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Date: Wed, 28 Jul 2004 18:13:45 -0400
From: Brian Fundakowski Feldman <green@FreeBSD.org>
To: Poul-Henning Kamp <phk@phk.freebsd.dk>
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cc: Marius Strobl <marius@alchemy.franken.de>
Subject: Re: cvs commit: src/usr.sbin/watchdogd watchdogd.c
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On Wed, Jul 28, 2004 at 11:16:21PM +0200, Poul-Henning Kamp wrote:
> In message <20040728233751.A31182@newtrinity.zeist.de>, Marius Strobl writes:
> >On Fri, Jul 23, 2004 at 03:24:58PM +0000, Brian Feldman wrote:
> >> green       2004-07-23 15:24:58 UTC
> >> 
> >>   FreeBSD src repository
> >> 
> >>   Modified files:
> >>     usr.sbin/watchdogd   watchdogd.c 
> >>   Log:
> >>   Now that mlockall(2) is unbroken, use it to keep watchdogd(8) permanently
> >>   out of swap.
> >>   
> >
> >This broke watchdogd(8) on at least alpha and sparc64:
> >omega# watchdogd
> >watchdogd: mlockall: Resource temporarily unavailable
> >
> >Like I told you before, every call of mlockall(MCL_CURRENT) returns -1
> >and sets errno to EAGAIN on these platforms.
> 
> Worse, if it had worked it would have prevented watchdogd from
> detecting swap disk related issues.
> 
> The only kind of special treatment you should give a watchdog daemons
> is negative benefits so that it will be more sensitive to trouble.

The usage of real-time priority isn't really much of a negative benefit,
either, though.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\