Date: Sat, 15 Mar 2003 07:47:24 +0100 From: Robert Drehmel <robert@zoot.drehmel.com> To: Mike Silbersack <silby@silby.com> Cc: Garance A Drosihn <drosih@rpi.edu>, Poul-Henning Kamp <phk@phk.freebsd.dk>, "Daniel C. Sobral" <dcs@tcoip.com.br>, 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: <20030315064724.GA559@zoot.drehmel.com> In-Reply-To: <20030314160313.O4480@odysseus.silby.com> References: <8023.1047662161@critter.freebsd.dk> <p05200f2bba97e5a92150@[128.113.24.47]> <20030314140414.V4480@odysseus.silby.com> <p05200f2cba97ef395f0e@[128.113.24.47]> <20030314152510.A4480@odysseus.silby.com> <p05200f2eba97fc3b6b96@[128.113.24.47]> <20030314160313.O4480@odysseus.silby.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Mar 14, 2003 at 04:07:02PM -0600, Mike Silbersack wrote: > > On Fri, 14 Mar 2003, Garance A Drosihn wrote: > > > Almost all of the suggestions that have come forward are good > > ideas to do *in addition* to SIGDANGER, but SIGDANGER provides > > a program with a way to SPECIFICALLY address this very SPECIFIC > > issue, without having to care what UID it got, or what nice > > The problem with SIGDANGER is that only two programs will use it: > > 1. lpd at RPI. > > 2. The forkbomb someone will post to bugtraq the day after we add the > feature. > > I fully agree that there needs to be a way to prioritize processes. > However, adding an extra signal is just not the way to do it. If we want > a manual system like that, let's just add a "don't kill" bit to the proc > structure which can be set through nice or some other utility by the > system administrator. This could also be a multi-level system; add an adjustable `importance' value (defaulting to zero) to processes, to clearly express which processes are to be killed in the worst case. For processes with the same `importance' value, a process with a higher `nice' value is considered less important. This makes thing work out-of-the-box without importance configurations, but allows people to change each process' importance easily. E.g., reimp +2 X xterm vi reimp +1 -p 23491 make reimp -1 mozilla Or let's bind a default importance value to vnodes, initialized by a global file at system startup and always modifiable through a system call (used by the reimp utility) :-) > > Mike "Silby" Silbersack > ciao, -robert To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030315064724.GA559>