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mm: memcg/slab: cache page number in memcg_(un)charge_slab() 

There are many places in memcg_charge_slab() and memcg_uncharge_slab()
which are calculating the number of pages to charge, css references to
grab etc depending on the order of the slab page.

Let's simplify the code by calculating it once and caching in the local
variable.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/20200109202659.752357-6-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
alistair/sensors
Roman Gushchin 2020-04-01 21:06:53 -07:00 committed by Linus Torvalds
parent 92d0510c35
commit 9c315e4d7d
1 changed files with 12 additions and 10 deletions
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22
mm/slab.h
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@ -348,6 +348,7 @@ static __always_inline int memcg_charge_slab(struct page *page,
gfp_t gfp, int order,
struct kmem_cache *s)
{
unsigned int nr_pages = 1 << order;
struct mem_cgroup *memcg;
struct lruvec *lruvec;
int ret;
@ -360,21 +361,21 @@ static __always_inline int memcg_charge_slab(struct page *page,
if (unlikely(!memcg || mem_cgroup_is_root(memcg))) {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
(1 << order));
percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
nr_pages);
percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages);
return 0;
}
ret = memcg_kmem_charge_memcg(memcg, gfp, 1 << order);
ret = memcg_kmem_charge_memcg(memcg, gfp, nr_pages);
if (ret)
goto out;
lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
mod_lruvec_state(lruvec, cache_vmstat_idx(s), 1 << order);
mod_lruvec_state(lruvec, cache_vmstat_idx(s), nr_pages);
/* transer try_charge() page references to kmem_cache */
percpu_ref_get_many(&s->memcg_params.refcnt, 1 << order);
css_put_many(&memcg->css, 1 << order);
percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages);
css_put_many(&memcg->css, nr_pages);
out:
css_put(&memcg->css);
return ret;
@ -387,6 +388,7 @@ out:
static __always_inline void memcg_uncharge_slab(struct page *page, int order,
struct kmem_cache *s)
{
unsigned int nr_pages = 1 << order;
struct mem_cgroup *memcg;
struct lruvec *lruvec;
@ -394,15 +396,15 @@ static __always_inline void memcg_uncharge_slab(struct page *page, int order,
memcg = READ_ONCE(s->memcg_params.memcg);
if (likely(!mem_cgroup_is_root(memcg))) {
lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
mod_lruvec_state(lruvec, cache_vmstat_idx(s), -(1 << order));
memcg_kmem_uncharge_memcg(memcg, order);
mod_lruvec_state(lruvec, cache_vmstat_idx(s), -nr_pages);
memcg_kmem_uncharge_memcg(memcg, nr_pages);
} else {
mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
-(1 << order));
-nr_pages);
}
rcu_read_unlock();
percpu_ref_put_many(&s->memcg_params.refcnt, 1 << order);
percpu_ref_put_many(&s->memcg_params.refcnt, nr_pages);
}
extern void slab_init_memcg_params(struct kmem_cache *);