[PATCH RFC -mm v2 2/3] memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab
From: Vladimir Davydov
Date: Fri Apr 18 2014 - 04:05:30 EST
Currently we have two pairs of kmemcg-related functions that are called
on slab alloc/free. The first is memcg_{bind,release}_pages that count
the total number of pages allocated on a kmem cache. The second is
memcg_{un}charge_slab that {un}charge slab pages to kmemcg resource
counter. Let's just merge them to keep the code clean.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 4 ++--
mm/memcontrol.c | 22 ++++++++++++++++++++--
mm/slab.c | 2 --
mm/slab.h | 25 ++-----------------------
mm/slub.c | 2 --
5 files changed, 24 insertions(+), 31 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 087a45314181..d38d190f4cec 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -506,8 +506,8 @@ void memcg_update_array_size(int num_groups);
struct kmem_cache *
__memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp);
-int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size);
-void memcg_uncharge_kmem(struct mem_cgroup *memcg, u64 size);
+int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order);
+void __memcg_uncharge_slab(struct kmem_cache *cachep, int order);
int __kmem_cache_destroy_memcg_children(struct kmem_cache *s);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 81ecb0de95dd..5221347b0e1b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2944,7 +2944,7 @@ static int mem_cgroup_slabinfo_read(struct seq_file *m, void *v)
}
#endif
-int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
+static int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
{
struct res_counter *fail_res;
int ret = 0;
@@ -2982,7 +2982,7 @@ int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, u64 size)
return ret;
}
-void memcg_uncharge_kmem(struct mem_cgroup *memcg, u64 size)
+static void memcg_uncharge_kmem(struct mem_cgroup *memcg, u64 size)
{
res_counter_uncharge(&memcg->res, size);
if (do_swap_account)
@@ -3380,6 +3380,24 @@ static void memcg_create_cache_enqueue(struct mem_cgroup *memcg,
__memcg_create_cache_enqueue(memcg, cachep);
memcg_resume_kmem_account();
}
+
+int __memcg_charge_slab(struct kmem_cache *cachep, gfp_t gfp, int order)
+{
+ int res;
+
+ res = memcg_charge_kmem(cachep->memcg_params->memcg, gfp,
+ PAGE_SIZE << order);
+ if (!res)
+ atomic_add(1 << order, &cachep->memcg_params->nr_pages);
+ return res;
+}
+
+void __memcg_uncharge_slab(struct kmem_cache *cachep, int order)
+{
+ memcg_uncharge_kmem(cachep->memcg_params->memcg, PAGE_SIZE << order);
+ atomic_sub(1 << order, &cachep->memcg_params->nr_pages);
+}
+
/*
* Return the kmem_cache we're supposed to use for a slab allocation.
* We try to use the current memcg's version of the cache.
diff --git a/mm/slab.c b/mm/slab.c
index cbcd2fa7af2f..fa28f86ac16f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1706,7 +1706,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
__SetPageSlab(page);
if (page->pfmemalloc)
SetPageSlabPfmemalloc(page);
- memcg_bind_pages(cachep, cachep->gfporder);
if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK)) {
kmemcheck_alloc_shadow(page, cachep->gfporder, flags, nodeid);
@@ -1742,7 +1741,6 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
page_mapcount_reset(page);
page->mapping = NULL;
- memcg_release_pages(cachep, cachep->gfporder);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += nr_freed;
__free_pages(page, cachep->gfporder);
diff --git a/mm/slab.h b/mm/slab.h
index efe14d420010..11eb623f0e61 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -119,18 +119,6 @@ static inline bool is_root_cache(struct kmem_cache *s)
return !s->memcg_params || s->memcg_params->is_root_cache;
}
-static inline void memcg_bind_pages(struct kmem_cache *s, int order)
-{
- if (!is_root_cache(s))
- atomic_add(1 << order, &s->memcg_params->nr_pages);
-}
-
-static inline void memcg_release_pages(struct kmem_cache *s, int order)
-{
- if (!is_root_cache(s))
- atomic_sub(1 << order, &s->memcg_params->nr_pages);
-}
-
static inline bool slab_equal_or_root(struct kmem_cache *s,
struct kmem_cache *p)
{
@@ -196,8 +184,7 @@ static __always_inline int memcg_charge_slab(struct kmem_cache *s,
return 0;
if (is_root_cache(s))
return 0;
- return memcg_charge_kmem(s->memcg_params->memcg, gfp,
- PAGE_SIZE << order);
+ return __memcg_charge_slab(s, gfp, order);
}
static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
@@ -206,7 +193,7 @@ static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
return;
if (is_root_cache(s))
return;
- memcg_uncharge_kmem(s->memcg_params->memcg, PAGE_SIZE << order);
+ __memcg_uncharge_slab(s, order);
}
#else
static inline bool is_root_cache(struct kmem_cache *s)
@@ -214,14 +201,6 @@ static inline bool is_root_cache(struct kmem_cache *s)
return true;
}
-static inline void memcg_bind_pages(struct kmem_cache *s, int order)
-{
-}
-
-static inline void memcg_release_pages(struct kmem_cache *s, int order)
-{
-}
-
static inline bool slab_equal_or_root(struct kmem_cache *s,
struct kmem_cache *p)
{
diff --git a/mm/slub.c b/mm/slub.c
index fa7a1817835e..c17d8b9975be 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1427,7 +1427,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
order = compound_order(page);
inc_slabs_node(s, page_to_nid(page), page->objects);
- memcg_bind_pages(s, order);
page->slab_cache = s;
__SetPageSlab(page);
if (page->pfmemalloc)
@@ -1478,7 +1477,6 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
__ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page);
- memcg_release_pages(s, order);
page_mapcount_reset(page);
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
--
1.7.10.4
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