Re: [PATCH v4 00/11] Arm cache coloring

[Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>]

Hi Jan,

On Mon, Jan 23, 2023 at 4:52 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> On 23.01.2023 16:47, Carlo Nonato wrote:
> > Shared caches in multi-core CPU architectures represent a problem for
> > predictability of memory access latency. This jeopardizes applicability
> > of many Arm platform in real-time critical and mixed-criticality
> > scenarios. We introduce support for cache partitioning with page
> > coloring, a transparent software technique that enables isolation
> > between domains and Xen, and thus avoids cache interference.
> >
> > When creating a domain, a simple syntax (e.g. `0-3` or `4-11`) allows
> > the user to define assignments of cache partitions ids, called colors,
> > where assigning different colors guarantees no mutual eviction on cache
> > will ever happen. This instructs the Xen memory allocator to provide
> > the i-th color assignee only with pages that maps to color i, i.e. that
> > are indexed in the i-th cache partition.
> >
> > The proposed implementation supports the dom0less feature.
> > The proposed implementation doesn't support the static-mem feature.
> > The solution has been tested in several scenarios, including Xilinx Zynq
> > MPSoCs.
> >
> > v4 global changes:
> > - added "llc" acronym (Last Level Cache) in multiple places in code
> >   (e.g. coloring.{c|h} -> llc_coloring.{c|h}) to better describe the
>
> Please can you use dashes in favor of underscores in the names of new
> files?

Yes, ok.

> Jan

I also forgot to mention that this patch series applies on top of the
most recent
version of Julien's series (https://marc.info/?l=xen-devel&m=167360469228247).

Thanks.