From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> Subject: mm: thp: inc counter for collapsed shmem THP /sys/kernel/mm/transparent_hugepage/khugepaged/pages_collapsed is used to record the counter of collapsed THP, but it just gets inc'ed in anonymous THP collapse path, do this for shmem THP collapse too. Link: http://lkml.kernel.org/r/1529622949-75504-2-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx> Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/khugepaged.c~mm-thp-inc-counter-for-collapsed-shmem-thp +++ a/mm/khugepaged.c @@ -1516,6 +1516,8 @@ tree_unlocked: unlock_page(new_page); *hpage = NULL; + + khugepaged_pages_collapsed++; } else { /* Something went wrong: rollback changes to the radix-tree */ shmem_uncharge(mapping->host, nr_none); _
