Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> wrote:
> Some filesystems benefit from being able to map the entire folio.
> On 32-bit platforms with HIGHMEM, we fall back to using vmap, which
> will be slow. If it proves to be a performance problem, we can look at
> optimising it in a number of ways.
Here's a thought: If a highmem arch has a huge PTEs available, can you create
a huge PTE to cover the folio?
> @@ -426,5 +465,4 @@ static inline void folio_zero_range(struct folio *folio,
> {
> zero_user_segments(&folio->page, start, start + length, 0, 0);
> }
> -
> #endif /* _LINUX_HIGHMEM_H */
Did you want to remove that blank line?
David
