Re: [Xen-devel] [PATCH] xen: blkif.h: document linux xen-block multi-page ring implementation

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.05.15 at 17:22, <konrad.wilk@xxxxxxxxxx> wrote:
> Doing an git annotate shows:
> 
> commit 829f2a9c6dfae13faee4e24b953441113338e0f2
> Author: Justin T. Gibbs <justing@xxxxxxxxxxxxxxxx>
> Date:   Thu Feb 23 10:02:30 2012 +0000
> 
>     blkif.h: Document the Red Hat and Citrix blkif multi-page ring extensions
>     
>     No functional changes.
> 
> 
> Which says:
> 
>  * (1) Multi-page ring buffer scheme first developed in the Citrix XenServer
> + *     PV drivers.
> + * (2) Multi-page ring buffer scheme first used in some RedHat distributions
> + *     including a distribution deployed on certain nodes of the Amazon
> + *     EC2 cluster.
> + * (3) Support for multi-page ring buffers was implemented independently,
> + *     in slightly different forms, by both Citrix and RedHat/Amazon.
> 
> 
> And I double checked the linux-2.6.18.hg tree and I see no mention of 
> multi-page. I wonder where such code exists?

We have support for multi page rings in our kernels, largely because
(iirc) Amazon had asked it.

Jan


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