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| author | Andrea Arcangeli <aarcange@redhat.com> | 2011-06-16 12:56:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-06-16 15:01:24 -0700 |
| commit | 99a15e21d96f6857dafab1e5167e5e8183215c9c (patch) | |
| tree | eb6224c0bf11fc243de298c3fa665e418f849d16 | |
| parent | 7cc2ed05891f424c2e323bc1a368ddb5c78b90f2 (diff) | |
| download | linux-99a15e21d96f6857dafab1e5167e5e8183215c9c.tar.gz linux-99a15e21d96f6857dafab1e5167e5e8183215c9c.tar.bz2 linux-99a15e21d96f6857dafab1e5167e5e8183215c9c.zip | |
migrate: don't account swapcache as shmem
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.
Hugh pointed out we must use PageSwapCache instead of comparing
mapping to &swapper_space, to avoid build failure with CONFIG_SWAP=n.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index e4a5c912983d..666e4e677414 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 (!PageSwapCache(page) && PageSwapBacked(page)) { __dec_zone_page_state(page, NR_SHMEM); __inc_zone_page_state(newpage, NR_SHMEM); } |