Re: [Xen-devel] libxl/xl memory paging/sharing/ballooning/etc proposal.

["Andres Lagar-Cavilla" <andres@xxxxxxxxxxxxxxxx>]

> On Thu, 2012-03-15 at 14:40 +0000, Andres Lagar-Cavilla wrote:
>> > On Thu, 2012-03-15 at 14:12 +0000, Andres Lagar-Cavilla wrote:
>> > [...]
>> >>
>> >> > libxl_domain_(enable|disable)_sharing(ctx, domid)
>> >> >
>> >> >         Does what it says on the tin.
>> >
>> > Also long running?
>>
>> Enable is simply setting a flag. Disable is not a problem either: the
>> hypervisor will silently take care of unshares.
>>
>> However, if there is an ENOMEM in an unshare, someone has to be
>> listening
>> or the domain will crash. It could be that the xl daemon is tasked with
>> this for the lifetime of the domain, once sharing has been enabled at
>> least once. I don't think it's something to decide upon right now.
>
> xl has explicitly decided not to care about sharing so this would be the
> problem of whichever actor does do sharing...
>
> Given the assumption that a sharing-actor would have to be system wide
> perhaps we don't need these libxl functions to start stop it (since it
> will be running already) and the very act (no pun intended) of setting
> actor="blah-sharing" should be enough to enable or disable sharing for a
> particular guest?

Both points are sensible. Ack from me.
Andres

>
> Ian.
>
>
>



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