The patch titled
Subject: mm: fontswap: thp fix
has been added to the -mm tree. Its filename is
fontswap-thp-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/fontswap-thp-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/fontswap-thp-fix.patch
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The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Huang Ying <huang.ying.caritas@xxxxxxxxx>
Subject: mm: fontswap: thp fix
Link: http://lkml.kernel.org/r/87d11j4pdy.fsf@xxxxxxxxxxxxxxxxxxxx
Fixes: bd4c82c22c367e068 ("mm, THP, swap: delay splitting THP after swapped out")
Reported-by: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 2 +-
mm/vmscan.c | 16 +++++++++++++---
2 files changed, 14 insertions(+), 4 deletions(-)
diff -puN mm/page_io.c~fontswap-thp-fix mm/page_io.c
--- a/mm/page_io.c~fontswap-thp-fix
+++ a/mm/page_io.c
@@ -250,7 +250,7 @@ int swap_writepage(struct page *page, st
unlock_page(page);
goto out;
}
- if (frontswap_store(page) == 0) {
+ if (!PageTransHuge(page) && frontswap_store(page) == 0) {
set_page_writeback(page);
unlock_page(page);
end_page_writeback(page);
diff -puN mm/vmscan.c~fontswap-thp-fix mm/vmscan.c
--- a/mm/vmscan.c~fontswap-thp-fix
+++ a/mm/vmscan.c
@@ -55,6 +55,7 @@
#include <linux/swapops.h>
#include <linux/balloon_compaction.h>
+#include <linux/frontswap.h>
#include "internal.h"
@@ -1121,13 +1122,22 @@ static unsigned long shrink_page_list(st
if (!can_split_huge_page(page, NULL))
goto activate_locked;
/*
+ * Split THP if frontswap enabled,
+ * because it cannot process THP
+ */
+ if (frontswap_enabled()) {
+ if (split_huge_page_to_list(
+ page, page_list))
+ goto activate_locked;
+ }
+ /*
* Split pages without a PMD map right
* away. Chances are some or all of the
* tail pages can be freed without IO.
*/
- if (!compound_mapcount(page) &&
- split_huge_page_to_list(page,
- page_list))
+ else if (!compound_mapcount(page) &&
+ split_huge_page_to_list(page,
+ page_list))
goto activate_locked;
}
if (!add_to_swap(page)) {
_
Patches currently in -mm which might be from huang.ying.caritas@xxxxxxxxx are
fontswap-thp-fix.patch
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