The patch titled
memcg: swapout refcnt fix
has been removed from the -mm tree. Its filename was
memcg-swapout-refcnt-fix.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: memcg: swapout refcnt fix
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
css's refcnt is dropped before end of following access.
Hold it until end of access.
Reported-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff -puN mm/memcontrol.c~memcg-swapout-refcnt-fix mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-swapout-refcnt-fix
+++ a/mm/memcontrol.c
@@ -1171,7 +1171,9 @@ __mem_cgroup_uncharge_common(struct page
mz = page_cgroup_zoneinfo(pc);
unlock_page_cgroup(pc);
- css_put(&mem->css);
+ /* at swapout, this memcg will be accessed to record to swap */
+ if (ctype != MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
+ css_put(&mem->css);
return mem;
@@ -1212,6 +1214,8 @@ void mem_cgroup_uncharge_swapcache(struc
swap_cgroup_record(ent, memcg);
mem_cgroup_get(memcg);
}
+ if (memcg)
+ css_put(&memcg->css);
}
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
origin.patch
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