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    Subject[PATCHv3 13/29] thp: handle file pages in split_huge_pmd()
    Date
    Splitting THP PMD is simple: just unmap it as in DAX case.
    Unlike DAX, we also remove the page from rmap and drop reference.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    mm/huge_memory.c | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    diff --git a/mm/huge_memory.c b/mm/huge_memory.c
    index 15704484abf4..985041c453bf 100644
    --- a/mm/huge_memory.c
    +++ b/mm/huge_memory.c
    @@ -2900,10 +2900,16 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd,

    count_vm_event(THP_SPLIT_PMD);

    - if (vma_is_dax(vma)) {
    - pmd_t _pmd = pmdp_huge_clear_flush_notify(vma, haddr, pmd);
    + if (!vma_is_anonymous(vma)) {
    + _pmd = pmdp_huge_clear_flush_notify(vma, haddr, pmd);
    if (is_huge_zero_pmd(_pmd))
    put_huge_zero_page();
    + if (vma_is_dax(vma))
    + return;
    + page = pmd_page(_pmd);
    + page_remove_rmap(page, true);
    + put_page(page);
    + add_mm_counter(mm, MM_FILEPAGES, -HPAGE_PMD_NR);
    return;
    } else if (is_huge_zero_pmd(*pmd)) {
    return __split_huge_zero_page_pmd(vma, haddr, pmd);
    --
    2.7.0
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