Re: [PATCHSET v6 0/12] Uncached buffered IO

[Christoph Lameter (Ampere)]

On Tue, 3 Dec 2024, Jens Axboe wrote:

>
> So here's a new approach to the same concent, but using the page cache
> as synchronization. That makes RWF_UNCACHED less special, in that it's
> just page cache IO, except it prunes the ranges once IO is completed.


Great idea and someting that is really important these days.

However, one nit that I have is the use of the term "uncached" for a
folio/page. An uncached "page frame" refers to a page frame that requires
accesses not  going through the cpu cache. I.e. device mappings. This is
an established mm/cpu term as far as I can tell.

So maybe be a bit more specific about which cache this is?

PAGE_CACHE_UNCACHED?

or use a different term. It is cached after all but only for a brief
period. So this may be a "TEMPORAL_PAGE" or so? (Similar to the x86
"non-temporal" stores).