Date: Fri, 14 Mar 2003 16:05:48 -0500 (EST) From: John Baldwin <jhb@FreeBSD.org> To: Pawel Jakub Dawidek <nick@garage.freebsd.pl> Cc: cvs-all@FreeBSD.org, cvs-src@FreeBSD.org, src-committers@FreeBSD.org, David Schultz <das@FreeBSD.org>, Eivind Eklund <eivind@FreeBSD.org>, Juli Mallett <jmallett@FreeBSD.org>, Poul-Henning Kamp <phk@phk.freebsd.dk>, Garance A Drosihn <drosih@rpi.edu>, Mike Silbersack <silby@silby.com>, "Daniel C. Sobral" <dcs@tcoip.com.br> Subject: Re: cvs commit: src/sys/vm ... SIGDANGER Message-ID: <XFMail.20030314160548.jhb@FreeBSD.org> In-Reply-To: <20030314204454.GI567@garage.freebsd.pl>
next in thread | previous in thread | raw e-mail | index | archive | help
On 14-Mar-2003 Pawel Jakub Dawidek wrote: > On Fri, Mar 14, 2003 at 05:24:42PM -0300, Daniel C. Sobral wrote: > +> 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. > > Why not choose process to kill by their priority? > > If we got some important processes even without uid=0 we could renice them > to value less than 0. I don't think raw priority should be taken into account, but using the nice value in the algorithm (perhaps as a weight of some sort?) sounds like a good idea actually. nice is an existent mechanism for SA's to mark which processes are more important than others so it seems intuitive to seek to preserve nice -20 processes at the expense of nice +20 processes. That also works without changes to existing programs and will return expected results in current systems w/o the need for major adjustments. SIGDANGER, etc. might also be a good idea, but I think letting nice factor into the equation is a good thing regardless. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ 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?XFMail.20030314160548.jhb>