Date: Fri, 14 Mar 2003 17:24:42 -0300 From: "Daniel C. Sobral" <dcs@tcoip.com.br> To: Mike Silbersack <silby@silby.com> Cc: Garance A Drosihn <drosih@rpi.edu>, Poul-Henning Kamp <phk@phk.freebsd.dk>, Juli Mallett <jmallett@FreeBSD.org>, Eivind Eklund <eivind@FreeBSD.org>, David Schultz <das@FreeBSD.org>, src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/vm ... SIGDANGER Message-ID: <3E723A8A.8070100@tcoip.com.br> In-Reply-To: <20030314140414.V4480@odysseus.silby.com> References: <8023.1047662161@critter.freebsd.dk> <p05200f2bba97e5a92150@[128.113.24.47]> <20030314140414.V4480@odysseus.silby.com>
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Mike Silbersack wrote:
>
> I'm really not sure how much of a help this SIGDANGER or whatever will be.
> As I see it, there are two cases of OOM:
>
> 1. Heavy load, lots of busy processes, all legitimate.
> - Nobody has complained about this case having problems.
>
> 2. Light load, then some program goes crazy and forks / chews up ram. X
> gets killed.
> - I think this is what people are complaining about.
No, there are a couple of other cases:
3) Serious Processing(tm) application blithely allocates memory until
memory allocation fails. At that point it stops allocating memory.
Another application then uses some previously untouched allocated
memory, and first application gets killed losing hours of work.
4) Very Important Server allocates a lot of memory, and gets killed when
stupid user starts another xterm.
Whatever you may or may not think the correct way of handling these two
cases is, people *have* complained of our present way of handling them.
--
Daniel C. Sobral (8-DCS)
Gerencia de Operacoes
Divisao de Comunicacao de Dados
Coordenacao de Seguranca
TCO
Fones: 55-61-313-7654/Cel: 55-61-9618-0904
E-mail: Daniel.Capo@tco.net.br
Daniel.Sobral@tcoip.com.br
dcs@tcoip.com.br
Outros:
dcs@newsguy.com
dcs@freebsd.org
capo@notorious.bsdconspiracy.net
Lowery's Law:
If it jams -- force it. If it
breaks, it needed replacing anyway.
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