J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | #!/usr/sbin/dtrace -Zs |
| 2 | |
| 3 | /* |
| 4 | * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * |
| 10 | * - Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * |
| 13 | * - Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * - Neither the name of Sun Microsystems nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 22 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 23 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 25 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 26 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 27 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 28 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | */ |
| 36 | |
| 37 | /* |
| 38 | * Usage: |
| 39 | * 1. CriticalSection_slow.d -c "java ..." |
| 40 | * 2. CriticalSection_slow.d -p JAVA_PID |
| 41 | * |
| 42 | * The script inspect a JNI application for Critical Section violations. |
| 43 | * |
| 44 | * Critical section is the space between calls to JNI methods: |
| 45 | * - GetPrimitiveArrayCritical and ReleasePrimitiveArrayCritical; or |
| 46 | * - GetStringCritical and ReleaseStringCritical. |
| 47 | * |
| 48 | * Inside a critical section, native code must not call other JNI functions, |
| 49 | * or any system call that may cause the current thread to block and wait |
| 50 | * for another Java thread. (For example, the current thread must not call |
| 51 | * read on a stream being written by another Java thread.) |
| 52 | * |
| 53 | */ |
| 54 | |
| 55 | #pragma D option quiet |
| 56 | #pragma D option destructive |
| 57 | #pragma D option defaultargs |
| 58 | #pragma D option bufsize=16m |
| 59 | #pragma D option aggrate=100ms |
| 60 | |
| 61 | |
| 62 | self int in_critical_section; |
| 63 | self string critical_section_name; |
| 64 | |
| 65 | self char *str_ptr; |
| 66 | self string class_name; |
| 67 | self string method_name; |
| 68 | self string signature; |
| 69 | |
| 70 | self int indent; |
| 71 | self int JAVA_STACK_DEEP; |
| 72 | |
| 73 | int CRITICAL_SECTION_VIOLATION_CNT; |
| 74 | |
| 75 | :::BEGIN |
| 76 | { |
| 77 | SAMPLE_NAME = "critical section violation checks"; |
| 78 | |
| 79 | printf("BEGIN %s\n", SAMPLE_NAME); |
| 80 | } |
| 81 | |
| 82 | hotspot$target:::* |
| 83 | /!self->JAVA_STACK_DEEP/ |
| 84 | { |
| 85 | self->JAVA_STACK_DEEP = 0; |
| 86 | } |
| 87 | |
| 88 | |
| 89 | hotspot$target:::method-return |
| 90 | /self->JAVA_STACK_DEEP > 0/ |
| 91 | { |
| 92 | self->JAVA_STACK_DEEP --; |
| 93 | } |
| 94 | |
| 95 | hotspot$target:::method-entry |
| 96 | { |
| 97 | self->JAVA_STACK_DEEP ++; |
| 98 | |
| 99 | self->str_ptr = (char*) copyin(arg1, arg2+1); |
| 100 | self->str_ptr[arg2] = '\0'; |
| 101 | self->method_name = strjoin( (string) self->str_ptr, ":"); |
| 102 | |
| 103 | self->str_ptr = (char*) copyin(arg3, arg4+1); |
| 104 | self->str_ptr[arg4] = '\0'; |
| 105 | self->method_name = strjoin(self->method_name, (string) self->str_ptr); |
| 106 | self->method_name = strjoin(self->method_name, ":"); |
| 107 | |
| 108 | self->str_ptr = (char*) copyin(arg5, arg6+1); |
| 109 | self->str_ptr[arg6] = '\0'; |
| 110 | self->method_name = strjoin(self->method_name, (string) self->str_ptr); |
| 111 | |
| 112 | self->JAVA_STACK[self->JAVA_STACK_DEEP] = self->method_name; |
| 113 | |
| 114 | /* printf("%-10u%*s%s\n", |
| 115 | * curcpu->cpu_id, self->indent, "", self->method_name); |
| 116 | */ |
| 117 | } |
| 118 | |
| 119 | |
| 120 | /* |
| 121 | * Multiple pairs of GetPrimitiveArrayCritical/ReleasePrimitiveArrayCritical, |
| 122 | * GetStringCritical/ReleaseStringCritical may be nested |
| 123 | */ |
| 124 | hotspot_jni$target:::*_entry |
| 125 | /self->in_critical_section > 0 && |
| 126 | probename != "GetPrimitiveArrayCritical_entry" && |
| 127 | probename != "GetStringCritical_entry" && |
| 128 | probename != "ReleasePrimitiveArrayCritical_entry" && |
| 129 | probename != "ReleaseStringCritical_entry" && |
| 130 | probename != "GetPrimitiveArrayCritical_return" && |
| 131 | probename != "GetStringCritical_return" && |
| 132 | probename != "ReleasePrimitiveArrayCritical_return" && |
| 133 | probename != "ReleaseStringCritical_return"/ |
| 134 | { |
| 135 | printf("JNI call %s made from JNI critical region '%s' from %s\n", |
| 136 | probename, self->critical_section_name, |
| 137 | self->JAVA_STACK[self->JAVA_STACK_DEEP]); |
| 138 | |
| 139 | CRITICAL_SECTION_VIOLATION_CNT ++; |
| 140 | } |
| 141 | |
| 142 | syscall:::entry |
| 143 | /pid == $target && self->in_critical_section > 0/ |
| 144 | { |
| 145 | printf("system call %s made in JNI critical region '%s' from %s\n", |
| 146 | probefunc, self->critical_section_name, |
| 147 | self->JAVA_STACK[self->JAVA_STACK_DEEP]); |
| 148 | |
| 149 | CRITICAL_SECTION_VIOLATION_CNT ++; |
| 150 | } |
| 151 | |
| 152 | hotspot_jni$target:::ReleasePrimitiveArrayCritical_entry, |
| 153 | hotspot_jni$target:::ReleaseStringCritical_entry |
| 154 | /self->in_critical_section > 0/ |
| 155 | { |
| 156 | self->in_critical_section --; |
| 157 | } |
| 158 | |
| 159 | hotspot_jni$target:::GetPrimitiveArrayCritical_return |
| 160 | { |
| 161 | self->in_critical_section ++; |
| 162 | self->critical_section_name = "GetPrimitiveArrayCritical"; |
| 163 | } |
| 164 | |
| 165 | hotspot_jni$target:::GetStringCritical_return |
| 166 | { |
| 167 | self->in_critical_section ++; |
| 168 | self->critical_section_name = "GetStringCritical"; |
| 169 | } |
| 170 | |
| 171 | |
| 172 | :::END |
| 173 | { |
| 174 | printf("%d critical section violations have been discovered\n", |
| 175 | CRITICAL_SECTION_VIOLATION_CNT); |
| 176 | |
| 177 | printf("\nEND of %s\n", SAMPLE_NAME); |
| 178 | } |