Re: [PATCH v14 017/138] mm/filemap: Add folio_unlock()

From: Vlastimil Babka
Date: Tue Aug 10 2021 - 12:04:39 EST

On 7/15/21 5:35 AM, Matthew Wilcox (Oracle) wrote:
> Convert unlock_page() to call folio_unlock(). By using a folio we
> avoid a call to compound_head(). This shortens the function from 39
> bytes to 25 and removes 4 instructions on x86-64. Because we still
> have unlock_page(), it's a net increase of 16 bytes of text for the
> kernel as a whole, but any path that uses folio_unlock() will execute
> 4 fewer instructions.
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Jeff Layton <jlayton@xxxxxxxxxx>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
> Reviewed-by: David Howells <dhowells@xxxxxxxxxx>

Acked-by: Vlastimil Babka <vbabka@xxxxxxx>