Introduce a new mem_cgroup_kmem_disabled() helper, similar to
mem_cgroup_disabled(), to check whether the kernel memory accounting
is off. A user could disable it using a boot option to eliminate
some associated costs.
The helper can be used outside of memcontrol.c to dynamically disable
the kmem-related code. The returned value is stable after the kernel
initialization is finished.
Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
#endif
#ifdef CONFIG_MEMCG_KMEM
+bool mem_cgroup_kmem_disabled(void);
int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
void __memcg_kmem_uncharge_page(struct page *page, int order);
struct mem_cgroup *mem_cgroup_from_obj(void *p);
#else
+static inline bool mem_cgroup_kmem_disabled(void)
+{
+ return true;
+}
static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,
int order)
#ifdef CONFIG_MEMCG_KMEM
extern spinlock_t css_set_lock;
+bool mem_cgroup_kmem_disabled(void)
+{
+ return cgroup_memory_nokmem;
+}
+
static int __memcg_kmem_charge(struct mem_cgroup *memcg, gfp_t gfp,
unsigned int nr_pages);
static void __memcg_kmem_uncharge(struct mem_cgroup *memcg,