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Date: Tue, 13 Apr 2021 21:20:24 -0400
From: Waiman Long <longman@...hat.com>
To: Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Vladimir Davydov <vdavydov.dev@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Vlastimil Babka <vbabka@...e.cz>, Roman Gushchin <guro@...com>
Cc: linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>,
Muchun Song <songmuchun@...edance.com>,
Alex Shi <alex.shi@...ux.alibaba.com>,
Chris Down <chris@...isdown.name>,
Yafang Shao <laoar.shao@...il.com>,
Wei Yang <richard.weiyang@...il.com>,
Masayoshi Mizuma <msys.mizuma@...il.com>,
Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
Waiman Long <longman@...hat.com>
Subject: [PATCH v3 2/5] mm/memcg: Introduce obj_cgroup_uncharge_mod_state()
In memcg_slab_free_hook()/pcpu_memcg_free_hook(), obj_cgroup_uncharge()
is followed by mod_objcg_state()/mod_memcg_state(). Each of these
function call goes through a separate irq_save/irq_restore cycle. That
is inefficient. Introduce a new function obj_cgroup_uncharge_mod_state()
that combines them with a single irq_save/irq_restore cycle.
Signed-off-by: Waiman Long <longman@...hat.com>
Reviewed-by: Shakeel Butt <shakeelb@...gle.com>
Acked-by: Roman Gushchin <guro@...com>
---
include/linux/memcontrol.h | 2 ++
mm/memcontrol.c | 31 +++++++++++++++++++++++++++----
mm/percpu.c | 9 ++-------
mm/slab.h | 6 +++---
4 files changed, 34 insertions(+), 14 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 95f12996e66c..6890f999c1a3 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1592,6 +1592,8 @@ struct obj_cgroup *get_obj_cgroup_from_current(void);
int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size);
void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size);
+void obj_cgroup_uncharge_mod_state(struct obj_cgroup *objcg, size_t size,
+ struct pglist_data *pgdat, int idx);
extern struct static_key_false memcg_kmem_enabled_key;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d66e1e38f8ac..b19100c68aa0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3225,12 +3225,9 @@ static bool obj_stock_flush_required(struct memcg_stock_pcp *stock,
return false;
}
-static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
+static void __refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
{
struct memcg_stock_pcp *stock;
- unsigned long flags;
-
- local_irq_save(flags);
stock = this_cpu_ptr(&memcg_stock);
if (stock->cached_objcg != objcg) { /* reset if necessary */
@@ -3243,7 +3240,14 @@ static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
if (stock->nr_bytes > PAGE_SIZE)
drain_obj_stock(stock);
+}
+
+static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes)
+{
+ unsigned long flags;
+ local_irq_save(flags);
+ __refill_obj_stock(objcg, nr_bytes);
local_irq_restore(flags);
}
@@ -3292,6 +3296,25 @@ void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size)
refill_obj_stock(objcg, size);
}
+void obj_cgroup_uncharge_mod_state(struct obj_cgroup *objcg, size_t size,
+ struct pglist_data *pgdat, int idx)
+{
+ unsigned long flags;
+ struct mem_cgroup *memcg;
+ struct lruvec *lruvec = NULL;
+
+ local_irq_save(flags);
+ __refill_obj_stock(objcg, size);
+
+ rcu_read_lock();
+ memcg = obj_cgroup_memcg(objcg);
+ if (pgdat)
+ lruvec = mem_cgroup_lruvec(memcg, pgdat);
+ __mod_memcg_lruvec_state(memcg, lruvec, idx, -(int)size);
+ rcu_read_unlock();
+ local_irq_restore(flags);
+}
+
#endif /* CONFIG_MEMCG_KMEM */
/*
diff --git a/mm/percpu.c b/mm/percpu.c
index 23308113a5ff..fd7aad6d7f90 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1631,13 +1631,8 @@ static void pcpu_memcg_free_hook(struct pcpu_chunk *chunk, int off, size_t size)
objcg = chunk->obj_cgroups[off >> PCPU_MIN_ALLOC_SHIFT];
chunk->obj_cgroups[off >> PCPU_MIN_ALLOC_SHIFT] = NULL;
- obj_cgroup_uncharge(objcg, size * num_possible_cpus());
-
- rcu_read_lock();
- mod_memcg_state(obj_cgroup_memcg(objcg), MEMCG_PERCPU_B,
- -(size * num_possible_cpus()));
- rcu_read_unlock();
-
+ obj_cgroup_uncharge_mod_state(objcg, size * num_possible_cpus(),
+ NULL, MEMCG_PERCPU_B);
obj_cgroup_put(objcg);
}
diff --git a/mm/slab.h b/mm/slab.h
index bc6c7545e487..677cdc52e641 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -366,9 +366,9 @@ static inline void memcg_slab_free_hook(struct kmem_cache *s_orig,
continue;
objcgs[off] = NULL;
- obj_cgroup_uncharge(objcg, obj_full_size(s));
- mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s),
- -obj_full_size(s));
+ obj_cgroup_uncharge_mod_state(objcg, obj_full_size(s),
+ page_pgdat(page),
+ cache_vmstat_idx(s));
obj_cgroup_put(objcg);
}
}
--
2.18.1
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