On Fri, Jun 03, 2011 at 03:49:41PM +0100, Mel Gorman wrote: > Right idea of the wrong zone being accounted for but wrong place. I > think the following patch should fix the problem;
Looks good thanks. I also found this bug during my debugging that made NR_SHMEM underflow. === Subject: migrate: don't account swapcache as shmem 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. Signed-off-by: Andrea Arcangeli <[email protected]> --- diff --git a/mm/migrate.c b/mm/migrate.c index e4a5c91..2597a27 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -288,7 +288,7 @@ static int migrate_page_move_mapping(struct address_space *mapping, */ __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
