From: Hugh Dickins Date: Tue, 29 May 2012 22:06:51 +0000 (-0700) Subject: memcg swap: mem_cgroup_move_swap_account never needs fixup X-Git-Tag: v5.15~22345^2~107 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=e91cbb42531626cd4fd0673ca01daf53e338d8f9;p=mirror_ubuntu-kernels.git memcg swap: mem_cgroup_move_swap_account never needs fixup The need_fixup arg to mem_cgroup_move_swap_account() is always false, so just remove it. Signed-off-by: Hugh Dickins Acked-by: KAMEZAWA Hiroyuki Cc: Daisuke Nishimura Acked-by: Johannes Weiner Cc: Michal Hocko Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e7db70f3d2d6..d5ba631e0ec7 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3165,7 +3165,6 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent) * @entry: swap entry to be moved * @from: mem_cgroup which the entry is moved from * @to: mem_cgroup which the entry is moved to - * @need_fixup: whether we should fixup res_counters and refcounts. * * It succeeds only when the swap_cgroup's record for this entry is the same * as the mem_cgroup's id of @from. @@ -3176,7 +3175,7 @@ void mem_cgroup_uncharge_swap(swp_entry_t ent) * both res and memsw, and called css_get(). */ static int mem_cgroup_move_swap_account(swp_entry_t entry, - struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) + struct mem_cgroup *from, struct mem_cgroup *to) { unsigned short old_id, new_id; @@ -3195,24 +3194,13 @@ static int mem_cgroup_move_swap_account(swp_entry_t entry, * swap-in, the refcount of @to might be decreased to 0. */ mem_cgroup_get(to); - if (need_fixup) { - if (!mem_cgroup_is_root(from)) - res_counter_uncharge(&from->memsw, PAGE_SIZE); - mem_cgroup_put(from); - /* - * we charged both to->res and to->memsw, so we should - * uncharge to->res. - */ - if (!mem_cgroup_is_root(to)) - res_counter_uncharge(&to->res, PAGE_SIZE); - } return 0; } return -EINVAL; } #else static inline int mem_cgroup_move_swap_account(swp_entry_t entry, - struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup) + struct mem_cgroup *from, struct mem_cgroup *to) { return -EINVAL; } @@ -5546,8 +5534,7 @@ put: /* get_mctgt_type() gets the page */ break; case MC_TARGET_SWAP: ent = target.ent; - if (!mem_cgroup_move_swap_account(ent, - mc.from, mc.to, false)) { + if (!mem_cgroup_move_swap_account(ent, mc.from, mc.to)) { mc.precharge--; /* we fixup refcnts and charges later. */ mc.moved_swap++;