Date: Sat, 14 Dec 2002 20:28:45 -0500 From: "Brian F. Feldman" <green@FreeBSD.ORG> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Jake Burkholder <jake@locore.ca>, "Brian F. Feldman" <green@FreeBSD.ORG>, John Baldwin <jhb@FreeBSD.ORG>, Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.ORG, alpha@FreeBSD.ORG Subject: Re: UMA panic under load Message-ID: <200212150128.gBF1SjS2014362@green.bikeshed.org> In-Reply-To: Your message of "Sat, 14 Dec 2002 17:10:38 PST." <200212150110.gBF1AcB6060179@apollo.backplane.com>
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Matthew Dillon <dillon@apollo.backplane.com> wrote:
> What about something like this. If the vm_refcnt is still being
> decremented too early, could it be moved to just before the thread_exit()
> call?
The problem that had to be fixed by removing this race was that two
processes with the same vmspace can exit at the same time, and the
vm_refcnt could be 2 the entire time, so neither would perform the current
if (--vm->vm_refcnt == 0) { block.
--
Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\
<> green@FreeBSD.org <> bfeldman@tislabs.com \ The Power to Serve! \
Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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