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mm: memcontrol: fix memcg id ref counter on swap charge move
Since commit73f576c04b
("mm: memcontrol: fix cgroup creation failure after many small jobs") swap entries do not pin memcg->css.refcnt directly. Instead, they pin memcg->id.ref. So we should adjust the reference counters accordingly when moving swap charges between cgroups. Fixes:73f576c04b
("mm: memcontrol: fix cgroup creation failure after many small jobs") Link: http://lkml.kernel.org/r/9ce297c64954a42dc90b543bc76106c4a94f07e8.1470219853.git.vdavydov@virtuozzo.com Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: <stable@vger.kernel.org> [3.19+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
1f47b61fb4
commit
615d66c37c
@ -4077,9 +4077,9 @@ static struct cftype mem_cgroup_legacy_files[] = {
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static DEFINE_IDR(mem_cgroup_idr);
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static void mem_cgroup_id_get(struct mem_cgroup *memcg)
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static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n)
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{
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atomic_inc(&memcg->id.ref);
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atomic_add(n, &memcg->id.ref);
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}
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static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
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@ -4100,9 +4100,9 @@ static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
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return memcg;
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}
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static void mem_cgroup_id_put(struct mem_cgroup *memcg)
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static void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n)
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{
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if (atomic_dec_and_test(&memcg->id.ref)) {
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if (atomic_sub_and_test(n, &memcg->id.ref)) {
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idr_remove(&mem_cgroup_idr, memcg->id.id);
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memcg->id.id = 0;
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@ -4111,6 +4111,16 @@ static void mem_cgroup_id_put(struct mem_cgroup *memcg)
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}
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}
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static inline void mem_cgroup_id_get(struct mem_cgroup *memcg)
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{
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mem_cgroup_id_get_many(memcg, 1);
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}
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static inline void mem_cgroup_id_put(struct mem_cgroup *memcg)
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{
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mem_cgroup_id_put_many(memcg, 1);
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}
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/**
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* mem_cgroup_from_id - look up a memcg from a memcg id
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* @id: the memcg id to look up
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@ -4745,6 +4755,8 @@ static void __mem_cgroup_clear_mc(void)
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if (!mem_cgroup_is_root(mc.from))
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page_counter_uncharge(&mc.from->memsw, mc.moved_swap);
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mem_cgroup_id_put_many(mc.from, mc.moved_swap);
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/*
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* we charged both to->memory and to->memsw, so we
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* should uncharge to->memory.
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@ -4752,9 +4764,9 @@ static void __mem_cgroup_clear_mc(void)
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if (!mem_cgroup_is_root(mc.to))
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page_counter_uncharge(&mc.to->memory, mc.moved_swap);
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css_put_many(&mc.from->css, mc.moved_swap);
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mem_cgroup_id_get_many(mc.to, mc.moved_swap);
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css_put_many(&mc.to->css, mc.moved_swap);
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/* we've already done css_get(mc.to) */
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mc.moved_swap = 0;
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}
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memcg_oom_recover(from);
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