From owner-freebsd-hackers  Wed Jul 14  1:55:42 1999
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Date: Wed, 14 Jul 1999 09:53:59 +0100
From: Jon Ribbens <jon@oaktree.co.uk>
To: Doug Rabson <dfr@nlsystems.com>
Cc: Alfred Perlstein <bright@rush.net>,
	"Daniel C. Sobral" <dcs@newsguy.com>, freebsd-hackers@freebsd.org,
	tech-userlevel@netbsd.org, tech@openbsd.org
Subject: Re: Replacement for grep(1) (part 2)
Message-ID: <19990714095359.A13286@oaktree.co.uk>
Mail-Followup-To: Doug Rabson <dfr@nlsystems.com>,
	Alfred Perlstein <bright@rush.net>,
	"Daniel C. Sobral" <dcs@newsguy.com>, freebsd-hackers@freebsd.org,
	tech-userlevel@netbsd.org, tech@openbsd.org
References: <19990713100228.C10979@oaktree.co.uk> <Pine.BSF.4.10.9907140829520.58023-100000@salmon.nlsystems.com>
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In-Reply-To: <Pine.BSF.4.10.9907140829520.58023-100000@salmon.nlsystems.com>; from Doug Rabson on Wed, Jul 14, 1999 at 08:31:07AM +0100
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Doug Rabson <dfr@nlsystems.com> wrote:
> Overcommit can be used for many reasons. I use it to reserve a large
> linear address space to mmap alpha i/o spaces to which allows an efficient
> implementation of inx/outx in user mode:
> 
>   UID   PID  PPID CPU PRI NI   VSZ  RSS WCHAN  STAT  TT       TIME COMMAND
>     0 43655 43652   7   2  0 12616584 12456 select S     ??  1036:41.62 /usr/X11R6/bin/X -auth /usr/X11R6/lib/X11/xdm/authdir/A:0-w43652
> 
> The X server is using 12G of address space..

This is not an argument for malloc() to overcommit by default, it is an
argument for there to be a way of allocating address space with no swap
reserved *when you specifically ask for it*. Of course I would not disagree
with this.

Cheers


Jon
-- 
\/ Jon Ribbens / jon@oaktree.co.uk


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