Re: [RESEND PATCH] mm: align larger anonymous mappings on THP boundaries

[Kefeng Wang]

On 2024/5/7 19:13, David Hildenbrand wrote:
> > https://github.com/intel/lmbench/blob/master/src/lat_mem_rd.c#L95
> >
> > > suggest. If you want to try something semi-randomly; it might be 
> > > useful to rule
> > > out the arm64 contpte feature. I don't see how that would be 
> > > interacting here if
> > > mTHP is disabled (is it?). But its new for 6.9 and arm64 only. 
> > > Disable with
> > > ARM64_CONTPTE (needs EXPERT) at compile time.
> > I don't enabled mTHP, so it should be not related about ARM64_CONTPTE,
> > but will have a try.

After ARM64_CONTPTE disabled, memory read latency is similar with 
ARM64_CONTPTE enabled(default 6.9-rc7), still larger than align anon 
reverted.

> cont-pte can get active if we're just lucky when allocating pages in the 
> right order, correct Ryan?