memcg: unify slab and other kmem pages charging

We have memcg_kmem_charge and memcg_kmem_uncharge methods for charging and
uncharging kmem pages to memcg, but currently they are not used for
charging slab pages (i.e.  they are only used for charging pages allocated
with alloc_kmem_pages).  The only reason why the slab subsystem uses
special helpers, memcg_charge_slab and memcg_uncharge_slab, is that it
needs to charge to the memcg of kmem cache while memcg_charge_kmem charges
to the memcg that the current task belongs to.

To remove this diversity, this patch adds an extra argument to
__memcg_kmem_charge that can be a pointer to a memcg or NULL.  If it is
not NULL, the function tries to charge to the memcg it points to,
otherwise it charge to the current context.  Next, it makes the slab
subsystem use this function to charge slab pages.

Since memcg_charge_kmem and memcg_uncharge_kmem helpers are now used only
in __memcg_kmem_charge and __memcg_kmem_uncharge, they are inlined.  Since
__memcg_kmem_charge stores a pointer to the memcg in the page struct, we
don't need memcg_uncharge_slab anymore and can use free_kmem_pages.
Besides, one can now detect which memcg a slab page belongs to by reading
/proc/kpagecgroup.

Note, this patch switches slab to charge-after-alloc design.  Since this
design is already used for all other memcg charges, it should not make any
difference.

[hannes@cmpxchg.org: better to have an outer function than a magic parameter for the memcg lookup]
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 17 deletions

diff --git a/mm/slab.h b/mm/slab.h
index bf51a8d..27492eb 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -236,23 +236,16 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
 	return s->memcg_params.root_cache;
 }
 
-static __always_inline int memcg_charge_slab(struct kmem_cache *s,
-					     gfp_t gfp, int order)
+static __always_inline int memcg_charge_slab(struct page *page,
+					     gfp_t gfp, int order,
+					     struct kmem_cache *s)
 {
 	if (!memcg_kmem_enabled())
 		return 0;
 	if (is_root_cache(s))
 		return 0;
-	return memcg_charge_kmem(s->memcg_params.memcg, gfp, 1 << order);
-}
-
-static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
-{
-	if (!memcg_kmem_enabled())
-		return;
-	if (is_root_cache(s))
-		return;
-	memcg_uncharge_kmem(s->memcg_params.memcg, 1 << order);
+	return __memcg_kmem_charge_memcg(page, gfp, order,
+					 s->memcg_params.memcg);
 }
 
 extern void slab_init_memcg_params(struct kmem_cache *);
@@ -289,15 +282,12 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
 	return s;
 }
 
-static inline int memcg_charge_slab(struct kmem_cache *s, gfp_t gfp, int order)
+static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
+				    struct kmem_cache *s)
 {
 	return 0;
 }
 
-static inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
-{
-}
-
 static inline void slab_init_memcg_params(struct kmem_cache *s)
 {
 }