Date: Tue, 12 May 2009 14:34:08 -0700 From: Julian Elischer <julian@elischer.org> To: Marko Zec <zec@FreeBSD.org> Cc: Perforce Change Reviews <perforce@freebsd.org>, Brooks Davis <brooks@freebsd.org> Subject: Re: PERFORCE change 161987 for review Message-ID: <4A09EB50.3030608@elischer.org> In-Reply-To: <200905121848.n4CImKQt036691@repoman.freebsd.org> References: <200905121848.n4CImKQt036691@repoman.freebsd.org>
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Marko Zec wrote: > http://perforce.freebsd.org/chv.cgi?CH=161987 > > Change 161987 by zec@zec_tpx32 on 2009/05/12 18:47:49 > > Back out O(n**2) ad-hoc hack for searching for available > ifunits in cloning ifnets, and restore the standard O(n) > bitmapped searching / ifunit allocation method for both > default and options VIMAGE builds. > > HOWEVER, hereby we also introduce per-vnet if_clone driver > registration and ifunit allocation. As a (necessary) example, > if_loop is modified to attach itself as an independent > cloner instance to each vnet. > > This approach has a neat byproduct: if_clone drivers that > do not explicitly declare themselves as multi-vnet, by > exporting an iattach() method and registering to the vnet > framework, continue to work with unmodified semantics in > the default vnet. However, they will NOT be available > in other vnets. > > This brings us a step closer to being able to selectively > attach subsystems to particular vnets, instead of having > all subsystems unconditionally available to all vnets by > default. > excellent sidestep.
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