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Re: [Xen-devel] [PATCH 0/2] Change xs_read_watch interfaces to support variable arguments

On Mon, Oct 03, 2005 at 11:43:43PM -0500, Anthony Liguori wrote:

> The following set of changes modify the read_watch interface in 
> userspace and in the kernel to support variable arguments.  This is in 
> preparation for adding domid to @{introduce,release}Domain watches.  
> This will allow backends to automatically reap on domain destruction 
> which should eliminate a large number of the zombie problems we're 
> having on domain destruction since Xend no longer plays a role in 
> freeing that memory.

Hi Anthony,

What you've done in your patch stands as a sensible thing on its own, I think,
so I'm not objecting to that, but I am interested in why you think it will
help with the zombies.  On domain destruction, xend is _supposed_ to remove
all the relevant entries of the store, and the backend drivers are _supposed_
to notice this and close themselves down.  If you have evidence that either of
those things aren't happening, then we should regard that as a bug,
independent of your patch.  Have you seen that happening?


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