lkml.org 
[lkml]   [2023]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH mm-unstable v2 1/6] mm: Add folio_estimated_mapcount()
    Date
    folio_estimated_mapcount() takes in a folio and calls page_mapcount() on
    the first page of that folio.

    This is necessary for folio conversions where we only care about either the
    entire_mapcount of a large folio, or the mapcount of a not large folio.

    This is in contrast to folio_mapcount() which calculates the total
    number of the times a folio and its subpages are mapped.

    Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
    ---
    include/linux/mm.h | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index c9db257f09b3..543c360f7ecc 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -875,6 +875,11 @@ static inline int page_mapcount(struct page *page)
    return mapcount;
    }

    +static inline int folio_estimated_mapcount(struct folio *folio)
    +{
    + return page_mapcount(folio_page(folio, 0));
    +}
    +
    int folio_total_mapcount(struct folio *folio);

    /**
    --
    2.38.1
    \
     
     \ /
      Last update: 2023-03-26 23:53    [W:4.584 / U:0.016 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site