From: Andrea Arcangeli <[email protected]> swapcache will reach the below code path in migrate_page_move_mapping, and swapcache is accounted as NR_FILE_PAGES but it's not accounted as NR_SHMEM.
This can make the NR_SHMEM counter underflow. Signed-off-by: Andrea Arcangeli <[email protected]> Reviewed-by: Minchan Kim <[email protected]> Acked-by: Mel Gorman <[email protected]> Cc: KOSAKI Motohiro <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- mm/migrate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN mm/migrate.c~mm-migratec-dont-account-swapcache-as-shmem mm/migrate.c --- a/mm/migrate.c~mm-migratec-dont-account-swapcache-as-shmem +++ a/mm/migrate.c @@ -288,7 +288,7 @@ static int migrate_page_move_mapping(str */ __dec_zone_page_state(page, NR_FILE_PAGES); __inc_zone_page_state(newpage, NR_FILE_PAGES); - if (PageSwapBacked(page)) { + if (mapping != &swapper_space && PageSwapBacked(page)) { __dec_zone_page_state(page, NR_SHMEM); __inc_zone_page_state(newpage, NR_SHMEM); } _ _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
