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    Subject[PATCH v13 135/137] mm/vmscan: Optimise shrink_page_list for smaller THPs
    Date
    A THP which is smaller than a PMD does not need to do the extra work
    in try_to_unmap() of trying to split a PMD entry.

    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    ---
    mm/vmscan.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index 8b17e46dbf32..433956675107 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -1496,7 +1496,8 @@ static unsigned int shrink_page_list(struct list_head *page_list,
    enum ttu_flags flags = TTU_BATCH_FLUSH;
    bool was_swapbacked = PageSwapBacked(page);

    - if (unlikely(PageTransHuge(page)))
    + if (PageTransHuge(page) &&
    + thp_order(page) >= HPAGE_PMD_ORDER)
    flags |= TTU_SPLIT_HUGE_PMD;

    try_to_unmap(page, flags);
    --
    2.30.2
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