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mm, slab: move memcg_cache_params structure to mm/slab.h

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The memcg_cache_params structure is only embedded into the kmem_cache of
slab and slub allocators as defined in slab_def.h and slub_def.h and used
internally by mm code.  There is no needed to expose it in a public
header.  So move it from include/linux/slab.h to mm/slab.h.  It is just a
refactoring patch with no code change.

In fact both the slub_def.h and slab_def.h should be moved into the mm
directory as well, but that will probably cause many merge conflicts.

Link: http://lkml.kernel.org/r/20190718180827.18758-1-longman@redhat.com
Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Waiman Long 2019-09-23 15:33:49 -07:00 • committed by Linus Torvalds
parent 04f768a39d
commit 9adeaa2269
2 changed files with 63 additions and 62 deletions
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62
include/linux/slab.h
View file

@ -595,68 +595,6 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
return __kmalloc_node(size, flags, node); return __kmalloc_node(size, flags, node);
} }
struct memcg_cache_array {
struct rcu_head rcu;
struct kmem_cache *entries[0];
};
/*
* This is the main placeholder for memcg-related information in kmem caches.
* Both the root cache and the child caches will have it. For the root cache,
* this will hold a dynamically allocated array large enough to hold
* information about the currently limited memcgs in the system. To allow the
* array to be accessed without taking any locks, on relocation we free the old
* version only after a grace period.
*
* Root and child caches hold different metadata.
*
* @root_cache: Common to root and child caches. NULL for root, pointer to
* the root cache for children.
*
* The following fields are specific to root caches.
*
* @memcg_caches: kmemcg ID indexed table of child caches. This table is
* used to index child cachces during allocation and cleared
* early during shutdown.
*
* @root_caches_node: List node for slab_root_caches list.
*
* @children: List of all child caches. While the child caches are also
* reachable through @memcg_caches, a child cache remains on
* this list until it is actually destroyed.
*
* The following fields are specific to child caches.
*
* @memcg: Pointer to the memcg this cache belongs to.
*
* @children_node: List node for @root_cache->children list.
*
* @kmem_caches_node: List node for @memcg->kmem_caches list.
*/
struct memcg_cache_params {
struct kmem_cache *root_cache;
union {
struct {
struct memcg_cache_array __rcu *memcg_caches;
struct list_head __root_caches_node;
struct list_head children;
bool dying;
};
struct {
struct mem_cgroup *memcg;
struct list_head children_node;
struct list_head kmem_caches_node;
struct percpu_ref refcnt;
void (*work_fn)(struct kmem_cache *);
union {
struct rcu_head rcu_head;
struct work_struct work;
};
};
};
};
int memcg_update_all_caches(int num_memcgs); int memcg_update_all_caches(int num_memcgs);
/** /**

63
mm/slab.h
View file

@ -30,6 +30,69 @@ struct kmem_cache {
struct list_head list; /* List of all slab caches on the system */ struct list_head list; /* List of all slab caches on the system */
}; };
#else /* !CONFIG_SLOB */
struct memcg_cache_array {
struct rcu_head rcu;
struct kmem_cache *entries[0];
};
/*
* This is the main placeholder for memcg-related information in kmem caches.
* Both the root cache and the child caches will have it. For the root cache,
* this will hold a dynamically allocated array large enough to hold
* information about the currently limited memcgs in the system. To allow the
* array to be accessed without taking any locks, on relocation we free the old
* version only after a grace period.
*
* Root and child caches hold different metadata.
*
* @root_cache: Common to root and child caches. NULL for root, pointer to
* the root cache for children.
*
* The following fields are specific to root caches.
*
* @memcg_caches: kmemcg ID indexed table of child caches. This table is
* used to index child cachces during allocation and cleared
* early during shutdown.
*
* @root_caches_node: List node for slab_root_caches list.
*
* @children: List of all child caches. While the child caches are also
* reachable through @memcg_caches, a child cache remains on
* this list until it is actually destroyed.
*
* The following fields are specific to child caches.
*
* @memcg: Pointer to the memcg this cache belongs to.
*
* @children_node: List node for @root_cache->children list.
*
* @kmem_caches_node: List node for @memcg->kmem_caches list.
*/
struct memcg_cache_params {
struct kmem_cache *root_cache;
union {
struct {
struct memcg_cache_array __rcu *memcg_caches;
struct list_head __root_caches_node;
struct list_head children;
bool dying;
};
struct {
struct mem_cgroup *memcg;
struct list_head children_node;
struct list_head kmem_caches_node;
struct percpu_ref refcnt;
void (*work_fn)(struct kmem_cache *);
union {
struct rcu_head rcu_head;
struct work_struct work;
};
};
};
};
#endif /* CONFIG_SLOB */ #endif /* CONFIG_SLOB */
#ifdef CONFIG_SLAB #ifdef CONFIG_SLAB