linux-kernel - Re: [PATCH v14 020/138] mm/filemap: Add __folio_lock

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Message-ID: <YPapM+LWhC7QKxsj@kernel.org>
Date:   Tue, 20 Jul 2021 13:45:07 +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>,
        Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>,
        David Howells <dhowells@...hat.com>
Subject: Re: [PATCH v14 020/138] mm/filemap: Add __folio_lock_async()

On Thu, Jul 15, 2021 at 04:35:06AM +0100, Matthew Wilcox (Oracle) wrote:
> There aren't any actual callers of lock_page_async(), so remove it.
> Convert filemap_update_page() to call __folio_lock_async().
> 
> __folio_lock_async() is 21 bytes smaller than __lock_page_async(),
> but the real savings come from using a folio in filemap_update_page(),
> shrinking it from 515 bytes to 404 bytes, saving 110 bytes.  The text
> shrinks by 132 bytes in total.
> 
> 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>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> Reviewed-by: David Howells <dhowells@...hat.com>
> ---
>  fs/io_uring.c           |  2 +-
>  include/linux/pagemap.h | 17 -----------------
>  mm/filemap.c            | 31 ++++++++++++++++---------------
>  3 files changed, 17 insertions(+), 33 deletions(-)

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