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Replace DTrace sample with a premissive license
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#!/usr/sbin/dtrace -qs | ||
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// Source: https://github.com/bycn82/freebsd/blob/12a4a4a008eac3cfa71e496b33eaeaf426c374c1/sys/compat/linux/trace_futexes.d | ||
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/*- | ||
* Copyright (c) 2011-2012 Alexander Leidinger <netchild@FreeBSD.org> | ||
* All rights reserved. | ||
* | ||
* Redistribution and use in source and binary forms, with or without | ||
* modification, are permitted provided that the following conditions | ||
* are met: | ||
* 1. Redistributions of source code must retain the above copyright | ||
* notice, this list of conditions and the following disclaimer | ||
* in this position and unchanged. | ||
* 2. Redistributions in binary form must reproduce the above copyright | ||
* notice, this list of conditions and the following disclaimer in the | ||
* documentation and/or other materials provided with the distribution. | ||
* | ||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | ||
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | ||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | ||
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | ||
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
* | ||
* $FreeBSD$ | ||
*/ | ||
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/** | ||
* Trace futex operations: | ||
* - internal locks | ||
* - size of the futex list | ||
* - report error conditions (emulation errors, kernel errors, | ||
* programming errors) | ||
* - execution time (wallclock) of futex related functions | ||
*/ | ||
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#pragma D option specsize=32m | ||
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/* Error conditions */ | ||
linuxulator*:futex:futex_get:error, | ||
linuxulator*:futex:futex_sleep:requeue_error, | ||
linuxulator*:futex:futex_sleep:sleep_error, | ||
linuxulator*:futex:futex_wait:copyin_error, | ||
linuxulator*:futex:futex_wait:itimerfix_error, | ||
linuxulator*:futex:futex_wait:sleep_error, | ||
linuxulator*:futex:futex_atomic_op:missing_access_check, | ||
linuxulator*:futex:futex_atomic_op:unimplemented_op, | ||
linuxulator*:futex:futex_atomic_op:unimplemented_cmp, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_clockswitch, | ||
linuxulator*:futex:linux_sys_futex:copyin_error, | ||
linuxulator*:futex:linux_sys_futex:unhandled_efault, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_lock_pi, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_unlock_pi, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_trylock_pi, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_wait_requeue_pi, | ||
linuxulator*:futex:linux_sys_futex:unimplemented_cmp_requeue_pi, | ||
linuxulator*:futex:linux_sys_futex:unknown_operation, | ||
linuxulator*:futex:linux_get_robust_list:copyout_error, | ||
linuxulator*:futex:handle_futex_death:copyin_error, | ||
linuxulator*:futex:fetch_robust_entry:copyin_error, | ||
linuxulator*:futex:release_futexes:copyin_error | ||
{ | ||
printf("ERROR: %s in %s:%s:%s\n", probename, probeprov, probemod, | ||
probefunc); | ||
stack(); | ||
ustack(); | ||
} | ||
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linuxulator*:futex:linux_sys_futex:invalid_cmp_requeue_use, | ||
linuxulator*:futex:linux_sys_futex:deprecated_requeue, | ||
linuxulator*:futex:linux_set_robust_list:size_error | ||
{ | ||
printf("WARNING: %s:%s:%s:%s in application %s, maybe an application error?\n", | ||
probename, probeprov, probemod, probefunc, execname); | ||
stack(); | ||
ustack(); | ||
} | ||
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/* Per futex checks/statistics */ | ||
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linuxulator*:futex:futex:create | ||
{ | ||
++futex_count; | ||
@max_futexes = max(futex_count); | ||
} | ||
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linuxulator*:futex:futex:destroy | ||
/futex_count == 0/ | ||
{ | ||
printf("ERROR: Request to destroy a futex which was not created,\n"); | ||
printf(" or this script was started after some futexes where\n"); | ||
printf(" created. Stack trace:\n"); | ||
stack(); | ||
ustack(); | ||
} | ||
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linuxulator*:futex:futex:destroy | ||
{ | ||
--futex_count; | ||
} | ||
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/* Internal locks */ | ||
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linuxulator*:locks:futex_mtx:locked | ||
{ | ||
++check[probefunc, arg0]; | ||
@stats[probefunc] = count(); | ||
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ts[probefunc] = timestamp; | ||
spec[probefunc] = speculation(); | ||
printf("Stacktrace of last lock operation of the %s:\n", probefunc); | ||
stack(); | ||
} | ||
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linuxulator*:locks:futex_mtx:unlock | ||
/check[probefunc, arg0] == 0/ | ||
{ | ||
printf("ERROR: unlock attempt of unlocked %s (%p),", probefunc, arg0); | ||
printf(" missing SDT probe in kernel, or dtrace program started"); | ||
printf(" while the %s was already held (race condition).", probefunc); | ||
printf(" Stack trace follows:"); | ||
stack(); | ||
} | ||
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linuxulator*:locks:futex_mtx:unlock | ||
{ | ||
discard(spec[probefunc]); | ||
spec[probefunc] = 0; | ||
--check[probefunc, arg0]; | ||
} | ||
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/* Timeout handling for internal locks */ | ||
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tick-10s | ||
/spec["futex_mtx"] != 0 && timestamp - ts["futex_mtx"] >= 9999999000/ | ||
{ | ||
commit(spec["futex_mtx"]); | ||
spec["futex_mtx"] = 0; | ||
} | ||
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/* Timing statistings */ | ||
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linuxulator*:futex::entry | ||
{ | ||
self->time[probefunc] = timestamp; | ||
@calls[probeprov, execname, probefunc] = count(); | ||
} | ||
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linuxulator*:futex::return | ||
/self->time[probefunc] != 0/ | ||
{ | ||
this->timediff = self->time[probefunc] - timestamp; | ||
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@timestats[probeprov, execname, probefunc] = quantize(this->timediff); | ||
@longest[probeprov, probefunc] = max(this->timediff); | ||
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self->time[probefunc] = 0; | ||
} | ||
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/* Statistics */ | ||
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END | ||
{ | ||
printf("Number of locks per type:"); | ||
printa(@stats); | ||
printf("Number of maximum number of futexes in the futex list:"); | ||
printa(@max_futexes); | ||
printf("Number of futexes still existing: %d", futex_count); | ||
printf("Number of calls per provider/application/kernel function:"); | ||
printa(@calls); | ||
printf("Wallclock-timing statistics per provider/application/kernel function (in ns):"); | ||
printa(@timestats); | ||
printf("Longest running (wallclock!) functions per provider (in ns):"); | ||
printa(@longest); | ||
} |