Re: [PATCH v3] docs: update THP admin guide about non-tmpfs filesystem support

[Pankaj Raghav (Samsung)]

On Fri, Apr 04, 2025 at 09:16:10PM +0200, David Hildenbrand wrote:
> On 04.04.25 16:06, Pankaj Raghav (Samsung) wrote:
> > From: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
> > 
> > THP support for non-tmpfs filesystem has been around for some time now.
> > Update the admin guide to reflect it.
> > 
> > While we are at it, move FilePmdMapped to previous paragraph for clarity,
> > and clarify ShmemPmdMapped & ShmemHugePage.
> > 
> > Signed-off-by: Pankaj Raghav <p.raghav@xxxxxxxxxxx>
> > Acked-by: David Hildenbrand <david@xxxxxxxxxx>
> > ---
> 
> BTW, we should go over the whole document and bring it up to date.
> Interestingly, it starts with
> 
> "Performance critical computing applications dealing with large memory
> working sets are already running on top of libhugetlbfs and in turn
> hugetlbfs. Transparent HugePage Support (THP) is an alternative mean of
> using huge pages for the backing of virtual memory with huge pages
> that supports the automatic promotion and demotion of page sizes and
> without the shortcomings of hugetlbfs.
> 
> Currently THP only works for anonymous memory mappings and tmpfs/shmem.
> But in the future it can expand to other filesystems."

As a part of this patch, I do change 2nd paragraph:

-Currently THP only works for anonymous memory mappings and tmpfs/shmem.
-But in the future it can expand to other filesystems.
+Currently, THP only works for anonymous memory mappings, tmpfs/shmem and
+filesystems that support large folios.

Do we need to add more changes to the first paragraph as well?

--
Pankaj