On 08/02/2024 17:34, Mark Rutland wrote:

On Fri, Feb 02, 2024 at 08:07:31AM +0000, Ryan Roberts wrote:

quoted

Hi All,

Hi Ryan,

I assume this is the same as your 'features/granule_perf/contpte-lkml_v' branch
on https://gitlab.arm.com/linux-arm/linux-rr/

Yep - great detective work! features/granule_perf/contpte-lkml_v5 corresponds
exactly to what I posted with all the dependencies in place.

I've taken a quick look, and I have a few initial/superficial comments before
digging into the detail on the important changes.

Thanks for doing this!

quoted

Patch Layout
============

In this version, I've split the patches to better show each optimization:

  - 1-2:    mm prep: misc code and docs cleanups

I'm not confident enough to comment on patch 2, but these look reasonable to
me.

Thanks. David has acked patch 2 already so I think we are good there.

quoted

  - 3-8:    mm,arm,arm64,powerpc,x86 prep: Replace pte_next_pfn() with more
            general pte_advance_pfn()

These look fine to me.

Thanks!

quoted

  - 9-18:   arm64 prep: Refactor ptep helpers into new layer

The result of patches 9-17 looks good to me, but the intermediate stages where
some functions are converted is a bit odd, and it's a bit painful for review
since you need to skip ahead a few patches to see the end result to tell that
the conversions are consistent and complete.

IMO it'd be easier for review if that were three patches:

1) Convert READ_ONCE() -> ptep_get()
2) Convert set_pte_at() -> set_ptes()
3) All the "New layer" renames and addition of the trivial wrappers

Yep that makes sense. I'll start prepping that today. I'll hold off reposting
until I have your comments on 19-25. I'm also hoping that David will repost the
zap series today so that it can get into mm-unstable by mid-next week. Then I'll
repost on top of that, hopefully by end of next week, folding in all your
comments. This should give planty of time to soak in linux-next.

Thanks,
Ryan

Patch 18 looks fine to me.

quoted

  - 19:     functional contpte implementation
  - 20-25:  various optimizations on top of the contpte implementation

I'll try to dig into these over the next few days.

Mark.