Date: Sat, 20 Oct 2007 18:21:33 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Kris Kennaway <kris@FreeBSD.org> Cc: stable@freebsd.org, Alfred Perlstein <alfred@freebsd.org>, jhb@freebsd.org Subject: Re: LOCK_PROFILING in -stable Message-ID: <20071020181811.W70919@fledge.watson.org> In-Reply-To: <4719B06F.3000103@FreeBSD.org> References: <20071019232846.GQ31826@elvis.mu.org> <4719B06F.3000103@FreeBSD.org>
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On Sat, 20 Oct 2007, Kris Kennaway wrote: > Alfred Perlstein wrote: >> Hey guys, I have LOCK_PROFILING done for a product based on FreeBSD-6, this >> means I can relatively easily backport LOCK_PROFILING from FreeBSD-7 to >> FreeBSD-6. >> >> Do we want this? >> >> I'd like to do it if people want it. > > I think it should be done, performance is a lot better than the old 6.x > version and it also adds another very useful performance metric (time spent > waiting for the lock). The only concern is that it doesn't break ABI > support when not compiled in, but I'm pretty sure you've already told me > this is OK. Thanks for looking at this. This is my feeling also -- I would consider ABI breakage a show stopper for 6.x, but feel otherwise that the new code is much more mature and capable and would be quite beneficial to people building appliances and related products on 6.x. You might check with Attilio about whether there are any remaining outstanding issues that need to be resolved first, and make sure to send a heads up out on stable@ and put a note in UPDATING that the option and details have changed. Robert N M Watson Computer Laboratory University of Cambridge
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