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![Roman Gushchin](/assets/img/avatar_default.png)
In general it's unknown in advance if a slab page will contain accounted objects or not. In order to avoid memory waste, an obj_cgroup vector is allocated dynamically when a need to account of a new object arises. Such approach is memory efficient, but requires an expensive cmpxchg() to set up the memcg/objcgs pointer, because an allocation can race with a different allocation on another cpu. But in some common cases it's known for sure that a slab page will contain accounted objects: if the page belongs to a slab cache with a SLAB_ACCOUNT flag set. It includes such popular objects like vm_area_struct, anon_vma, task_struct, etc. In such cases we can pre-allocate the objcgs vector and simple assign it to the page without any atomic operations, because at this early stage the page is not visible to anyone else. A very simplistic benchmark (allocating 10000000 64-bytes objects in a row) shows ~15% win. In the real life it seems that most workloads are not very sensitive to the speed of (accounted) slab allocations. [guro@fb.com: open-code set_page_objcgs() and add some comments, by Johannes] Link: https://lkml.kernel.org/r/20201113001926.GA2934489@carbon.dhcp.thefacebook.com [akpm@linux-foundation.org: fix it for mm-slub-call-account_slab_page-after-slab-page-initialization-fix.patch] Link: https://lkml.kernel.org/r/20201110195753.530157-2-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Shakeel Butt <shakeelb@google.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
634 lines
17 KiB
C
634 lines
17 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MM_SLAB_H
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#define MM_SLAB_H
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/*
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* Internal slab definitions
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*/
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#ifdef CONFIG_SLOB
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/*
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* Common fields provided in kmem_cache by all slab allocators
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* This struct is either used directly by the allocator (SLOB)
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* or the allocator must include definitions for all fields
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* provided in kmem_cache_common in their definition of kmem_cache.
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*
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* Once we can do anonymous structs (C11 standard) we could put a
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* anonymous struct definition in these allocators so that the
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* separate allocations in the kmem_cache structure of SLAB and
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* SLUB is no longer needed.
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*/
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struct kmem_cache {
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unsigned int object_size;/* The original size of the object */
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unsigned int size; /* The aligned/padded/added on size */
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unsigned int align; /* Alignment as calculated */
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slab_flags_t flags; /* Active flags on the slab */
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unsigned int useroffset;/* Usercopy region offset */
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unsigned int usersize; /* Usercopy region size */
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const char *name; /* Slab name for sysfs */
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int refcount; /* Use counter */
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void (*ctor)(void *); /* Called on object slot creation */
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struct list_head list; /* List of all slab caches on the system */
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};
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#endif /* CONFIG_SLOB */
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#ifdef CONFIG_SLAB
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#include <linux/slab_def.h>
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#endif
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#ifdef CONFIG_SLUB
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#include <linux/slub_def.h>
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#endif
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#include <linux/memcontrol.h>
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#include <linux/fault-inject.h>
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#include <linux/kasan.h>
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#include <linux/kmemleak.h>
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#include <linux/random.h>
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#include <linux/sched/mm.h>
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/*
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* State of the slab allocator.
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*
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* This is used to describe the states of the allocator during bootup.
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* Allocators use this to gradually bootstrap themselves. Most allocators
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* have the problem that the structures used for managing slab caches are
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* allocated from slab caches themselves.
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*/
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enum slab_state {
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DOWN, /* No slab functionality yet */
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PARTIAL, /* SLUB: kmem_cache_node available */
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PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
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UP, /* Slab caches usable but not all extras yet */
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FULL /* Everything is working */
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};
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extern enum slab_state slab_state;
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/* The slab cache mutex protects the management structures during changes */
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extern struct mutex slab_mutex;
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/* The list of all slab caches on the system */
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extern struct list_head slab_caches;
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/* The slab cache that manages slab cache information */
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extern struct kmem_cache *kmem_cache;
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/* A table of kmalloc cache names and sizes */
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extern const struct kmalloc_info_struct {
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const char *name[NR_KMALLOC_TYPES];
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unsigned int size;
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} kmalloc_info[];
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#ifndef CONFIG_SLOB
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/* Kmalloc array related functions */
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void setup_kmalloc_cache_index_table(void);
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void create_kmalloc_caches(slab_flags_t);
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/* Find the kmalloc slab corresponding for a certain size */
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struct kmem_cache *kmalloc_slab(size_t, gfp_t);
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#endif
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gfp_t kmalloc_fix_flags(gfp_t flags);
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/* Functions provided by the slab allocators */
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int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
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struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size,
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slab_flags_t flags, unsigned int useroffset,
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unsigned int usersize);
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extern void create_boot_cache(struct kmem_cache *, const char *name,
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unsigned int size, slab_flags_t flags,
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unsigned int useroffset, unsigned int usersize);
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int slab_unmergeable(struct kmem_cache *s);
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struct kmem_cache *find_mergeable(unsigned size, unsigned align,
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slab_flags_t flags, const char *name, void (*ctor)(void *));
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#ifndef CONFIG_SLOB
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struct kmem_cache *
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__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
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slab_flags_t flags, void (*ctor)(void *));
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slab_flags_t kmem_cache_flags(unsigned int object_size,
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slab_flags_t flags, const char *name);
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#else
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static inline struct kmem_cache *
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__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
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slab_flags_t flags, void (*ctor)(void *))
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{ return NULL; }
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static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
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slab_flags_t flags, const char *name)
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{
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return flags;
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}
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#endif
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/* Legal flag mask for kmem_cache_create(), for various configurations */
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#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
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SLAB_CACHE_DMA32 | SLAB_PANIC | \
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SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
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#if defined(CONFIG_DEBUG_SLAB)
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
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#elif defined(CONFIG_SLUB_DEBUG)
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
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SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
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#else
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#define SLAB_DEBUG_FLAGS (0)
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#endif
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#if defined(CONFIG_SLAB)
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#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
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SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
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SLAB_ACCOUNT)
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#elif defined(CONFIG_SLUB)
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#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | SLAB_ACCOUNT)
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#else
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#define SLAB_CACHE_FLAGS (0)
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#endif
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/* Common flags available with current configuration */
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#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
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/* Common flags permitted for kmem_cache_create */
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#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
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SLAB_RED_ZONE | \
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SLAB_POISON | \
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SLAB_STORE_USER | \
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SLAB_TRACE | \
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SLAB_CONSISTENCY_CHECKS | \
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SLAB_MEM_SPREAD | \
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SLAB_NOLEAKTRACE | \
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SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | \
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SLAB_ACCOUNT)
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bool __kmem_cache_empty(struct kmem_cache *);
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int __kmem_cache_shutdown(struct kmem_cache *);
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void __kmem_cache_release(struct kmem_cache *);
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int __kmem_cache_shrink(struct kmem_cache *);
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void slab_kmem_cache_release(struct kmem_cache *);
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struct seq_file;
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struct file;
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struct slabinfo {
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unsigned long active_objs;
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unsigned long num_objs;
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unsigned long active_slabs;
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unsigned long num_slabs;
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unsigned long shared_avail;
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unsigned int limit;
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unsigned int batchcount;
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unsigned int shared;
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unsigned int objects_per_slab;
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unsigned int cache_order;
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};
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void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
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void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
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ssize_t slabinfo_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos);
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/*
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* Generic implementation of bulk operations
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* These are useful for situations in which the allocator cannot
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* perform optimizations. In that case segments of the object listed
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* may be allocated or freed using these operations.
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*/
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void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
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int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
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static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s)
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{
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return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
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NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B;
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}
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#ifdef CONFIG_SLUB_DEBUG
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#ifdef CONFIG_SLUB_DEBUG_ON
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DECLARE_STATIC_KEY_TRUE(slub_debug_enabled);
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#else
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DECLARE_STATIC_KEY_FALSE(slub_debug_enabled);
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#endif
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extern void print_tracking(struct kmem_cache *s, void *object);
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#else
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static inline void print_tracking(struct kmem_cache *s, void *object)
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{
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}
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#endif
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/*
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* Returns true if any of the specified slub_debug flags is enabled for the
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* cache. Use only for flags parsed by setup_slub_debug() as it also enables
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* the static key.
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*/
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static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags)
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{
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#ifdef CONFIG_SLUB_DEBUG
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VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS));
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if (static_branch_unlikely(&slub_debug_enabled))
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return s->flags & flags;
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#endif
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return false;
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}
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#ifdef CONFIG_MEMCG_KMEM
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int memcg_alloc_page_obj_cgroups(struct page *page, struct kmem_cache *s,
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gfp_t gfp, bool new_page);
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static inline void memcg_free_page_obj_cgroups(struct page *page)
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{
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kfree(page_objcgs(page));
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page->memcg_data = 0;
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}
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static inline size_t obj_full_size(struct kmem_cache *s)
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{
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/*
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* For each accounted object there is an extra space which is used
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* to store obj_cgroup membership. Charge it too.
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*/
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return s->size + sizeof(struct obj_cgroup *);
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}
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/*
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* Returns false if the allocation should fail.
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*/
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static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s,
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struct obj_cgroup **objcgp,
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size_t objects, gfp_t flags)
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{
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struct obj_cgroup *objcg;
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if (!memcg_kmem_enabled())
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return true;
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if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT))
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return true;
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objcg = get_obj_cgroup_from_current();
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if (!objcg)
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return true;
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if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) {
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obj_cgroup_put(objcg);
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return false;
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}
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*objcgp = objcg;
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return true;
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}
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static inline void mod_objcg_state(struct obj_cgroup *objcg,
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struct pglist_data *pgdat,
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enum node_stat_item idx, int nr)
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{
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struct mem_cgroup *memcg;
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struct lruvec *lruvec;
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rcu_read_lock();
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memcg = obj_cgroup_memcg(objcg);
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lruvec = mem_cgroup_lruvec(memcg, pgdat);
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mod_memcg_lruvec_state(lruvec, idx, nr);
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rcu_read_unlock();
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}
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static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
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struct obj_cgroup *objcg,
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gfp_t flags, size_t size,
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void **p)
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{
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struct page *page;
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unsigned long off;
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size_t i;
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if (!memcg_kmem_enabled() || !objcg)
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return;
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flags &= ~__GFP_ACCOUNT;
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for (i = 0; i < size; i++) {
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if (likely(p[i])) {
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page = virt_to_head_page(p[i]);
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if (!page_objcgs(page) &&
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memcg_alloc_page_obj_cgroups(page, s, flags,
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false)) {
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obj_cgroup_uncharge(objcg, obj_full_size(s));
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continue;
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}
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off = obj_to_index(s, page, p[i]);
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obj_cgroup_get(objcg);
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page_objcgs(page)[off] = objcg;
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mod_objcg_state(objcg, page_pgdat(page),
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cache_vmstat_idx(s), obj_full_size(s));
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} else {
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obj_cgroup_uncharge(objcg, obj_full_size(s));
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}
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}
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obj_cgroup_put(objcg);
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}
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static inline void memcg_slab_free_hook(struct kmem_cache *s_orig,
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void **p, int objects)
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{
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struct kmem_cache *s;
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struct obj_cgroup **objcgs;
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struct obj_cgroup *objcg;
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struct page *page;
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unsigned int off;
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int i;
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if (!memcg_kmem_enabled())
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return;
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for (i = 0; i < objects; i++) {
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if (unlikely(!p[i]))
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continue;
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page = virt_to_head_page(p[i]);
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objcgs = page_objcgs(page);
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if (!objcgs)
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continue;
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if (!s_orig)
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s = page->slab_cache;
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else
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s = s_orig;
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off = obj_to_index(s, page, p[i]);
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objcg = objcgs[off];
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if (!objcg)
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continue;
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objcgs[off] = NULL;
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obj_cgroup_uncharge(objcg, obj_full_size(s));
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mod_objcg_state(objcg, page_pgdat(page), cache_vmstat_idx(s),
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-obj_full_size(s));
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obj_cgroup_put(objcg);
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}
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}
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#else /* CONFIG_MEMCG_KMEM */
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static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr)
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{
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return NULL;
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}
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static inline int memcg_alloc_page_obj_cgroups(struct page *page,
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struct kmem_cache *s, gfp_t gfp,
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bool new_page)
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{
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return 0;
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}
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static inline void memcg_free_page_obj_cgroups(struct page *page)
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{
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}
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static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s,
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struct obj_cgroup **objcgp,
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size_t objects, gfp_t flags)
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{
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return true;
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}
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static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s,
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struct obj_cgroup *objcg,
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gfp_t flags, size_t size,
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void **p)
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{
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}
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static inline void memcg_slab_free_hook(struct kmem_cache *s,
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void **p, int objects)
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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 *virt_to_cache(const void *obj)
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{
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struct page *page;
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page = virt_to_head_page(obj);
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if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n",
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__func__))
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return NULL;
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return page->slab_cache;
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}
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static __always_inline void account_slab_page(struct page *page, int order,
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struct kmem_cache *s,
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gfp_t gfp)
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{
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if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT))
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memcg_alloc_page_obj_cgroups(page, s, gfp, true);
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mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
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PAGE_SIZE << order);
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}
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static __always_inline void unaccount_slab_page(struct page *page, int order,
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struct kmem_cache *s)
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{
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if (memcg_kmem_enabled())
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memcg_free_page_obj_cgroups(page);
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mod_node_page_state(page_pgdat(page), cache_vmstat_idx(s),
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-(PAGE_SIZE << order));
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}
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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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struct kmem_cache *cachep;
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if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
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!kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS))
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return s;
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cachep = virt_to_cache(x);
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if (WARN(cachep && cachep != s,
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"%s: Wrong slab cache. %s but object is from %s\n",
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__func__, s->name, cachep->name))
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print_tracking(cachep, x);
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return cachep;
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}
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static inline size_t slab_ksize(const struct kmem_cache *s)
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{
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#ifndef CONFIG_SLUB
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return s->object_size;
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#else /* CONFIG_SLUB */
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# ifdef CONFIG_SLUB_DEBUG
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/*
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* Debugging requires use of the padding between object
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* and whatever may come after it.
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*/
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if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
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return s->object_size;
|
|
# endif
|
|
if (s->flags & SLAB_KASAN)
|
|
return s->object_size;
|
|
/*
|
|
* If we have the need to store the freelist pointer
|
|
* back there or track user information then we can
|
|
* only use the space before that information.
|
|
*/
|
|
if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
|
|
return s->inuse;
|
|
/*
|
|
* Else we can use all the padding etc for the allocation
|
|
*/
|
|
return s->size;
|
|
#endif
|
|
}
|
|
|
|
static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
|
|
struct obj_cgroup **objcgp,
|
|
size_t size, gfp_t flags)
|
|
{
|
|
flags &= gfp_allowed_mask;
|
|
|
|
might_alloc(flags);
|
|
|
|
if (should_failslab(s, flags))
|
|
return NULL;
|
|
|
|
if (!memcg_slab_pre_alloc_hook(s, objcgp, size, flags))
|
|
return NULL;
|
|
|
|
return s;
|
|
}
|
|
|
|
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;
|
|
|
|
flags &= gfp_allowed_mask;
|
|
for (i = 0; i < size; i++) {
|
|
p[i] = kasan_slab_alloc(s, p[i], flags);
|
|
/* As p[i] might get tagged, call kmemleak hook after KASAN. */
|
|
kmemleak_alloc_recursive(p[i], s->object_size, 1,
|
|
s->flags, flags);
|
|
}
|
|
|
|
memcg_slab_post_alloc_hook(s, objcg, flags, size, p);
|
|
}
|
|
|
|
#ifndef CONFIG_SLOB
|
|
/*
|
|
* The slab lists for all objects.
|
|
*/
|
|
struct kmem_cache_node {
|
|
spinlock_t list_lock;
|
|
|
|
#ifdef CONFIG_SLAB
|
|
struct list_head slabs_partial; /* partial list first, better asm code */
|
|
struct list_head slabs_full;
|
|
struct list_head slabs_free;
|
|
unsigned long total_slabs; /* length of all slab lists */
|
|
unsigned long free_slabs; /* length of free slab list only */
|
|
unsigned long free_objects;
|
|
unsigned int free_limit;
|
|
unsigned int colour_next; /* Per-node cache coloring */
|
|
struct array_cache *shared; /* shared per node */
|
|
struct alien_cache **alien; /* on other nodes */
|
|
unsigned long next_reap; /* updated without locking */
|
|
int free_touched; /* updated without locking */
|
|
#endif
|
|
|
|
#ifdef CONFIG_SLUB
|
|
unsigned long nr_partial;
|
|
struct list_head partial;
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
atomic_long_t nr_slabs;
|
|
atomic_long_t total_objects;
|
|
struct list_head full;
|
|
#endif
|
|
#endif
|
|
|
|
};
|
|
|
|
static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
|
|
{
|
|
return s->node[node];
|
|
}
|
|
|
|
/*
|
|
* Iterator over all nodes. The body will be executed for each node that has
|
|
* a kmem_cache_node structure allocated (which is true for all online nodes)
|
|
*/
|
|
#define for_each_kmem_cache_node(__s, __node, __n) \
|
|
for (__node = 0; __node < nr_node_ids; __node++) \
|
|
if ((__n = get_node(__s, __node)))
|
|
|
|
#endif
|
|
|
|
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);
|
|
int memcg_slab_show(struct seq_file *m, void *p);
|
|
|
|
#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
|
|
void dump_unreclaimable_slab(void);
|
|
#else
|
|
static inline void dump_unreclaimable_slab(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
|
|
|
|
#ifdef CONFIG_SLAB_FREELIST_RANDOM
|
|
int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
|
|
gfp_t gfp);
|
|
void cache_random_seq_destroy(struct kmem_cache *cachep);
|
|
#else
|
|
static inline int cache_random_seq_create(struct kmem_cache *cachep,
|
|
unsigned int count, gfp_t gfp)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
|
|
#endif /* CONFIG_SLAB_FREELIST_RANDOM */
|
|
|
|
static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c)
|
|
{
|
|
if (static_branch_unlikely(&init_on_alloc)) {
|
|
if (c->ctor)
|
|
return false;
|
|
if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))
|
|
return flags & __GFP_ZERO;
|
|
return true;
|
|
}
|
|
return flags & __GFP_ZERO;
|
|
}
|
|
|
|
static inline bool slab_want_init_on_free(struct kmem_cache *c)
|
|
{
|
|
if (static_branch_unlikely(&init_on_free))
|
|
return !(c->ctor ||
|
|
(c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)));
|
|
return false;
|
|
}
|
|
|
|
#define KS_ADDRS_COUNT 16
|
|
struct kmem_obj_info {
|
|
void *kp_ptr;
|
|
struct page *kp_page;
|
|
void *kp_objp;
|
|
unsigned long kp_data_offset;
|
|
struct kmem_cache *kp_slab_cache;
|
|
void *kp_ret;
|
|
void *kp_stack[KS_ADDRS_COUNT];
|
|
};
|
|
void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct page *page);
|
|
|
|
#endif /* MM_SLAB_H */
|