Date: Fri, 28 Jul 2006 14:47:01 +0100 From: Brian Candler <B.Candler@pobox.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org, Oliver Fromme <olli@lurza.secnetix.de> Subject: Re: vmstat's entries type Message-ID: <20060728134701.GA45273@uk.tiscali.com> In-Reply-To: <200607280928.36573.jhb@freebsd.org> References: <200607251254.k6PCsBef092737@lurza.secnetix.de> <200607271058.13055.jhb@freebsd.org> <20060728121525.GA44917@uk.tiscali.com> <200607280928.36573.jhb@freebsd.org>
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On Fri, Jul 28, 2006 at 09:28:36AM -0400, John Baldwin wrote:
> lock incl counter
> jnc 1f
> lock incl counter+4
> 1:
That looks safe to me. How expensive is a forward jump like that, i.e. do
you get a pipeline bubble?
The 'polling' argument says just do
lock incl counter
and poll all counters every 5 minutes, looking for a wrap. I think that's
almost certainly going to be cheaper, as long as you can keep track of where
all these counters are located.
Regards,
Brian.
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