diff options
author | Pekka J Enberg <penberg@cs.helsinki.fi> | 2008-01-01 17:23:28 +0100 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-01 11:32:02 -0800 |
commit | 57ed3eda977a215f054102b460ab0eb5d8d112e6 (patch) | |
tree | aff1529df49c14df1f84d78fbae66a4a0bcfcdb8 | |
parent | 476c6c11a9ee4610ff0e4941e3851729f7caf062 (diff) | |
download | op-kernel-dev-57ed3eda977a215f054102b460ab0eb5d8d112e6.zip op-kernel-dev-57ed3eda977a215f054102b460ab0eb5d8d112e6.tar.gz |
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>
-rw-r--r-- | include/linux/slub_def.h | 2 | ||||
-rw-r--r-- | mm/slub.c | 105 |
2 files changed, 94 insertions, 13 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 40801e7..b7d9408a0 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -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 */ @@ -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 */ |