The patch titled
Subject: memcg: fix mapcount check in move charge code for anonymous page
has been added to the -mm tree. Its filename is
memcg-fix-mapcount-check-in-move-charge-code-for-anonymous-page.patch
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From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: memcg: fix mapcount check in move charge code for anonymous page
Currently the charge on shared anonyous pages is supposed not to moved in
task migration. To implement this, we need to check that mapcount > 1,
instread of > 2. So this patch fixes it.
Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Reviewed-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Hillf Danton <dhillf@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/memcontrol.c~memcg-fix-mapcount-check-in-move-charge-code-for-anonymous-page mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-fix-mapcount-check-in-move-charge-code-for-anonymous-page
+++ a/mm/memcontrol.c
@@ -5071,7 +5071,7 @@ static struct page *mc_handle_present_pt
return NULL;
if (PageAnon(page)) {
/* we don't move shared anon */
- if (!move_anon() || page_mapcount(page) > 2)
+ if (!move_anon() || page_mapcount(page) > 1)
return NULL;
} else if (!move_file())
/* we ignore mapcount for file pages */
_
Subject: Subject: memcg: fix mapcount check in move charge code for anonymous page
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
memcg-fix-mapcount-check-in-move-charge-code-for-anonymous-page.patch
pagemap-avoid-splitting-thp-when-reading-proc-pid-pagemap.patch
thp-optimize-away-unnecessary-page-table-locking.patch
thp-optimize-away-unnecessary-page-table-locking-fix.patch
thp-optimize-away-unnecessary-page-table-locking-fix-checkpatch-fixes.patch
pagemap-export-kpf_thp.patch
pagemap-document-kpf_thp-and-make-page-types-aware-of-it.patch
pagemap-introduce-data-structure-for-pagemap-entry.patch
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