From owner-freebsd-hackers  Tue Sep 10 01:42:14 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.5/8.7.3) id BAA01047
          for hackers-outgoing; Tue, 10 Sep 1996 01:42:14 -0700 (PDT)
Received: from ns.pa-consulting.com (ns.pa-consulting.com [193.118.224.1])
          by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id BAA01042
          for <freebsd-hackers@freebsd.org>; Tue, 10 Sep 1996 01:42:09 -0700 (PDT)
Received: from SMTPGATE.PA-CONSULTING.COM by ns.pa-consulting.com (8.6.4) id JAA00457; Tue, 10 Sep 1996 09:52:05 +0100
Received: by SMTPGATE.PA-CONSULTING.COM with Microsoft Mail
	id <32359D17@SMTPGATE.PA-CONSULTING.COM>; Tue, 10 Sep 96 09:53:43 PDT
From: Duncan Barclay <Duncan.Barclay@pa-consulting.com>
To: freebsd-hackers <freebsd-hackers@freebsd.org>
Subject: undocumented kernel priority changing
Date: Tue, 10 Sep 96 09:41:00 PDT
Message-ID: <32359D17@SMTPGATE.PA-CONSULTING.COM>
Encoding: 36 TEXT
X-Mailer: Microsoft Mail V3.0
Sender: owner-hackers@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk


Hi

Does anyone know why the following is not documented (either in the
nice, renice, or getrlimit pages, and not in the 4.4 "daemon" book)

in kern_synch.c (2.1.0R, havent had time to put on 2.1.5R)
mi_switch()
...
     /*
         * Check if the process exceeds its cpu resource allocation.
         * If over max, kill it.  In any case, if it has run for more
         * than 10 minutes, reduce priority to give others a chance.
         */
      ...
                if (s > 10 * 60 && p->p_ucred->cr_uid && p->p_nice == NZERO) 
{
                        p->p_nice = NZERO + 4;
                        resetpriority(p);
                }
...

It took me a while to figure out what was nicing my processes (would you
believe it, one was an editor!). Whilst I acknowledge that a lot of people 
wont
see this happening it is rather annoying to have it and it being not
documented (unlesws I missed it).

Shoot me if you will but a couple of config options may not go amiss, at
least for single/few user sites. I will plonk them in sometime soon.

Cheers

Duncan Barclay