diff options
Diffstat (limited to 'sys/compat/linux/stats_timing.d')
| -rw-r--r-- | sys/compat/linux/stats_timing.d | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/sys/compat/linux/stats_timing.d b/sys/compat/linux/stats_timing.d new file mode 100644 index 000000000000..66a813a9af92 --- /dev/null +++ b/sys/compat/linux/stats_timing.d @@ -0,0 +1,93 @@ +#!/usr/sbin/dtrace -qs + +/*- + * Copyright (c) 2008-2012 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. + * + * $FreeBSD$ + */ + +/** + * Some statistics (all per provider): + * - number of calls to a function per executable binary (not per PID!) + * - allows to see where an optimization would be beneficial for a given + * application + * - graph of CPU time spend in functions per executable binary + * - together with the number of calls to this function this allows + * to determine if a kernel optimization would be beneficial / is + * possible for a given application + * - graph of longest running (CPU-time!) function in total + * - may help finding problem cases in the kernel code + * - graph of longest held (CPU-time!) locks + */ + +#pragma D option dynvarsize=32m + +linuxulator*:::entry +{ + self->time[probefunc] = vtimestamp; + @calls[probeprov, execname, probefunc] = count(); +} + +linuxulator*:::return +/self->time[probefunc] != 0/ +{ + this->timediff = self->time[probefunc] - vtimestamp; + + @stats[probeprov, execname, probefunc] = quantize(this->timediff); + @longest[probeprov, probefunc] = max(this->timediff); + + self->time[probefunc] = 0; +} + +linuxulator*:::locked +{ + self->lock[arg0] = vtimestamp; +} + +linuxulator*:::unlock +/self->lock[arg0] != 0/ +{ + this->timediff = self->lock[arg0] - vtimestamp; + + @lockstats[probefunc] = quantize(this->timediff); + @longlock[probefunc] = max(this->timediff); + + self->lock[arg0] = 0; +} + +END +{ + printf("Number of calls per provider/application/kernel function:"); + printa(@calls); + printf("CPU-timing statistics per provider/application/kernel function (in ns):"); + printa(@stats); + printf("Longest running (CPU-time!) functions per provider (in ns):"); + printa(@longest); + printf("Lock CPU-timing statistics:"); + printa(@lockstats); + printf("Longest running (CPU-time!) locks:"); + printa(@longlock); +} + |