mm/slub.c

Source file repositories/reference/linux-study-clean/mm/slub.c

File Facts

System
Linux kernel
Corpus path
mm/slub.c
Extension
.c
Size
255004 bytes
Lines
10032
Domain
Core OS
Bucket
Memory Management
Inferred role
Core OS: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

static const struct file_operations slab_debugfs_fops = {
	.open    = slab_debug_trace_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = slab_debug_trace_release,
};

static void debugfs_slab_add(struct kmem_cache *s)
{
	struct dentry *slab_cache_dir;

	if (unlikely(!slab_debugfs_root))
		return;

	slab_cache_dir = debugfs_create_dir(s->name, slab_debugfs_root);

	debugfs_create_file_aux_num("alloc_traces", 0400, slab_cache_dir, s,
					TRACK_ALLOC, &slab_debugfs_fops);

	debugfs_create_file_aux_num("free_traces", 0400, slab_cache_dir, s,
					TRACK_FREE, &slab_debugfs_fops);
}

void debugfs_slab_release(struct kmem_cache *s)
{
	debugfs_lookup_and_remove(s->name, slab_debugfs_root);
}

static int __init slab_debugfs_init(void)
{
	struct kmem_cache *s;

	slab_debugfs_root = debugfs_create_dir("slab", NULL);

	list_for_each_entry(s, &slab_caches, list)
		if (s->flags & SLAB_STORE_USER)
			debugfs_slab_add(s);

	return 0;

}
__initcall(slab_debugfs_init);
#endif
/*
 * The /proc/slabinfo ABI
 */
#ifdef CONFIG_SLUB_DEBUG
void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo)
{
	unsigned long nr_slabs = 0;
	unsigned long nr_objs = 0;
	unsigned long nr_free = 0;
	int node;
	struct kmem_cache_node *n;

	for_each_kmem_cache_node(s, node, n) {
		nr_slabs += node_nr_slabs(n);
		nr_objs += node_nr_objs(n);
		nr_free += count_partial_free_approx(n);
	}

	sinfo->active_objs = nr_objs - nr_free;
	sinfo->num_objs = nr_objs;
	sinfo->active_slabs = nr_slabs;
	sinfo->num_slabs = nr_slabs;
	sinfo->objects_per_slab = oo_objects(s->oo);
	sinfo->cache_order = oo_order(s->oo);
}
#endif /* CONFIG_SLUB_DEBUG */

Annotation

Implementation Notes