Re: [Xen-devel] [PATCH v3 06/17] SUPPORT.md: Add scalability features

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.11.17 at 20:20, <george.dunlap@xxxxxxxxxx> wrote:
> Superpage support and PVHVM.
> 
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
with one remark:

> +## Scalability
> +
> +### Super page support
> +
> +    Status, x86 HVM/PVH, HAP: Supported
> +    Status, x86 HVM/PVH, Shadow, 2MiB: Supported
> +    Status, ARM: Supported
> +
> +NB that this refers to the ability of guests
> +to have higher-level page table entries point directly to memory,
> +improving TLB performance.
> +On ARM, and on x86 in HAP mode,
> +the guest has whatever support is enabled by the hardware.
> +On x86 in shadow mode, only 2MiB (L2) superpages are available;
> +furthermore, they do not have the performance characteristics of hardware 
> superpages.
> +
> +Also note is feature independent of the ARM "page granularity" feature (see 
> below).

Earlier lines in this block suggest you've tried to honor a certain
line length limit, while the two last non-empty ones clearly go
beyond 80 columns.

Jan


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