Re: [Xen-devel] /proc/xen/xenbus supports watch?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 23 Sep 2005, at 00:51, Rusty Russell wrote:

> Which is why I am pondering a bundle/unbundle interface for
> transactions, so we can migrate them with the domain.  Summary:
How do you guarantee consistency of the migrated transaction? It holds 
no locks or anything on the values it has read while it is not running, 
so they could change under its feet?
Correctness-wise, it sounds to me as though bundle/unbundle has the 
same correctness guarantees as drop all writes, ENOENT on reads, and 
EAGAIN on commit.
Or is the bundling simply so that you can continue to feed consistent 
snapshotted values to the transaction from its 'shadow store', even 
though it is ultimately a doomed transaction?
Do xenstored's performance problems stem from copying the store for 
every transaction?
 -- Keir


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