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/11.2/sys/compat/linux/stats_timing.d 283383 2015-05-24 14:53:16Z dchagin $
   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  * - graph of longest held (CPU-time!) locks
   43  */
   44 
   45 #pragma D option dynvarsize=32m
   46 
   47 linuxulator*:::entry
   48 {
   49         self->time[probefunc] = vtimestamp;
   50         @calls[probeprov, execname, probefunc] = count();
   51 }
   52 
   53 linuxulator*:::return
   54 /self->time[probefunc] != 0/
   55 {
   56         this->timediff = self->time[probefunc] - vtimestamp;
   57 
   58         @stats[probeprov, execname, probefunc] = quantize(this->timediff);
   59         @longest[probeprov, probefunc] = max(this->timediff);
   60         
   61         self->time[probefunc] = 0;
   62 }
   63 
   64 linuxulator*:::locked
   65 {
   66         self->lock[arg0] = vtimestamp;
   67 }
   68 
   69 linuxulator*:::unlock
   70 /self->lock[arg0] != 0/
   71 {
   72         this->timediff = self->lock[arg0] - vtimestamp;
   73 
   74         @lockstats[probefunc] = quantize(this->timediff);
   75         @longlock[probefunc] = max(this->timediff);
   76 
   77         self->lock[arg0] = 0;
   78 }
   79 
   80 END
   81 {
   82         printf("Number of calls per provider/application/kernel function:");
   83         printa(@calls);
   84         printf("CPU-timing statistics per provider/application/kernel function (in ns):");
   85         printa(@stats);
   86         printf("Longest running (CPU-time!) functions per provider (in ns):");
   87         printa(@longest);
   88         printf("Lock CPU-timing statistics:");
   89         printa(@lockstats);
   90         printf("Longest running (CPU-time!) locks:");
   91         printa(@longlock);
   92 }
   93 

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