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 */
#ifdef CONFIG_SLAB
#include <linux/kmemleak.h>
#include <linux/random.h>
#include <linux/sched/mm.h>
+#include <linux/kmemleak.h>
/*
* State of the slab allocator.
struct kmem_cache *kmalloc_slab(size_t, gfp_t);
#endif
+gfp_t kmalloc_fix_flags(gfp_t flags);
/* Functions provided by the slab allocators */
int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
int __kmem_cache_shutdown(struct kmem_cache *);
void __kmem_cache_release(struct kmem_cache *);
int __kmem_cache_shrink(struct kmem_cache *);
-void __kmemcg_cache_deactivate(struct kmem_cache *s);
-void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s);
void slab_kmem_cache_release(struct kmem_cache *);
-void kmem_cache_shrink_all(struct kmem_cache *s);
struct seq_file;
struct file;
static inline int cache_vmstat_idx(struct kmem_cache *s)
{
return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
+ NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B;
}
-#ifdef CONFIG_MEMCG_KMEM
-
-/* List of all root caches. */
-extern struct list_head slab_root_caches;
-#define root_caches_node memcg_params.__root_caches_node
+#ifdef CONFIG_SLUB_DEBUG
+#ifdef CONFIG_SLUB_DEBUG_ON
+DECLARE_STATIC_KEY_TRUE(slub_debug_enabled);
+#else
+DECLARE_STATIC_KEY_FALSE(slub_debug_enabled);
+#endif
+extern void print_tracking(struct kmem_cache *s, void *object);
+#else
+static inline void print_tracking(struct kmem_cache *s, void *object)
+{
+}
+#endif
/*
- * Iterate over all memcg caches of the given root cache. The caller must hold
- * slab_mutex.
+ * Returns true if any of the specified slub_debug flags is enabled for the
+ * cache. Use only for flags parsed by setup_slub_debug() as it also enables
+ * the static key.
*/
-#define for_each_memcg_cache(iter, root) \
- list_for_each_entry(iter, &(root)->memcg_params.children, \
- memcg_params.children_node)
-
-static inline bool is_root_cache(struct kmem_cache *s)
+static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags)
{
- return !s->memcg_params.root_cache;
+#ifdef CONFIG_SLUB_DEBUG
+ VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS));
+ if (static_branch_unlikely(&slub_debug_enabled))
+ return s->flags & flags;
+#endif
+ return false;
}
-static inline bool slab_equal_or_root(struct kmem_cache *s,
- struct kmem_cache *p)
+#ifdef CONFIG_MEMCG_KMEM
+static inline struct obj_cgroup **page_obj_cgroups(struct page *page)
{
- return p == s || p == s->memcg_params.root_cache;
+ /*
+ * page->mem_cgroup and page->obj_cgroups are sharing the same
+ * space. To distinguish between them in case we don't know for sure
+ * that the page is a slab page (e.g. page_cgroup_ino()), let's
+ * always set the lowest bit of obj_cgroups.
+ */
+ return (struct obj_cgroup **)
+ ((unsigned long)page->obj_cgroups & ~0x1UL);
}
-/*
- * We use suffixes to the name in memcg because we can't have caches
- * created in the system with the same name. But when we print them
- * locally, better refer to them with the base name
- */
-static inline const char *cache_name(struct kmem_cache *s)
+static inline bool page_has_obj_cgroups(struct page *page)
{
- if (!is_root_cache(s))
- s = s->memcg_params.root_cache;
- return s->name;
+ return ((unsigned long)page->obj_cgroups & 0x1UL);
}
-static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
+int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s,
+ gfp_t gfp);
+
+static inline void memcg_free_page_obj_cgroups(struct page *page)
{
- if (is_root_cache(s))
- return s;
- return s->memcg_params.root_cache;
+ kfree(page_obj_cgroups(page));
+ page->obj_cgroups = NULL;
}
-/*
- * Expects a pointer to a slab page. Please note, that PageSlab() check
- * isn't sufficient, as it returns true also for tail compound slab pages,
- * which do not have slab_cache pointer set.
- * So this function assumes that the page can pass PageSlab() && !PageTail()
- * check.
- *
- * The kmem_cache can be reparented asynchronously. The caller must ensure
- * the memcg lifetime, e.g. by taking rcu_read_lock() or cgroup_mutex.
- */
-static inline struct mem_cgroup *memcg_from_slab_page(struct page *page)
+static inline size_t obj_full_size(struct kmem_cache *s)
{
- struct kmem_cache *s;
-
- s = READ_ONCE(page->slab_cache);
- if (s && !is_root_cache(s))
- return READ_ONCE(s->memcg_params.memcg);
-
- return NULL;
+ /*
+ * For each accounted object there is an extra space which is used
+ * to store obj_cgroup membership. Charge it too.
+ */
+ return s->size + sizeof(struct obj_cgroup *);
}
-/*
- * Charge the slab page belonging to the non-root kmem_cache.
- * Can be called for non-root kmem_caches only.
- */
-static __always_inline int memcg_charge_slab(struct page *page,
- gfp_t gfp, int order,
- struct kmem_cache *s)
+static inline struct obj_cgroup *memcg_slab_pre_alloc_hook(struct kmem_cache *s,
+ size_t objects,
+ gfp_t flags)
{
- int nr_pages = 1 << order;
- struct mem_cgroup *memcg;
- struct lruvec *lruvec;
- int ret;
-
- rcu_read_lock();
- memcg = READ_ONCE(s->memcg_params.memcg);
- while (memcg && !css_tryget_online(&memcg->css))
- memcg = parent_mem_cgroup(memcg);
- rcu_read_unlock();
+ struct obj_cgroup *objcg;
- if (unlikely(!memcg || mem_cgroup_is_root(memcg))) {
- mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- nr_pages);
- percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages);
- return 0;
- }
+ if (memcg_kmem_bypass())
+ return NULL;
- ret = memcg_kmem_charge(memcg, gfp, nr_pages);
- if (ret)
- goto out;
+ objcg = get_obj_cgroup_from_current();
+ if (!objcg)
+ return NULL;
- lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
- mod_lruvec_state(lruvec, cache_vmstat_idx(s), nr_pages);
+ if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) {
+ obj_cgroup_put(objcg);
+ return NULL;
+ }
- /* transer try_charge() page references to kmem_cache */
- percpu_ref_get_many(&s->memcg_params.refcnt, nr_pages);
- css_put_many(&memcg->css, nr_pages);
-out:
- css_put(&memcg->css);
- return ret;
+ return objcg;
}
-/*
- * Uncharge a slab page belonging to a non-root kmem_cache.
- * Can be called for non-root kmem_caches only.
- */
-static __always_inline void memcg_uncharge_slab(struct page *page, int order,
- struct kmem_cache *s)
+static inline void mod_objcg_state(struct obj_cgroup *objcg,
+ struct pglist_data *pgdat,
+ int idx, int nr)
{
- int nr_pages = 1 << order;
struct mem_cgroup *memcg;
struct lruvec *lruvec;
rcu_read_lock();
- memcg = READ_ONCE(s->memcg_params.memcg);
- if (likely(!mem_cgroup_is_root(memcg))) {
- lruvec = mem_cgroup_lruvec(memcg, page_pgdat(page));
- mod_lruvec_state(lruvec, cache_vmstat_idx(s), -nr_pages);
- memcg_kmem_uncharge(memcg, nr_pages);
- } else {
- mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- -nr_pages);
- }
+ memcg = obj_cgroup_memcg(objcg);
+ lruvec = mem_cgroup_lruvec(memcg, pgdat);
+ mod_memcg_lruvec_state(lruvec, idx, nr);
rcu_read_unlock();
+}
+
+static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
+ struct obj_cgroup *objcg,
+ gfp_t flags, size_t size,
+ void **p)
+{
+ struct page *page;
+ unsigned long off;
+ size_t i;
+
+ if (!objcg)
+ return;
- percpu_ref_put_many(&s->memcg_params.refcnt, nr_pages);
+ flags &= ~__GFP_ACCOUNT;
+ for (i = 0; i < size; i++) {
+ if (likely(p[i])) {
+ page = virt_to_head_page(p[i]);
+
+ if (!page_has_obj_cgroups(page) &&
+ memcg_alloc_page_obj_cgroups(page, s, flags)) {
+ obj_cgroup_uncharge(objcg, obj_full_size(s));
+ continue;
+ }
+
+ off = obj_to_index(s, page, p[i]);
+ obj_cgroup_get(objcg);
+ page_obj_cgroups(page)[off] = objcg;
+ mod_objcg_state(objcg, page_pgdat(page),
+ cache_vmstat_idx(s), obj_full_size(s));
+ } else {
+ obj_cgroup_uncharge(objcg, obj_full_size(s));
+ }
+ }
+ obj_cgroup_put(objcg);
}
-extern void slab_init_memcg_params(struct kmem_cache *);
-extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg);
+static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page,
+ void *p)
+{
+ struct obj_cgroup *objcg;
+ unsigned int off;
-#else /* CONFIG_MEMCG_KMEM */
+ if (!memcg_kmem_enabled())
+ return;
-/* If !memcg, all caches are root. */
-#define slab_root_caches slab_caches
-#define root_caches_node list
+ if (!page_has_obj_cgroups(page))
+ return;
-#define for_each_memcg_cache(iter, root) \
- for ((void)(iter), (void)(root); 0; )
+ off = obj_to_index(s, page, p);
+ objcg = page_obj_cgroups(page)[off];
+ page_obj_cgroups(page)[off] = NULL;
-static inline bool is_root_cache(struct kmem_cache *s)
-{
- return true;
-}
+ if (!objcg)
+ return;
-static inline bool slab_equal_or_root(struct kmem_cache *s,
- struct kmem_cache *p)
-{
- return s == p;
-}
+ obj_cgroup_uncharge(objcg, obj_full_size(s));
+ mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s),
+ -obj_full_size(s));
-static inline const char *cache_name(struct kmem_cache *s)
-{
- return s->name;
+ obj_cgroup_put(objcg);
}
-static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
+#else /* CONFIG_MEMCG_KMEM */
+static inline bool page_has_obj_cgroups(struct page *page)
{
- return s;
+ return false;
}
-static inline struct mem_cgroup *memcg_from_slab_page(struct page *page)
+static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr)
{
return NULL;
}
-static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
- struct kmem_cache *s)
+static inline int memcg_alloc_page_obj_cgroups(struct page *page,
+ struct kmem_cache *s, gfp_t gfp)
{
return 0;
}
-static inline void memcg_uncharge_slab(struct page *page, int order,
- struct kmem_cache *s)
+static inline void memcg_free_page_obj_cgroups(struct page *page)
{
}
-static inline void slab_init_memcg_params(struct kmem_cache *s)
+static inline struct obj_cgroup *memcg_slab_pre_alloc_hook(struct kmem_cache *s,
+ size_t objects,
+ gfp_t flags)
{
+ return NULL;
}
-static inline void memcg_link_cache(struct kmem_cache *s,
- struct mem_cgroup *memcg)
+static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
+ struct obj_cgroup *objcg,
+ gfp_t flags, size_t size,
+ void **p)
{
}
+static inline void memcg_slab_free_hook(struct kmem_cache *s, struct page *page,
+ void *p)
+{
+}
#endif /* CONFIG_MEMCG_KMEM */
static inline struct kmem_cache *virt_to_cache(const void *obj)
return page->slab_cache;
}
-static __always_inline int charge_slab_page(struct page *page,
- gfp_t gfp, int order,
- struct kmem_cache *s)
+static __always_inline void account_slab_page(struct page *page, int order,
+ struct kmem_cache *s)
{
- if (is_root_cache(s)) {
- mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- 1 << order);
- return 0;
- }
-
- return memcg_charge_slab(page, gfp, order, s);
+ mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
+ PAGE_SIZE << order);
}
-static __always_inline void uncharge_slab_page(struct page *page, int order,
- struct kmem_cache *s)
+static __always_inline void unaccount_slab_page(struct page *page, int order,
+ struct kmem_cache *s)
{
- if (is_root_cache(s)) {
- mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
- -(1 << order));
- return;
- }
+ if (memcg_kmem_enabled())
+ memcg_free_page_obj_cgroups(page);
- memcg_uncharge_slab(page, order, s);
+ mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
+ -(PAGE_SIZE << order));
}
static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
{
struct kmem_cache *cachep;
- /*
- * When kmemcg is not being used, both assignments should return the
- * same value. but we don't want to pay the assignment price in that
- * case. If it is not compiled in, the compiler should be smart enough
- * to not do even the assignment. In that case, slab_equal_or_root
- * will also be a constant.
- */
- if (!memcg_kmem_enabled() &&
- !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
- !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
+ if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
+ !kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS))
return s;
cachep = virt_to_cache(x);
- WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
+ if (WARN(cachep && cachep != s,
"%s: Wrong slab cache. %s but object is from %s\n",
- __func__, s->name, cachep->name);
+ __func__, s->name, cachep->name))
+ print_tracking(cachep, x);
return cachep;
}
}
static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
- gfp_t flags)
+ struct obj_cgroup **objcgp,
+ size_t size, gfp_t flags)
{
flags &= gfp_allowed_mask;
if (memcg_kmem_enabled() &&
((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT)))
- return memcg_kmem_get_cache(s);
+ *objcgp = memcg_slab_pre_alloc_hook(s, size, flags);
return s;
}
-static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
- size_t size, void **p)
+static inline void slab_post_alloc_hook(struct kmem_cache *s,
+ struct obj_cgroup *objcg,
+ gfp_t flags, size_t size, void **p)
{
size_t i;
}
if (memcg_kmem_enabled())
- memcg_kmem_put_cache(s);
+ memcg_slab_post_alloc_hook(s, objcg, flags, size, p);
}
#ifndef CONFIG_SLOB
void *slab_start(struct seq_file *m, loff_t *pos);
void *slab_next(struct seq_file *m, void *p, loff_t *pos);
void slab_stop(struct seq_file *m, void *p);
-void *memcg_slab_start(struct seq_file *m, loff_t *pos);
-void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos);
-void memcg_slab_stop(struct seq_file *m, void *p);
int memcg_slab_show(struct seq_file *m, void *p);
#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
projects / linux-2.6-microblaze.git / blobdiff