slub: provide /proc/slabinfo
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>
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@ -200,4 +200,6 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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}
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#endif
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extern const struct seq_operations slabinfo_op;
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#endif /* _LINUX_SLUB_DEF_H */
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105
mm/slub.c
105
mm/slub.c
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@ -3076,6 +3076,19 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
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return slab_alloc(s, gfpflags, node, caller);
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}
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static unsigned long count_partial(struct kmem_cache_node *n)
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{
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unsigned long flags;
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unsigned long x = 0;
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struct page *page;
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spin_lock_irqsave(&n->list_lock, flags);
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list_for_each_entry(page, &n->partial, lru)
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x += page->inuse;
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spin_unlock_irqrestore(&n->list_lock, flags);
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return x;
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}
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#if defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)
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static int validate_slab(struct kmem_cache *s, struct page *page,
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unsigned long *map)
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@ -3458,19 +3471,6 @@ static int list_locations(struct kmem_cache *s, char *buf,
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return n;
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}
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static unsigned long count_partial(struct kmem_cache_node *n)
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{
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unsigned long flags;
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unsigned long x = 0;
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struct page *page;
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spin_lock_irqsave(&n->list_lock, flags);
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list_for_each_entry(page, &n->partial, lru)
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x += page->inuse;
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spin_unlock_irqrestore(&n->list_lock, flags);
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return x;
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}
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enum slab_stat_type {
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SL_FULL,
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SL_PARTIAL,
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@ -4123,3 +4123,82 @@ static int __init slab_sysfs_init(void)
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__initcall(slab_sysfs_init);
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#endif
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/*
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* The /proc/slabinfo ABI
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*/
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#ifdef CONFIG_PROC_FS
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static void print_slabinfo_header(struct seq_file *m)
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{
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seq_puts(m, "slabinfo - version: 2.1\n");
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seq_puts(m, "# name <active_objs> <num_objs> <objsize> "
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"<objperslab> <pagesperslab>");
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seq_puts(m, " : tunables <limit> <batchcount> <sharedfactor>");
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seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
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seq_putc(m, '\n');
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}
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static void *s_start(struct seq_file *m, loff_t *pos)
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{
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loff_t n = *pos;
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down_read(&slub_lock);
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if (!n)
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print_slabinfo_header(m);
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return seq_list_start(&slab_caches, *pos);
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}
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static void *s_next(struct seq_file *m, void *p, loff_t *pos)
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{
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return seq_list_next(p, &slab_caches, pos);
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}
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static void s_stop(struct seq_file *m, void *p)
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{
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up_read(&slub_lock);
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}
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static int s_show(struct seq_file *m, void *p)
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{
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unsigned long nr_partials = 0;
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unsigned long nr_slabs = 0;
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unsigned long nr_inuse = 0;
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unsigned long nr_objs;
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struct kmem_cache *s;
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int node;
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s = list_entry(p, struct kmem_cache, list);
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for_each_online_node(node) {
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struct kmem_cache_node *n = get_node(s, node);
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if (!n)
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continue;
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nr_partials += n->nr_partial;
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nr_slabs += atomic_long_read(&n->nr_slabs);
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nr_inuse += count_partial(n);
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}
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nr_objs = nr_slabs * s->objects;
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nr_inuse += (nr_slabs - nr_partials) * s->objects;
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seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse,
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nr_objs, s->size, s->objects, (1 << s->order));
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seq_printf(m, " : tunables %4u %4u %4u", 0, 0, 0);
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seq_printf(m, " : slabdata %6lu %6lu %6lu", nr_slabs, nr_slabs,
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0UL);
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seq_putc(m, '\n');
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return 0;
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}
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const struct seq_operations slabinfo_op = {
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.start = s_start,
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.next = s_next,
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.stop = s_stop,
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.show = s_show,
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};
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#endif /* CONFIG_PROC_FS */
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