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slub: provide /proc/slabinfo

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This adds a read-only /proc/slabinfo file on SLUB, that makes slabtop work.

[ mingo@elte.hu: build fix. ]

Cc: Andi Kleen <andi@firstfloor.org>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pekka J Enberg 2008-01-01 17:23:28 +01:00 committed by Linus Torvalds
parent 476c6c11a9
commit 57ed3eda97
2 changed files with 94 additions and 13 deletions
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2
include/linux/slub_def.h
View File

@ -200,4 +200,6 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
}
#endif
extern const struct seq_operations slabinfo_op;
#endif /* _LINUX_SLUB_DEF_H */

105
mm/slub.c
View File

@ -3076,6 +3076,19 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
return slab_alloc(s, gfpflags, node, caller);
}
static unsigned long count_partial(struct kmem_cache_node *n)
{
unsigned long flags;
unsigned long x = 0;
struct page *page;
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
x += page->inuse;
spin_unlock_irqrestore(&n->list_lock, flags);
return x;
}
#if defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)
static int validate_slab(struct kmem_cache *s, struct page *page,
unsigned long *map)
@ -3458,19 +3471,6 @@ static int list_locations(struct kmem_cache *s, char *buf,
return n;
}
static unsigned long count_partial(struct kmem_cache_node *n)
{
unsigned long flags;
unsigned long x = 0;
struct page *page;
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
x += page->inuse;
spin_unlock_irqrestore(&n->list_lock, flags);
return x;
}
enum slab_stat_type {
SL_FULL,
SL_PARTIAL,
@ -4123,3 +4123,82 @@ static int __init slab_sysfs_init(void)
__initcall(slab_sysfs_init);
#endif
/*
* The /proc/slabinfo ABI
*/
#ifdef CONFIG_PROC_FS
static void print_slabinfo_header(struct seq_file *m)
{
seq_puts(m, "slabinfo - version: 2.1\n");
seq_puts(m, "# name <active_objs> <num_objs> <objsize> "
"<objperslab> <pagesperslab>");
seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
seq_putc(m, '\n');
}
static void *s_start(struct seq_file *m, loff_t *pos)
{
loff_t n = *pos;
down_read(&slub_lock);
if (!n)
print_slabinfo_header(m);
return seq_list_start(&slab_caches, *pos);
}
static void *s_next(struct seq_file *m, void *p, loff_t *pos)
{
return seq_list_next(p, &slab_caches, pos);
}
static void s_stop(struct seq_file *m, void *p)
{
up_read(&slub_lock);
}
static int s_show(struct seq_file *m, void *p)
{
unsigned long nr_partials = 0;
unsigned long nr_slabs = 0;
unsigned long nr_inuse = 0;
unsigned long nr_objs;
struct kmem_cache *s;
int node;
s = list_entry(p, struct kmem_cache, list);
for_each_online_node(node) {
struct kmem_cache_node *n = get_node(s, node);
if (!n)
continue;
nr_partials += n->nr_partial;
nr_slabs += atomic_long_read(&n->nr_slabs);
nr_inuse += count_partial(n);
}
nr_objs = nr_slabs * s->objects;
nr_inuse += (nr_slabs - nr_partials) * s->objects;
seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse,
nr_objs, s->size, s->objects, (1 << s->order));
seq_printf(m, " : tunables %4u %4u %4u", 0, 0, 0);
seq_printf(m, " : slabdata %6lu %6lu %6lu", nr_slabs, nr_slabs,
0UL);
seq_putc(m, '\n');
return 0;
}
const struct seq_operations slabinfo_op = {
.start = s_start,
.next = s_next,
.stop = s_stop,
.show = s_show,
};
#endif /* CONFIG_PROC_FS */