From owner-freebsd-hackers  Sat Mar 24  5:42: 7 2001
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Date: Sat, 24 Mar 2001 14:41:50 +0100
From: Anton Berezin <tobez@tobez.org>
To: Adrian Chadd <adrian@FreeBSD.ORG>
Cc: Robert Watson <rwatson@FreeBSD.ORG>,
	"Alexey V. Neyman" <avn@any.ru>,
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Subject: Re: tuning a VERY heavily (30.0) loaded s cerver
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On Fri, Mar 23, 2001 at 08:11:03PM +0100, Adrian Chadd wrote:

> A while back I started running through the undocumented sysctls and
> documenting them. I didn't get through all of them, and the main reason
> I stopped was because there wasn't a nifty way to extract the sysctls
> short of writing a script to extract them from /usr/src.
> 
> Someone did point out that you could stuff the sysctl's into an elf
> segment and only load it when needed, but I don't know much about elf.
> If someone would like to do this, I'm sure a small group of us
> (Asmodai? :-P) could walk the sysctl tree again and figure out what
> the undocumented sysctls are. :-)

Some time ago I wrote such a script and even sent it to someone;  never
got any response, though.

It is pretty minimal but does the job.  I believe that the only sysctls
it misses are those which use auxilliary defines to minimize the number
of parameters (like #define P1B_SYSCTL in posix4/posix4_mib.c).

FWIW, the script is attached.

Cheers,
&Anton.
-- 
May the tuna salad be with you.

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#! /usr/bin/perl -w

use File::Find;
use Text::ParseWords;

sub check_file
{
   return unless /\.c$/ && -r;
   local $/;
   open SRC, "< $_"
      or print( "can't open $File::Find::dir: $!"), return;
   my $src = <SRC>; # memory hog
   close SRC;
   my @found = ($src =~ /\nSYSCTL_(\w+\([^()]+\))/sg);
   return unless @found;
   print "$File::Find::dir/$_:\n";
   for (@found) {
      tr/\n\t /   /s;
      my ($type) = /^(\w+)\(/;
      next if $type eq "DECL";
      s/^.*\(//; s/\)//; 
      my @args = quotewords ',', 1, $_;
      #print "|@args|\n";
      $args[0] =~ s/^\s*_//;
      $args[0] =~ s/\s+$//;
      $args[0] =~ tr/_/./;
      $args[2] =~ s/^\s+//;
      $args[2] =~ s/\s+$//;
      print "$type\t$args[0].$args[2]\t$args[-1]\n"; 
   }
}

find( \&check_file, '/usr/src/sys');

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