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authorHugh Dickins <hughd@google.com>2019-04-18 17:49:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-04-19 09:46:04 -0700
commit87039546544479d4bedb19d0ea525270c43c1c9b (patch)
tree0520eeb66e4c3d8fa9e80f7b0b42fbaa4f8fd90b
parent1a62b18d51e5c5ecc0345c85bb9fef870ab721ed (diff)
downloadlinux-sh-87039546544479d4bedb19d0ea525270c43c1c9b.tar.gz
mm: swapoff: shmem_find_swap_entries() filter out other types
Swapfile "type" was passed all the way down to shmem_unuse_inode(), but then forgotten from shmem_find_swap_entries(): with the result that removing one swapfile would try to free up all the swap from shmem - no problem when only one swapfile anyway, but counter-productive when more, causing swapoff to be unnecessarily OOM-killed when it should succeed. Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1904081254470.1523@eggly.anvils Fixes: b56a2d8af914 ("mm: rid swapoff of quadratic complexity") Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Cc: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca> Cc: Vineeth Pillai <vpillai@digitalocean.com> Cc: Kelley Nielsen <kelleynnn@gmail.com> Cc: Rik van Riel <riel@surriel.com> Cc: Huang Ying <ying.huang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/shmem.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index b3db3779a30a..859e8628071f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1099,10 +1099,11 @@ extern struct swap_info_struct *swap_info[];
static int shmem_find_swap_entries(struct address_space *mapping,
pgoff_t start, unsigned int nr_entries,
struct page **entries, pgoff_t *indices,
- bool frontswap)
+ unsigned int type, bool frontswap)
{
XA_STATE(xas, &mapping->i_pages, start);
struct page *page;
+ swp_entry_t entry;
unsigned int ret = 0;
if (!nr_entries)
@@ -1116,13 +1117,12 @@ static int shmem_find_swap_entries(struct address_space *mapping,
if (!xa_is_value(page))
continue;
- if (frontswap) {
- swp_entry_t entry = radix_to_swp_entry(page);
-
- if (!frontswap_test(swap_info[swp_type(entry)],
- swp_offset(entry)))
- continue;
- }
+ entry = radix_to_swp_entry(page);
+ if (swp_type(entry) != type)
+ continue;
+ if (frontswap &&
+ !frontswap_test(swap_info[type], swp_offset(entry)))
+ continue;
indices[ret] = xas.xa_index;
entries[ret] = page;
@@ -1194,7 +1194,7 @@ static int shmem_unuse_inode(struct inode *inode, unsigned int type,
pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries,
pvec.pages, indices,
- frontswap);
+ type, frontswap);
if (pvec.nr == 0) {
ret = 0;
break;