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memcg swap: use mem_cgroup_uncharge_swap()

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That stuff __mem_cgroup_commit_charge_swapin() does with a swap entry, it
has a name and even a declaration: just use mem_cgroup_uncharge_swap().

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2012-05-29 15:06:52 -07:00 committed by Linus Torvalds
parent e91cbb4253
commit 86493009d3
1 changed files with 1 additions and 18 deletions
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19
mm/memcontrol.c
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@ -2855,24 +2855,7 @@ __mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *memcg,
*/
if (do_swap_account && PageSwapCache(page)) {
swp_entry_t ent = {.val = page_private(page)};
struct mem_cgroup *swap_memcg;
unsigned short id;
id = swap_cgroup_record(ent, 0);
rcu_read_lock();
swap_memcg = mem_cgroup_lookup(id);
if (swap_memcg) {
/*
* This recorded memcg can be obsolete one. So, avoid
* calling css_tryget
*/
if (!mem_cgroup_is_root(swap_memcg))
res_counter_uncharge(&swap_memcg->memsw,
PAGE_SIZE);
mem_cgroup_swap_statistics(swap_memcg, false);
mem_cgroup_put(swap_memcg);
}
rcu_read_unlock();
mem_cgroup_uncharge_swap(ent);
}
/*
* At swapin, we may charge account against cgroup which has no tasks.