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    Subject[PATCHv4 25/39] thp, mm: split huge page on mmap file page
    Date
    From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>

    We are not ready to mmap file-backed tranparent huge pages. Let's split
    them on fault attempt.

    Later in the patchset we'll implement mmap() properly and this code path
    be used for fallback cases.

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

    diff --git a/mm/filemap.c b/mm/filemap.c
    index ebd361a..9877347 100644
    --- a/mm/filemap.c
    +++ b/mm/filemap.c
    @@ -1700,6 +1700,8 @@ retry_find:
    goto no_cached_page;
    }

    + if (PageTransCompound(page))
    + split_huge_page(compound_trans_head(page));
    if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) {
    page_cache_release(page);
    return ret | VM_FAULT_RETRY;
    --
    1.7.10.4


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