Re: [PATCH v14 007/138] mm: Add folio_put()

Mike Rapoport
2021-07-20T10:44:24Z

On Thu, Jul 15, 2021 at 04:34:53AM +0100, Matthew Wilcox (Oracle) wrote:
> If we know we have a folio, we can call folio_put() instead of put_page()
> and save the overhead of calling compound_head(). Also skips the
> devmap checks.
>
> This commit looks like it should be a no-op, but actually saves 684 bytes
> of text with the distro-derived config that I'm testing. Some functions
> grow a little while others shrink. I presume the compiler is making
> different inlining decisions.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Zi Yan <ziy@nvidia.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
> Reviewed-by: David Howells <dhowells@redhat.com>
> ---
> include/linux/mm.h | 33 ++++++++++++++++++++++++++++-----
> 1 file changed, 28 insertions(+), 5 deletions(-)

Acked-by: Mike Rapoport <rppt@linux.ibm.com>