Date: Thu, 20 Mar 2003 11:49:06 -0300 From: Mario Sergio Fujikawa Ferreira <lioux@FreeBSD.org> To: Phil Regnauld <regnauld@catpipe.net> Cc: Anton Berezin <tobez@tobez.org>, Dag-Erling Sm?rgrav <des@ofug.org>, Wes Peters <wes@softweyr.com>, Juli Mallett <jmallett@FreeBSD.org>, Eivind Eklund <eivind@FreeBSD.org>, Mike Silbersack <silby@silby.com>, David Schultz <das@FreeBSD.org>, src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/vm vm_map.c vm_map.h vm_pageout.c Message-ID: <20030320144928.46460.qmail@exxodus.fedaykin.here> In-Reply-To: <20030320085707.GD47243@catpipe.net> References: <200303122313.h2CNDHMU046431@repoman.freebsd.org> <20030314012954.A42430@FreeBSD.org> <20030314101857.A98861@FreeBSD.org> <200303171156.40901.wes@softweyr.com> <20030319143619.GA47243@catpipe.net> <xzpu1dzyohn.fsf@flood.ping.uio.no> <20030320081820.GA81566@heechee.tobez.org> <20030320085707.GD47243@catpipe.net>
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On Thu, Mar 20, 2003 at 09:56:45AM +0100, Phil Regnauld wrote: > Anton Berezin (tobez) writes: > > > > > > man setrlimit > > > > setrlimit is a contract signed by a process, while what Phil suggests is > > a contract signed by a process _and_ the kernel. > > Actually, I was thinking about the possibility to extend setrlimit > semantics to support this. i.e. an extra parameter which would > indicate that we want to be notified (via the return value) > that our contract request could not be fulfilled. Using this > extra parameter would modify's the kernel's behaviour in that > the kernel will "agree" to preserver this process as much as possible > in case of resource starvation (that's the main difference with > setrlimit). One thing though. This would only be safe within trust boundaries. Suppose a process requests the kernel for a contract of all available memory. No other processes will be able to request contracts anymore. I am not saying this shouldn't be implemented. I am just voicing a possible drawback of the solution. -- Mario S F Ferreira - DF - Brazil - "I guess this is a signature." FreeBSD Committer | CS Developer flames to beloved devnull@someotherworldbeloworabove.org feature, n: a documented bug | bug, n: an undocumented feature To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-src" in the body of the message
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