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Date:      Wed, 26 Mar 2003 08:58:37 -0800
From:      Wes Peters <wes@softweyr.com>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        freebsd-arch@freebsd.org
Subject:   Re: Patch to protect process from pageout killing
Message-ID:  <200303260858.37039.wes@softweyr.com>
In-Reply-To: <XFMail.20030325113450.jhb@FreeBSD.org>
References:  <XFMail.20030325113450.jhb@FreeBSD.org>

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On Tuesday 25 March 2003 08:34, John Baldwin wrote:
> On 25-Mar-2003 Wes Peters wrote:
> > On Monday 24 March 2003 08:36, Poul-Henning Kamp wrote:
> >> Also, doesn't this result in the flag being inerited with fork() and
> >> thereby negating the effect you are seeking for squid ?
> >
> > I looked through all the places in kern_fork.c where p2->p_flag gets
> > set and didn't see anything that looked like it would inherit
> > P_PROTECTED from p1->p_flag.  Did I miss something?  I'm obviously a
> > bit of a neophyte in this part of the kernel.
>
> rlimit's are inherited.  However, due to a "feature" bug in your patch,
> the P_PROTECTED flag doesn't get turned on when the rlimit is inherited
> in fork1().

feature bug?  If you mean the fact that the setting for P_PROTECTED isn't 
stored in the rlimit, that was intentional.  rlimits are inherited and I 
specifically didn't want that behavior, similar to p_cpulimit.  I still 
agree resource limits are not an ideal interface to use for this, I'll 
look further.

-- 

        Where am I, and what am I doing in this handbasket?

Wes Peters                                               wes@softweyr.com



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