slab: embed memcg_cache_params to kmem_cache
Currently, kmem_cache stores a pointer to struct memcg_cache_params
instead of embedding it. The rationale is to save memory when kmem
accounting is disabled. However, the memcg_cache_params has shrivelled
drastically since it was first introduced:
* Initially:
struct memcg_cache_params {
bool is_root_cache;
union {
struct kmem_cache *memcg_caches[0];
struct {
struct mem_cgroup *memcg;
struct list_head list;
struct kmem_cache *root_cache;
bool dead;
atomic_t nr_pages;
struct work_struct destroy;
};
};
};
* Now:
struct memcg_cache_params {
bool is_root_cache;
union {
struct {
struct rcu_head rcu_head;
struct kmem_cache *memcg_caches[0];
};
struct {
struct mem_cgroup *memcg;
struct kmem_cache *root_cache;
};
};
};
So the memory saving does not seem to be a clear win anymore.
OTOH, keeping a pointer to memcg_cache_params struct instead of embedding
it results in touching one more cache line on kmem alloc/free hot paths.
Besides, it makes linking kmem caches in a list chained by a field of
struct memcg_cache_params really painful due to a level of indirection,
while I want to make them linked in the following patch. That said, let
us embed it.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Tejun Heo <tj@kernel.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>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Davydov
Linus Torvalds
Родитель
49e7e7ff8d
Коммит
f7ce3190c4
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|
@ -473,14 +473,14 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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#ifndef ARCH_SLAB_MINALIGN
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#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
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#endif
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struct memcg_cache_array {
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struct rcu_head rcu;
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struct kmem_cache *entries[0];
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};
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/*
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* This is the main placeholder for memcg-related information in kmem caches.
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* struct kmem_cache will hold a pointer to it, so the memory cost while
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* disabled is 1 pointer. The runtime cost while enabled, gets bigger than it
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* would otherwise be if that would be bundled in kmem_cache: we'll need an
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* extra pointer chase. But the trade off clearly lays in favor of not
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* penalizing non-users.
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*
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* Both the root cache and the child caches will have it. For the root cache,
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* this will hold a dynamically allocated array large enough to hold
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* information about the currently limited memcgs in the system. To allow the
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|
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@ -495,10 +495,7 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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struct memcg_cache_params {
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bool is_root_cache;
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union {
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struct {
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struct rcu_head rcu_head;
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struct kmem_cache *memcg_caches[0];
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};
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struct memcg_cache_array __rcu *memcg_caches;
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struct {
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struct mem_cgroup *memcg;
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struct kmem_cache *root_cache;
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|
|
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|
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@ -70,7 +70,7 @@ struct kmem_cache {
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int obj_offset;
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#endif /* CONFIG_DEBUG_SLAB */
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#ifdef CONFIG_MEMCG_KMEM
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struct memcg_cache_params *memcg_params;
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struct memcg_cache_params memcg_params;
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#endif
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struct kmem_cache_node *node[MAX_NUMNODES];
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|
|
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|
|
@ -85,7 +85,7 @@ struct kmem_cache {
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struct kobject kobj; /* For sysfs */
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#endif
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#ifdef CONFIG_MEMCG_KMEM
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struct memcg_cache_params *memcg_params;
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struct memcg_cache_params memcg_params;
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int max_attr_size; /* for propagation, maximum size of a stored attr */
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#ifdef CONFIG_SYSFS
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struct kset *memcg_kset;
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|
|
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@ -332,7 +332,7 @@ struct mem_cgroup {
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struct cg_proto tcp_mem;
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#endif
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#if defined(CONFIG_MEMCG_KMEM)
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/* Index in the kmem_cache->memcg_params->memcg_caches array */
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/* Index in the kmem_cache->memcg_params.memcg_caches array */
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int kmemcg_id;
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#endif
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@ -531,7 +531,7 @@ static void disarm_sock_keys(struct mem_cgroup *memcg)
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#ifdef CONFIG_MEMCG_KMEM
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/*
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* This will be the memcg's index in each cache's ->memcg_params->memcg_caches.
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* This will be the memcg's index in each cache's ->memcg_params.memcg_caches.
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* The main reason for not using cgroup id for this:
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* this works better in sparse environments, where we have a lot of memcgs,
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* but only a few kmem-limited. Or also, if we have, for instance, 200
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|
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@ -2667,8 +2667,7 @@ struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep)
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struct mem_cgroup *memcg;
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struct kmem_cache *memcg_cachep;
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VM_BUG_ON(!cachep->memcg_params);
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VM_BUG_ON(!cachep->memcg_params->is_root_cache);
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VM_BUG_ON(!is_root_cache(cachep));
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if (current->memcg_kmem_skip_account)
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return cachep;
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@ -2702,7 +2701,7 @@ out:
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void __memcg_kmem_put_cache(struct kmem_cache *cachep)
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{
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if (!is_root_cache(cachep))
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css_put(&cachep->memcg_params->memcg->css);
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css_put(&cachep->memcg_params.memcg->css);
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}
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/*
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|
|
@ -2778,7 +2777,7 @@ struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr)
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if (PageSlab(page)) {
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cachep = page->slab_cache;
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if (!is_root_cache(cachep))
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memcg = cachep->memcg_params->memcg;
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memcg = cachep->memcg_params.memcg;
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} else
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/* page allocated by alloc_kmem_pages */
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memcg = page->mem_cgroup;
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|
|
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48
mm/slab.h
48
mm/slab.h
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@ -86,8 +86,6 @@ extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
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extern void create_boot_cache(struct kmem_cache *, const char *name,
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size_t size, unsigned long flags);
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struct mem_cgroup;
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int slab_unmergeable(struct kmem_cache *s);
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struct kmem_cache *find_mergeable(size_t size, size_t align,
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unsigned long flags, const char *name, void (*ctor)(void *));
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|
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@ -167,14 +165,13 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
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#ifdef CONFIG_MEMCG_KMEM
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static inline bool is_root_cache(struct kmem_cache *s)
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{
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return !s->memcg_params || s->memcg_params->is_root_cache;
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return s->memcg_params.is_root_cache;
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}
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static inline bool slab_equal_or_root(struct kmem_cache *s,
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struct kmem_cache *p)
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struct kmem_cache *p)
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{
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return (p == s) ||
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(s->memcg_params && (p == s->memcg_params->root_cache));
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return p == s || p == s->memcg_params.root_cache;
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}
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/*
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@ -185,37 +182,30 @@ static inline bool slab_equal_or_root(struct kmem_cache *s,
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static inline const char *cache_name(struct kmem_cache *s)
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{
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if (!is_root_cache(s))
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return s->memcg_params->root_cache->name;
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s = s->memcg_params.root_cache;
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return s->name;
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}
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/*
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* Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
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* That said the caller must assure the memcg's cache won't go away. Since once
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* created a memcg's cache is destroyed only along with the root cache, it is
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* true if we are going to allocate from the cache or hold a reference to the
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* root cache by other means. Otherwise, we should hold either the slab_mutex
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* or the memcg's slab_caches_mutex while calling this function and accessing
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* the returned value.
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* That said the caller must assure the memcg's cache won't go away by either
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* taking a css reference to the owner cgroup, or holding the slab_mutex.
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*/
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static inline struct kmem_cache *
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cache_from_memcg_idx(struct kmem_cache *s, int idx)
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{
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struct kmem_cache *cachep;
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struct memcg_cache_params *params;
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if (!s->memcg_params)
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return NULL;
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struct memcg_cache_array *arr;
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rcu_read_lock();
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params = rcu_dereference(s->memcg_params);
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arr = rcu_dereference(s->memcg_params.memcg_caches);
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/*
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* Make sure we will access the up-to-date value. The code updating
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* memcg_caches issues a write barrier to match this (see
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* memcg_register_cache()).
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* memcg_create_kmem_cache()).
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*/
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cachep = lockless_dereference(params->memcg_caches[idx]);
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cachep = lockless_dereference(arr->entries[idx]);
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rcu_read_unlock();
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return cachep;
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@ -225,7 +215,7 @@ static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
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{
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if (is_root_cache(s))
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return s;
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return s->memcg_params->root_cache;
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return s->memcg_params.root_cache;
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}
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static __always_inline int memcg_charge_slab(struct kmem_cache *s,
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@ -235,7 +225,7 @@ static __always_inline int memcg_charge_slab(struct kmem_cache *s,
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return 0;
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if (is_root_cache(s))
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return 0;
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return memcg_charge_kmem(s->memcg_params->memcg, gfp, 1 << order);
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return memcg_charge_kmem(s->memcg_params.memcg, gfp, 1 << order);
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}
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static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
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|
|
@ -244,9 +234,13 @@ static __always_inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
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return;
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if (is_root_cache(s))
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return;
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memcg_uncharge_kmem(s->memcg_params->memcg, 1 << order);
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memcg_uncharge_kmem(s->memcg_params.memcg, 1 << order);
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}
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#else
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extern void slab_init_memcg_params(struct kmem_cache *);
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#else /* !CONFIG_MEMCG_KMEM */
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static inline bool is_root_cache(struct kmem_cache *s)
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{
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return true;
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|
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@ -282,7 +276,11 @@ static inline int memcg_charge_slab(struct kmem_cache *s, gfp_t gfp, int order)
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static inline void memcg_uncharge_slab(struct kmem_cache *s, int order)
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{
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}
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#endif
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static inline void slab_init_memcg_params(struct kmem_cache *s)
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{
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}
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#endif /* CONFIG_MEMCG_KMEM */
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static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
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{
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|
|
|
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131
mm/slab_common.c
131
mm/slab_common.c
|
|
@ -106,62 +106,66 @@ static inline int kmem_cache_sanity_check(const char *name, size_t size)
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#endif
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#ifdef CONFIG_MEMCG_KMEM
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static int memcg_alloc_cache_params(struct mem_cgroup *memcg,
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struct kmem_cache *s, struct kmem_cache *root_cache)
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void slab_init_memcg_params(struct kmem_cache *s)
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{
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size_t size;
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s->memcg_params.is_root_cache = true;
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RCU_INIT_POINTER(s->memcg_params.memcg_caches, NULL);
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}
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|
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if (!memcg_kmem_enabled())
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return 0;
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|
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if (!memcg) {
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size = offsetof(struct memcg_cache_params, memcg_caches);
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size += memcg_nr_cache_ids * sizeof(void *);
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} else
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size = sizeof(struct memcg_cache_params);
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|
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s->memcg_params = kzalloc(size, GFP_KERNEL);
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if (!s->memcg_params)
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return -ENOMEM;
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static int init_memcg_params(struct kmem_cache *s,
|
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struct mem_cgroup *memcg, struct kmem_cache *root_cache)
|
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{
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struct memcg_cache_array *arr;
|
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|
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if (memcg) {
|
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s->memcg_params->memcg = memcg;
|
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s->memcg_params->root_cache = root_cache;
|
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} else
|
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s->memcg_params->is_root_cache = true;
|
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s->memcg_params.is_root_cache = false;
|
||||
s->memcg_params.memcg = memcg;
|
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s->memcg_params.root_cache = root_cache;
|
||||
return 0;
|
||||
}
|
||||
|
||||
slab_init_memcg_params(s);
|
||||
|
||||
if (!memcg_nr_cache_ids)
|
||||
return 0;
|
||||
|
||||
arr = kzalloc(sizeof(struct memcg_cache_array) +
|
||||
memcg_nr_cache_ids * sizeof(void *),
|
||||
GFP_KERNEL);
|
||||
if (!arr)
|
||||
return -ENOMEM;
|
||||
|
||||
RCU_INIT_POINTER(s->memcg_params.memcg_caches, arr);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void memcg_free_cache_params(struct kmem_cache *s)
|
||||
static void destroy_memcg_params(struct kmem_cache *s)
|
||||
{
|
||||
kfree(s->memcg_params);
|
||||
if (is_root_cache(s))
|
||||
kfree(rcu_access_pointer(s->memcg_params.memcg_caches));
|
||||
}
|
||||
|
||||
static int memcg_update_cache_params(struct kmem_cache *s, int num_memcgs)
|
||||
static int update_memcg_params(struct kmem_cache *s, int new_array_size)
|
||||
{
|
||||
int size;
|
||||
struct memcg_cache_params *new_params, *cur_params;
|
||||
struct memcg_cache_array *old, *new;
|
||||
|
||||
BUG_ON(!is_root_cache(s));
|
||||
if (!is_root_cache(s))
|
||||
return 0;
|
||||
|
||||
size = offsetof(struct memcg_cache_params, memcg_caches);
|
||||
size += num_memcgs * sizeof(void *);
|
||||
|
||||
new_params = kzalloc(size, GFP_KERNEL);
|
||||
if (!new_params)
|
||||
new = kzalloc(sizeof(struct memcg_cache_array) +
|
||||
new_array_size * sizeof(void *), GFP_KERNEL);
|
||||
if (!new)
|
||||
return -ENOMEM;
|
||||
|
||||
cur_params = s->memcg_params;
|
||||
memcpy(new_params->memcg_caches, cur_params->memcg_caches,
|
||||
memcg_nr_cache_ids * sizeof(void *));
|
||||
|
||||
new_params->is_root_cache = true;
|
||||
|
||||
rcu_assign_pointer(s->memcg_params, new_params);
|
||||
if (cur_params)
|
||||
kfree_rcu(cur_params, rcu_head);
|
||||
old = rcu_dereference_protected(s->memcg_params.memcg_caches,
|
||||
lockdep_is_held(&slab_mutex));
|
||||
if (old)
|
||||
memcpy(new->entries, old->entries,
|
||||
memcg_nr_cache_ids * sizeof(void *));
|
||||
|
||||
rcu_assign_pointer(s->memcg_params.memcg_caches, new);
|
||||
if (old)
|
||||
kfree_rcu(old, rcu);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -172,10 +176,7 @@ int memcg_update_all_caches(int num_memcgs)
|
|||
|
||||
mutex_lock(&slab_mutex);
|
||||
list_for_each_entry(s, &slab_caches, list) {
|
||||
if (!is_root_cache(s))
|
||||
continue;
|
||||
|
||||
ret = memcg_update_cache_params(s, num_memcgs);
|
||||
ret = update_memcg_params(s, num_memcgs);
|
||||
/*
|
||||
* Instead of freeing the memory, we'll just leave the caches
|
||||
* up to this point in an updated state.
|
||||
|
|
@ -187,13 +188,13 @@ int memcg_update_all_caches(int num_memcgs)
|
|||
return ret;
|
||||
}
|
||||
#else
|
||||
static inline int memcg_alloc_cache_params(struct mem_cgroup *memcg,
|
||||
struct kmem_cache *s, struct kmem_cache *root_cache)
|
||||
static inline int init_memcg_params(struct kmem_cache *s,
|
||||
struct mem_cgroup *memcg, struct kmem_cache *root_cache)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void memcg_free_cache_params(struct kmem_cache *s)
|
||||
static inline void destroy_memcg_params(struct kmem_cache *s)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_MEMCG_KMEM */
|
||||
|
|
@ -311,7 +312,7 @@ do_kmem_cache_create(char *name, size_t object_size, size_t size, size_t align,
|
|||
s->align = align;
|
||||
s->ctor = ctor;
|
||||
|
||||
err = memcg_alloc_cache_params(memcg, s, root_cache);
|
||||
err = init_memcg_params(s, memcg, root_cache);
|
||||
if (err)
|
||||
goto out_free_cache;
|
||||
|
||||
|
|
@ -327,7 +328,7 @@ out:
|
|||
return s;
|
||||
|
||||
out_free_cache:
|
||||
memcg_free_cache_params(s);
|
||||
destroy_memcg_params(s);
|
||||
kmem_cache_free(kmem_cache, s);
|
||||
goto out;
|
||||
}
|
||||
|
|
@ -439,11 +440,15 @@ static int do_kmem_cache_shutdown(struct kmem_cache *s,
|
|||
|
||||
#ifdef CONFIG_MEMCG_KMEM
|
||||
if (!is_root_cache(s)) {
|
||||
struct kmem_cache *root_cache = s->memcg_params->root_cache;
|
||||
int memcg_id = memcg_cache_id(s->memcg_params->memcg);
|
||||
int idx;
|
||||
struct memcg_cache_array *arr;
|
||||
|
||||
BUG_ON(root_cache->memcg_params->memcg_caches[memcg_id] != s);
|
||||
root_cache->memcg_params->memcg_caches[memcg_id] = NULL;
|
||||
idx = memcg_cache_id(s->memcg_params.memcg);
|
||||
arr = rcu_dereference_protected(s->memcg_params.root_cache->
|
||||
memcg_params.memcg_caches,
|
||||
lockdep_is_held(&slab_mutex));
|
||||
BUG_ON(arr->entries[idx] != s);
|
||||
arr->entries[idx] = NULL;
|
||||
}
|
||||
#endif
|
||||
list_move(&s->list, release);
|
||||
|
|
@ -481,27 +486,32 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
|
|||
struct kmem_cache *root_cache)
|
||||
{
|
||||
static char memcg_name_buf[NAME_MAX + 1]; /* protected by slab_mutex */
|
||||
int memcg_id = memcg_cache_id(memcg);
|
||||
struct memcg_cache_array *arr;
|
||||
struct kmem_cache *s = NULL;
|
||||
char *cache_name;
|
||||
int idx;
|
||||
|
||||
get_online_cpus();
|
||||
get_online_mems();
|
||||
|
||||
mutex_lock(&slab_mutex);
|
||||
|
||||
idx = memcg_cache_id(memcg);
|
||||
arr = rcu_dereference_protected(root_cache->memcg_params.memcg_caches,
|
||||
lockdep_is_held(&slab_mutex));
|
||||
|
||||
/*
|
||||
* Since per-memcg caches are created asynchronously on first
|
||||
* allocation (see memcg_kmem_get_cache()), several threads can try to
|
||||
* create the same cache, but only one of them may succeed.
|
||||
*/
|
||||
if (cache_from_memcg_idx(root_cache, memcg_id))
|
||||
if (arr->entries[idx])
|
||||
goto out_unlock;
|
||||
|
||||
cgroup_name(mem_cgroup_css(memcg)->cgroup,
|
||||
memcg_name_buf, sizeof(memcg_name_buf));
|
||||
cache_name = kasprintf(GFP_KERNEL, "%s(%d:%s)", root_cache->name,
|
||||
memcg_cache_id(memcg), memcg_name_buf);
|
||||
idx, memcg_name_buf);
|
||||
if (!cache_name)
|
||||
goto out_unlock;
|
||||
|
||||
|
|
@ -525,7 +535,7 @@ void memcg_create_kmem_cache(struct mem_cgroup *memcg,
|
|||
* initialized.
|
||||
*/
|
||||
smp_wmb();
|
||||
root_cache->memcg_params->memcg_caches[memcg_id] = s;
|
||||
arr->entries[idx] = s;
|
||||
|
||||
out_unlock:
|
||||
mutex_unlock(&slab_mutex);
|
||||
|
|
@ -545,7 +555,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *memcg)
|
|||
|
||||
mutex_lock(&slab_mutex);
|
||||
list_for_each_entry_safe(s, s2, &slab_caches, list) {
|
||||
if (is_root_cache(s) || s->memcg_params->memcg != memcg)
|
||||
if (is_root_cache(s) || s->memcg_params.memcg != memcg)
|
||||
continue;
|
||||
/*
|
||||
* The cgroup is about to be freed and therefore has no charges
|
||||
|
|
@ -564,7 +574,7 @@ void memcg_destroy_kmem_caches(struct mem_cgroup *memcg)
|
|||
|
||||
void slab_kmem_cache_release(struct kmem_cache *s)
|
||||
{
|
||||
memcg_free_cache_params(s);
|
||||
destroy_memcg_params(s);
|
||||
kfree(s->name);
|
||||
kmem_cache_free(kmem_cache, s);
|
||||
}
|
||||
|
|
@ -640,6 +650,9 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t siz
|
|||
s->name = name;
|
||||
s->size = s->object_size = size;
|
||||
s->align = calculate_alignment(flags, ARCH_KMALLOC_MINALIGN, size);
|
||||
|
||||
slab_init_memcg_params(s);
|
||||
|
||||
err = __kmem_cache_create(s, flags);
|
||||
|
||||
if (err)
|
||||
|
|
@ -980,7 +993,7 @@ int memcg_slab_show(struct seq_file *m, void *p)
|
|||
|
||||
if (p == slab_caches.next)
|
||||
print_slabinfo_header(m);
|
||||
if (!is_root_cache(s) && s->memcg_params->memcg == memcg)
|
||||
if (!is_root_cache(s) && s->memcg_params.memcg == memcg)
|
||||
cache_show(s, m);
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3577,6 +3577,7 @@ static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache)
|
|||
p->slab_cache = s;
|
||||
#endif
|
||||
}
|
||||
slab_init_memcg_params(s);
|
||||
list_add(&s->list, &slab_caches);
|
||||
return s;
|
||||
}
|
||||
|
|
@ -4964,7 +4965,7 @@ static void memcg_propagate_slab_attrs(struct kmem_cache *s)
|
|||
if (is_root_cache(s))
|
||||
return;
|
||||
|
||||
root_cache = s->memcg_params->root_cache;
|
||||
root_cache = s->memcg_params.root_cache;
|
||||
|
||||
/*
|
||||
* This mean this cache had no attribute written. Therefore, no point
|
||||
|
|
@ -5044,7 +5045,7 @@ static inline struct kset *cache_kset(struct kmem_cache *s)
|
|||
{
|
||||
#ifdef CONFIG_MEMCG_KMEM
|
||||
if (!is_root_cache(s))
|
||||
return s->memcg_params->root_cache->memcg_kset;
|
||||
return s->memcg_params.root_cache->memcg_kset;
|
||||
#endif
|
||||
return slab_kset;
|
||||
}
|
||||
|
|
|
|||
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