On Thu, Aug 29, 2024 at 5:48 PM Oliver Upton [off-list ref] wrote:

On Thu, Aug 29, 2024 at 05:33:00PM -0700, James Houghton wrote:

quoted

On Mon, Aug 19, 2024 at 1:42 PM Oliver Upton [off-list ref] wrote:

quoted

Asking since you had a setup / data earlier on when you were carrying
the series. Hopefully with supportive data we can get arm64 to opt-in
to HAVE_KVM_MMU_NOTIFIER_YOUNG_FAST_ONLY as well.

I'll keep trying some other approaches I can take for getting similar
testing that Yu had; it is somewhat difficult for me to reproduce
those tests (and it really shouldn't be.... sorry).

No need to apologize. Getting good test hardware for arm64 is a complete
chore. Sure would love a functional workstation with cores from this
decade...

quoted

I think it makes most sense for me to drop the arm64 patch for now and
re-propose it (or something stronger) alongside enabling aging. Does
that sound ok?

I'm a bit disappointed that we haven't gotten forward progress on the
arm64 patches, but I also recognize this is the direction of travel as
the x86 patches are shaping up.

So yeah, I'm OK with it, but I'd love to get the arm64 side sorted out
soon while the context is still fresh.

Converting the aging notifiers to holding mmu_lock for read seems like
a pure win and minimal churn. Can we keep that patch in v7 (which
depends on the lockless notifier refactor, i.e. is not completely
stand-alone)? We can revisit enabling MGLRU on arm64 in a subsequent
series.

--
Thanks,
Oliver