mm: thp: register mm for khugepaged when merging vma for shmem
When merging anonymous page vma, if the size of the vma can fit in at least one hugepage, the mm will be registered for khugepaged for collapsing THP in the future. But it skips shmem vmas. Do so for shmem also, but not for file-private mappings when merging a vma in order to increase the odds of collapsing a hugepage via khugepaged. hugepage_vma_check() sounds like a good fit to do the check. And move the definition of it before khugepaged_enter_vma_merge() to avoid a build error. Link: http://lkml.kernel.org/r/1529697791-6950-1-git-send-email-yang.shi@linux.alibaba.comSigned-off-by: Yang Shi <yang.shi@linux.alibaba.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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