Re: [PATCH 5/8] x86/clear_page: add clear_page_uncached()

[Ankur Arora]

On 2020-10-15 3:35 a.m., Borislav Petkov wrote:
> On Wed, Oct 14, 2020 at 08:37:44PM -0700, Ankur Arora wrote:
> > I don't disagree but I think the selection of cached/uncached route should
> > be made where we have enough context available to be able to choose to do
> > this.
> >
> > This could be for example, done in mm_populate() or gup where if say the
> > extent is larger than LLC-size, it takes the uncached path.
>
> Are there examples where we don't know the size?

The case I was thinking of was that clear_huge_page() or faultin_page() would
know the size to a page unit, while the higher level function would know the
whole extent and could optimize differently based on that.

Thanks
Ankur

>