Date: Thu, 1 Jul 1999 02:46:26 -0400 (EDT) From: "Brian F. Feldman" <green@unixhelp.org> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Julian Elischer <julian@whistle.com>, Garrett Wollman <wollman@khavrinen.lcs.mit.edu>, Peter Wemm <peter@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern init_main.c kern_fork.c kern_linker.c vfs_aio.c src/sys/sys proc.h Message-ID: <Pine.BSF.4.10.9907010243150.68413-100000@janus.syracuse.net> In-Reply-To: <43774.930765873@critter.freebsd.dk>
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On Wed, 30 Jun 1999, Poul-Henning Kamp wrote:
> In message <Pine.BSF.4.10.9906301357250.50480-100000@janus.syracuse.net>, "Bria
> n F. Feldman" writes:
>
> >I thought about this a LOT, and it's not a great idea to hold a pointer to
> >the proc...
>
> It's not really that different from doing it to a vnode...
>
> Mind you, I've been trying to find a way NOT to do it for vnodes
> because I would like to be able to free them again. And I'm a
> little bit concerned if the zone allocator never frees pages again
> because that means that one mistake with a fork(2) and a lot of
> RAM (not VM, actual RAM) is tied up until next reboot.
That's a very good concern. I don't especially love that happening.
> So if we have decided to make struct proc a stable storage kind of
> thing, then holding pointers is perfectly ok (with the addition of
> a serial number, p_pid wont do). It is the move to stable storage
> that has me concerned.
Yeah, a u_int64_t p_gencnt is my thought; but the proc-holding issue..
if it's NOT type-stable storage, then pfind() is the only way; isn't
pfind() very fast though? It's just a hash and following a link of
procs...
>
> --
> Poul-Henning Kamp FreeBSD coreteam member
> phk@FreeBSD.ORG "Real hackers run -current on their laptop."
> FreeBSD -- It will take a long time before progress goes too far!
>
Brian Fundakowski Feldman _ __ ___ ____ ___ ___ ___
green@FreeBSD.org _ __ ___ | _ ) __| \
FreeBSD: The Power to Serve! _ __ | _ \._ \ |) |
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