\n",
    138         threads[arg0], arg1, monitors[arg1]);
    139 }
    140 
    141 
    142 :::END
    143 {
    144     printf("\nEND of %s\n", SAMPLE_NAME);
    145 }
    146 
    147 syscall::rexit:entry,
    148 syscall::exit:entry
    149 /pid == $target/
    150 {
    151    exit(0);
    152 }
    153