Re: [Xen-devel] [PATCH RFC 0/6] Slotted channels for sync vm_events

[Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>]

On Wed, 2018-12-19 at 20:52 +0200, Petre Pircalabu wrote:
> This patchset is a rework of the "multi-page ring buffer" for
> vm_events
> patch based on Andrew Cooper's comments.
> For synchronous vm_events the ring waitqueue logic was unnecessary as
> the
> vcpu sending the request was blocked until a response was received.
> To simplify the request/response mechanism, an array of slotted
> channels
> was created, one per vcpu. Each vcpu puts the request in the
> corresponding slot and blocks until the response is received.
> 
> I'm sending this patch as a RFC because, while I'm still working on
> way to
> measure the overall performance improvement, your feedback would be a
> great
> assistance.
> 

Is anyone still using asynchronous vm_event requests? (the vcpu is not
blocked and no response is expected).
If not, I suggest that the feature should be removed as it
(significantly) increases the complexity of the current implementation.

Many thanks,
Petre

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