Re: [Xen-devel] [PATCH 2 of 5] Improve ring management for memory events. Do not lose guest events

[Olaf Hering <olaf@xxxxxxxxx>]

On Thu, Dec 01, Andres Lagar-Cavilla wrote:

> MAX_HVM_VCPUS sits at 128 right now. Haven't compile checked, but that
> probably means we would need a two page ring. And then, when 1024-cpu
> hosts arrive and we grow MAX_HVM_VCPUS, we grow the ring size again.

The ring has 64 entries.

> Or, we could limit the constraint to the number of online vcpus, which
> would get somewhat tricky for vcpu hot-plugging.
> 
> I can fix that separately, once there is a decision on which way to go re
> ring management.


I just sent "[PATCH] mem_event: use wait queue when ring is full" to the
list. This version ought to work, it takes the request from both target
and foreign cpus into account and leaves at lease one slot for the
target.


Olaf

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