On Wed, May 29, 2019 at 02:20:48PM -0700, Song Liu wrote: > Instead of splitting the compound page with FOLL_SPLIT, this patch allows > uprobe to only split pmd for huge pages. > > A helper function mm_address_trans_huge(mm, address) was introduced to > test whether the address in mm is pointing to THP. Maybe it would be cleaner to have FOLL_SPLIT_PMD which would strip trans_huge PMD if any and then set pte using get_locked_pte()? This way you'll not need any changes in split_huge_pmd() path. Clearing PMD will be fine. -- Kirill A. Shutemov
