Re: [Xen-devel] [PATCH v4 5/8] arm/vm_event: get/set registers

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 05/30/16 23:37, Tamas K Lengyel wrote:
> Well, as we discussed it in the previous revision, there is no
> hard-set rule of what can and cannot be transmitted here. The only
> thing to keep in mind is to not grow this struct to be too large. The
> registers sent right now represent a "best guess" of what may be
> useful for performance-sensitive vm_event applications on ARM. It can
> be adjusted in the future if applications require other registers.

Obviously I agree with Tamas here, my only comment would be that in my
humble opinion multipage vm_event ring buffers are probably the way to
go in the long run. I'm not sure if other parts of Xen already employ
such devices (or if indeed there's support for this at all at this
time), but this might be something worth looking into.

Again, this does not imply that there's anything wrong with this patch
or that this is an issue this series should address.


Thanks,
Razvan

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