Date: Fri, 14 Mar 2003 17:23:34 -0500 From: Garance A Drosihn <drosih@rpi.edu> To: John Baldwin <jhb@FreeBSD.org>, 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>, Mike Silbersack <silby@silby.com>, "Daniel C. Sobral" <dcs@tcoip.com.br> Subject: Re: cvs commit: src/sys/vm ... SIGDANGER Message-ID: <p05200f31ba980635c21a@[128.113.24.47]> In-Reply-To: <p05200f2dba97f542c912@[128.113.24.47]> References: <XFMail.20030314160548.jhb@FreeBSD.org> <p05200f2dba97f542c912@[128.113.24.47]>
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At 4:37 PM -0500 3/14/03, Garance A Drosihn wrote: >Perhaps the problem people have with SIGDANGER, even though it has >in fact been proven to be useful in real-life situations, is that >as implemented by AIX you have to change some source code (maybe >in a variety of programs) to take advantage of it. That is an >interesting point, but perhaps we can solve that. > >How about having the default SIGDANGER signal handler do something >a little more interesting than always ignoring the signal? Perhaps >have the default routine check some process-specific value, and it >(the default signal handler) can decide what to do based on that >value. Then give a system administrator a way to set the value. >say, value 1 = kill process at threshold #1 > 2 = kill process at threshold #2 (& not at #1) > 3 = Only kill process if you're still running out > of space after killing all you could kill at > threshold's #1 and #2. > 4 = if you're still running out of memory after #3, > then just reboot, because it's hopeless... :-) > >To match the AIX behavior of SIGDANGER, the default would be #2. We could even add another value. All the above values could mean "and ignore any program-specified SIGDANGER routine", while a value 0 would exactly match the historical AIX behavior. -- Garance Alistair Drosehn = gad@gilead.netel.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-src" in the body of the message
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