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Date:      Tue, 25 Mar 2003 00:42:47 -0800
From:      Marcel Moolenaar <marcel@xcllnt.net>
To:        Poul-Henning Kamp <phk@phk.freebsd.dk>
Cc:        David Schultz <das@FreeBSD.ORG>, Garance A Drosihn <drosih@rpi.edu>, Dan Nelson <dnelson@allantgroup.com>, Wes Peters <wes@softweyr.com>, freebsd-arch@FreeBSD.ORG
Subject:   Re: Patch to protect process from pageout killing
Message-ID:  <20030325084247.GA17195@dhcp01.pn.xcllnt.net>
In-Reply-To: <14382.1048580753@critter.freebsd.dk>
References:  <20030325075342.GA5450@HAL9000.homeunix.com> <14382.1048580753@critter.freebsd.dk>

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On Tue, Mar 25, 2003 at 09:25:53AM +0100, Poul-Henning Kamp wrote:
> 
> 3. A mechanism to influence the "Who do we kill ?" decision once
>    things have gone from bad to worse.
> 
> To tackle them from behind:
> 
> Wes has a proposal for #3 which is a per-process flag which says
> "I'm sacred".  I think that is a sound principle since that is
> usually exactly what people want:  Do Not Kill This Process.
> 
> Certain processes already enjoy special protection, pid==1 most
> notably, this would just be a way to make the same protection
> available to other processes.  I'm not happy about using the
> resourcelimit code for booleans, and I don't think the flag
> should be inherited, but otherwise I'm for the idea.

JFYI: On ia64 there are 12 bits in the ELF header reserved for OS
specific flags. A very natural way to flag a process as being sacred
is by flagging the ELF executable. You could use brandelf for that.

-- 
 Marcel Moolenaar	  USPA: A-39004		 marcel@xcllnt.net

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