linux-kernel - Re: [PATCH v14 017/138] mm/filemap: Add folio

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Message-ID: <YPaomB3DcajZIH+D@kernel.org>
Date:   Tue, 20 Jul 2021 13:42:32 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        William Kucharski <william.kucharski@...cle.com>,
        David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v14 017/138] mm/filemap: Add folio_unlock()

On Thu, Jul 15, 2021 at 04:35:03AM +0100, 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@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Layton <jlayton@...nel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> Reviewed-by: David Howells <dhowells@...hat.com>
> ---
>  include/linux/pagemap.h |  3 ++-
>  mm/filemap.c            | 29 ++++++++++++-----------------
>  mm/folio-compat.c       |  6 ++++++
>  3 files changed, 20 insertions(+), 18 deletions(-)

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