diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-05-19 16:10:37 -0400 |
|---|---|---|
| committer | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-07-24 18:04:30 -0400 |
| commit | 4f66170119107f1452d2438ba4606e105e9e3afe (patch) | |
| tree | a73e91753ba11b83ac123911a3e89df18b4f1d6f /mm/readahead.c | |
| parent | ffc143db63eeea7c8a27deb3c56d090a220a1ace (diff) | |
filemap: Allow __filemap_get_folio to allocate large folios
Allow callers of __filemap_get_folio() to specify a preferred folio
order in the FGP flags. This is only honoured in the FGP_CREATE path;
if there is already a folio in the page cache that covers the index,
we will return it, no matter what its order is. No create-around is
attempted; we will only create folios which start at the specified index.
Unmodified callers will continue to allocate order 0 folios.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'mm/readahead.c')
| -rw-r--r-- | mm/readahead.c | 13 |
1 files changed, 0 insertions, 13 deletions
diff --git a/mm/readahead.c b/mm/readahead.c index a9c999aa19af..e815c114de21 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -461,19 +461,6 @@ static int try_context_readahead(struct address_space *mapping, return 1; } -/* - * There are some parts of the kernel which assume that PMD entries - * are exactly HPAGE_PMD_ORDER. Those should be fixed, but until then, - * limit the maximum allocation order to PMD size. I'm not aware of any - * assumptions about maximum order if THP are disabled, but 8 seems like - * a good order (that's 1MB if you're using 4kB pages) - */ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE -#define MAX_PAGECACHE_ORDER HPAGE_PMD_ORDER -#else -#define MAX_PAGECACHE_ORDER 8 -#endif - static inline int ra_alloc_folio(struct readahead_control *ractl, pgoff_t index, pgoff_t mark, unsigned int order, gfp_t gfp) { |