Re: [Xen-devel] [RFC PATCH 0/8] Xen: FIFO-based event channel ABI

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Aug 09, 2013 at 07:08:32PM +0100, David Vrabel wrote:
> This is an RFC of the FIFO-based event channel ABI described in this
> design document:
> 
> http://xenbits.xen.org/people/dvrabel/event-channels-D.pdf
> 
> Changes in draft D include:
> 
> - Only Xen writes to the HEAD field in the control block
> 
> - Added a link_bits field to EVTCHNOP_init_control to return the
>   number of valid bits for the LINK field.
> 
> Patch 1-4 do some preparatory work for supporting alternate ABIs.
> 
> Patch 5-8 expand the number of evtchn objects a domain may have to

Patch 5-6. :-)

> changing how they are allocated.
> 
> Patch 7-8 add the ABI and the implementation.  Patch 8 list some of
> the known limitations with this RFC implementation.
> 
> Changes in v1:
> 
> - Updates for Draft D of the design.
> - 130,000+ event channels are now supported.
> - event_port.c -> event_2l.c and only contains 2l functions.
> - Addresses various review comments
>   - int -> unsigned in lots of places
>   - use write_atomic() to set HEAD
>   - removed MAX_EVTCHNS
>   - evtchn_ops are const.
> - Pack struct evtchns better to reduce memory needed.
> 
> David

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