Date: Fri, 2 Sep 2005 14:40:11 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-current@freebsd.org Cc: Don Lewis <truckman@freebsd.org>, rwatson@freebsd.org, current@freebsd.org Subject: Re: Witness patch Message-ID: <200509021440.13022.jhb@FreeBSD.org> In-Reply-To: <200509020352.j823qKm9022255@gw.catspoiler.org> References: <200509020352.j823qKm9022255@gw.catspoiler.org>
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On Thursday 01 September 2005 11:52 pm, Don Lewis wrote: > On 1 Sep, John Baldwin wrote: > > This patch forces witness to complain if any mutex is held when Giant is > > locked to enforce Giant being the first mutex in the lock order. This > > might help track down some of the network LORs being reported recently. > > > > http://www.FreeBSD.org/~jhb/patches/witness.patch > > I think it would make sense to print different messages for the > different trigger conditions. Hmm, I guess I view them as all just being reversals, and that we have some implicit orders that go something like this: sleepable locks --> Giant --> non-sleepable locks --> spin locks -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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