The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/trace_futexes.d

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 #!/usr/sbin/dtrace -qs
    2 
    3 /*-
    4  * Copyright (c) 2011-2012 Alexander Leidinger <netchild@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. 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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/11.2/sys/compat/linux/trace_futexes.d 298829 2016-04-30 00:53:10Z pfg $
   29  */
   30 
   31 /**
   32  * Trace futex operations:
   33  *  - internal locks
   34  *  - size of the futex list
   35  *  - report error conditions (emulation errors, kernel errors,
   36  *    programming errors)
   37  *  - execution time (wallclock) of futex related functions
   38  */
   39 
   40 #pragma D option specsize=32m
   41 
   42 /* Error conditions */
   43 linuxulator*:futex:futex_get:error,
   44 linuxulator*:futex:futex_sleep:requeue_error,
   45 linuxulator*:futex:futex_sleep:sleep_error,
   46 linuxulator*:futex:futex_wait:copyin_error,
   47 linuxulator*:futex:futex_wait:itimerfix_error,
   48 linuxulator*:futex:futex_wait:sleep_error,
   49 linuxulator*:futex:futex_atomic_op:missing_access_check,
   50 linuxulator*:futex:futex_atomic_op:unimplemented_op,
   51 linuxulator*:futex:futex_atomic_op:unimplemented_cmp,
   52 linuxulator*:futex:linux_sys_futex:unimplemented_clockswitch,
   53 linuxulator*:futex:linux_sys_futex:copyin_error,
   54 linuxulator*:futex:linux_sys_futex:unhandled_efault,
   55 linuxulator*:futex:linux_sys_futex:unimplemented_lock_pi,
   56 linuxulator*:futex:linux_sys_futex:unimplemented_unlock_pi,
   57 linuxulator*:futex:linux_sys_futex:unimplemented_trylock_pi,
   58 linuxulator*:futex:linux_sys_futex:unimplemented_wait_requeue_pi,
   59 linuxulator*:futex:linux_sys_futex:unimplemented_cmp_requeue_pi,
   60 linuxulator*:futex:linux_sys_futex:unknown_operation,
   61 linuxulator*:futex:linux_get_robust_list:copyout_error,
   62 linuxulator*:futex:handle_futex_death:copyin_error,
   63 linuxulator*:futex:fetch_robust_entry:copyin_error,
   64 linuxulator*:futex:release_futexes:copyin_error
   65 {
   66         printf("ERROR: %s in %s:%s:%s\n", probename, probeprov, probemod,
   67             probefunc);
   68         stack();
   69         ustack();
   70 }
   71 
   72 linuxulator*:futex:linux_sys_futex:invalid_cmp_requeue_use,
   73 linuxulator*:futex:linux_sys_futex:deprecated_requeue,
   74 linuxulator*:futex:linux_set_robust_list:size_error
   75 {
   76         printf("WARNING: %s:%s:%s:%s in application %s, maybe an application error?\n",
   77             probename, probeprov, probemod, probefunc, execname);
   78         stack();
   79         ustack();
   80 }
   81 
   82 
   83 /* Per futex checks/statistics */
   84 
   85 linuxulator*:futex:futex:create
   86 {
   87         ++futex_count;
   88         @max_futexes = max(futex_count);
   89 }
   90 
   91 linuxulator*:futex:futex:destroy
   92 /futex_count == 0/
   93 {
   94         printf("ERROR: Request to destroy a futex which was not created,\n");
   95         printf("       or this script was started after some futexes where\n");
   96         printf("       created. Stack trace:\n");
   97         stack();
   98         ustack();
   99 }
  100 
  101 linuxulator*:futex:futex:destroy
  102 {
  103         --futex_count;
  104 }
  105 
  106 
  107 /* Internal locks */
  108 
  109 linuxulator*:locks:futex_mtx:locked
  110 {
  111         ++check[probefunc, arg0];
  112         @stats[probefunc] = count();
  113 
  114         ts[probefunc] = timestamp;
  115         spec[probefunc] = speculation();
  116         printf("Stacktrace of last lock operation of the %s:\n", probefunc);
  117         stack();
  118 }
  119 
  120 linuxulator*:locks:futex_mtx:unlock
  121 /check[probefunc, arg0] == 0/
  122 {
  123         printf("ERROR: unlock attempt of unlocked %s (%p),", probefunc, arg0);
  124         printf("       missing SDT probe in kernel, or dtrace program started");
  125         printf("       while the %s was already held (race condition).", probefunc);
  126         printf("       Stack trace follows:");
  127         stack();
  128 }
  129 
  130 linuxulator*:locks:futex_mtx:unlock
  131 {
  132         discard(spec[probefunc]);
  133         spec[probefunc] = 0;
  134         --check[probefunc, arg0];
  135 }
  136 
  137 /* Timeout handling for internal locks */
  138 
  139 tick-10s
  140 /spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/
  141 {
  142         commit(spec["futex_mtx"]);
  143         spec["futex_mtx"] = 0;
  144 }
  145 
  146 
  147 /* Timing statistings */
  148 
  149 linuxulator*:futex::entry
  150 {
  151         self->time[probefunc] = timestamp;
  152         @calls[probeprov, execname, probefunc] = count();
  153 }
  154 
  155 linuxulator*:futex::return
  156 /self->time[probefunc] != 0/
  157 {
  158         this->timediff = self->time[probefunc] - timestamp;
  159 
  160         @timestats[probeprov, execname, probefunc] = quantize(this->timediff);
  161         @longest[probeprov, probefunc] = max(this->timediff);
  162 
  163         self->time[probefunc] = 0;
  164 }
  165 
  166 
  167 /* Statistics */
  168 
  169 END
  170 {
  171         printf("Number of locks per type:");
  172         printa(@stats);
  173         printf("Number of maximum number of futexes in the futex list:");
  174         printa(@max_futexes);
  175         printf("Number of futexes still existing: %d", futex_count);
  176         printf("Number of calls per provider/application/kernel function:");
  177         printa(@calls);
  178         printf("Wallclock-timing statistics per provider/application/kernel function (in ns):");
  179         printa(@timestats);
  180         printf("Longest running (wallclock!) functions per provider (in ns):");
  181         printa(@longest);
  182 }

Cache object: 52e45eb2fdca24c6e09014c68feca5a5


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.