linux-kernel - Re: [PATCH v14 023/138] mm/swap: Add folio_rotate

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Date:   Tue, 20 Jul 2021 13:45:57 +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, Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>,
        Christoph Hellwig <hch@....de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v14 023/138] mm/swap: Add folio_rotate_reclaimable()

On Thu, Jul 15, 2021 at 04:35:09AM +0100, Matthew Wilcox (Oracle) wrote:
> Convert rotate_reclaimable_page() to folio_rotate_reclaimable().  This
> eliminates all five of the calls to compound_head() in this function,
> saving 75 bytes at the cost of adding 15 bytes to its one caller,
> end_page_writeback().  We also save 36 bytes from pagevec_move_tail_fn()
> due to using folios there.  Net 96 bytes savings.
> 
> Also move its declaration to mm/internal.h as it's only used by filemap.c.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  include/linux/swap.h |  1 -
>  mm/filemap.c         |  3 ++-
>  mm/internal.h        |  1 +
>  mm/page_io.c         |  4 ++--
>  mm/swap.c            | 30 ++++++++++++++++--------------
>  5 files changed, 21 insertions(+), 18 deletions(-)

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