Date: Wed, 13 Apr 2005 00:07:11 +0200 From: Matthias Buelow <mkb@mkbuelow.net> To: Nick Barnes <Nick.Barnes@pobox.com> Cc: freebsd-stable@freebsd.org Subject: Re: kernel killing processes when out of swap Message-ID: <200504122207.j3CM7BE7018595@drjekyll.mkbuelow.net> In-Reply-To: Message from Nick Barnes <Nick.Barnes@pobox.com> <52802.1113341617@thrush.ravenbrook.com>
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Nick Barnes <Nick.Barnes@pobox.com> writes: >> This stuff has been discussed in the past. >Indeed. For a couple of examples from the days before BSD systems got >overcommit, see these threads from 1990 and 1991: > ><http://groups-beta.google.com/group/comp.unix.aix/browse_frm/thread/91541dbf6 >b658465/4c590978f1001507?q=overcommit&rnum=14#4c590978f1001507> > ><http://groups-beta.google.com/group/comp.unix.aix/browse_frm/thread/38c9bb999 >6d30eb1/e8c30f78c44a3f62?q=overcommit&rnum=12#e8c30f78c44a3f62> Apparently, it can be turned off on AIX, quoting from http://tinyurl.com/4epc8: ``If the PSALLOC environment variable is set to early, then every program started in that environment from that point on, but not including currently running processes, runs in the early allocation environment. In the early allocation environment, interfaces such as the malloc subroutine and the brk subroutine will fail if sufficient paging space cannot be reserved when the request is made. Processes run in the early allocation environment mode are not sent the SIGKILL signal if a low paging space condition occur.'' Googling showed that on Linux 2.6, overcommit can be disabled globally through the vm.overcommit_memory sysctl. I hope that some day some mechanism to solve that problem will be available in FreeBSD aswell. mkb.
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