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


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

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    1 #!/usr/sbin/dtrace -qs
    2 
    3 /*-
    4  * Copyright (c) 2008-2012 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/10.2/sys/compat/linux/stats_timing.d 235063 2012-05-05 19:42:38Z netchild $
   29  */
   30 
   31 /**
   32  * Some statistics (all per provider):
   33  *  - number of calls to a function per executable binary (not per PID!)
   34  *    - allows to see where an optimization would be beneficial for a given
   35  *      application
   36  *  - graph of CPU time spend in functions per executable binary
   37  *    - together with the number of calls to this function this allows
   38  *      to determine if a kernel optimization would be beneficial / is
   39  *      possible for a given application
   40  *  - graph of longest running (CPU-time!) function in total
   41  *    - may help finding problem cases in the kernel code
   42  * - timing statistics for the emul_lock
   43  * - graph of longest held (CPU-time!) locks
   44  */
   45 
   46 #pragma D option dynvarsize=32m
   47 
   48 linuxulator*:::entry
   49 {
   50         self->time[probefunc] = vtimestamp;
   51         @calls[probeprov, execname, probefunc] = count();
   52 }
   53 
   54 linuxulator*:::return
   55 /self->time[probefunc] != 0/
   56 {
   57         this->timediff = self->time[probefunc] - vtimestamp;
   58 
   59         @stats[probeprov, execname, probefunc] = quantize(this->timediff);
   60         @longest[probeprov, probefunc] = max(this->timediff);
   61         
   62         self->time[probefunc] = 0;
   63 }
   64 
   65 linuxulator*:::locked
   66 {
   67         self->lock[arg0] = vtimestamp;
   68 }
   69 
   70 linuxulator*:::unlock
   71 /self->lock[arg0] != 0/
   72 {
   73         this->timediff = self->lock[arg0] - vtimestamp;
   74 
   75         @lockstats[probefunc] = quantize(this->timediff);
   76         @longlock[probefunc] = max(this->timediff);
   77 
   78         self->lock[arg0] = 0;
   79 }
   80 
   81 END
   82 {
   83         printf("Number of calls per provider/application/kernel function:");
   84         printa(@calls);
   85         printf("CPU-timing statistics per provider/application/kernel function (in ns):");
   86         printa(@stats);
   87         printf("Longest running (CPU-time!) functions per provider (in ns):");
   88         printa(@longest);
   89         printf("Lock CPU-timing statistics:");
   90         printa(@lockstats);
   91         printf("Longest running (CPU-time!) locks:");
   92         printa(@longlock);
   93 }
   94 

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