[PATCH] slub: provide /proc/slabinfo
From: Pekka J Enberg
Date: Mon Jan 07 2008 - 07:28:22 EST
From: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
[ Upstream commits: 57ed3eda977a215f054102b460ab0eb5d8d112e6,
6b6adc22a01941165d5af9a3e69e28e948b28f47, and
158a962422e4a54dc256b6a9b9562f3d30d34d9c ]
This adds a read-only /proc/slabinfo file on SLUB, that makes slabtop work.
[ mingo@xxxxxxx: build fix. ]
[ torvalds@xxxxxxxxxxxxxxxxxxxx: config unification. ]
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
---
fs/proc/proc_misc.c | 4 -
include/linux/slab.h | 5 ++
include/linux/slab_def.h | 3 -
init/Kconfig | 6 ++
mm/slab.c | 2
mm/slub.c | 112 +++++++++++++++++++++++++++++++++++++++++------
6 files changed, 113 insertions(+), 19 deletions(-)
Index: linux-2.6.23.y/fs/proc/proc_misc.c
===================================================================
--- linux-2.6.23.y.orig/fs/proc/proc_misc.c 2008-01-07 14:07:50.000000000 +0200
+++ linux-2.6.23.y/fs/proc/proc_misc.c 2008-01-07 14:14:17.000000000 +0200
@@ -397,7 +397,7 @@
};
#endif
-#ifdef CONFIG_SLAB
+#ifdef CONFIG_SLABINFO
static int slabinfo_open(struct inode *inode, struct file *file)
{
return seq_open(file, &slabinfo_op);
@@ -709,7 +709,7 @@
#endif
create_seq_entry("stat", 0, &proc_stat_operations);
create_seq_entry("interrupts", 0, &proc_interrupts_operations);
-#ifdef CONFIG_SLAB
+#ifdef CONFIG_SLABINFO
create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
#ifdef CONFIG_DEBUG_SLAB_LEAK
create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
Index: linux-2.6.23.y/include/linux/slab.h
===================================================================
--- linux-2.6.23.y.orig/include/linux/slab.h 2008-01-07 14:07:55.000000000 +0200
+++ linux-2.6.23.y/include/linux/slab.h 2008-01-07 14:14:17.000000000 +0200
@@ -269,5 +269,10 @@
return kmalloc(size, flags | __GFP_ZERO);
}
+#ifdef CONFIG_SLABINFO
+extern const struct seq_operations slabinfo_op;
+ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
+#endif
+
#endif /* __KERNEL__ */
#endif /* _LINUX_SLAB_H */
Index: linux-2.6.23.y/include/linux/slab_def.h
===================================================================
--- linux-2.6.23.y.orig/include/linux/slab_def.h 2008-01-07 14:07:55.000000000 +0200
+++ linux-2.6.23.y/include/linux/slab_def.h 2008-01-07 14:14:17.000000000 +0200
@@ -95,7 +95,4 @@
#endif /* CONFIG_NUMA */
-extern const struct seq_operations slabinfo_op;
-ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
-
#endif /* _LINUX_SLAB_DEF_H */
Index: linux-2.6.23.y/init/Kconfig
===================================================================
--- linux-2.6.23.y.orig/init/Kconfig 2008-01-07 14:07:55.000000000 +0200
+++ linux-2.6.23.y/init/Kconfig 2008-01-07 14:14:17.000000000 +0200
@@ -573,6 +573,12 @@
endmenu # General setup
+config SLABINFO
+ bool
+ depends on PROC_FS
+ depends on SLAB || SLUB
+ default y
+
config RT_MUTEXES
boolean
select PLIST
Index: linux-2.6.23.y/mm/slab.c
===================================================================
--- linux-2.6.23.y.orig/mm/slab.c 2008-01-07 14:07:55.000000000 +0200
+++ linux-2.6.23.y/mm/slab.c 2008-01-07 14:14:17.000000000 +0200
@@ -4082,7 +4082,7 @@
schedule_delayed_work(work, round_jiffies_relative(REAPTIMEOUT_CPUC));
}
-#ifdef CONFIG_PROC_FS
+#ifdef CONFIG_SLABINFO
static void print_slabinfo_header(struct seq_file *m)
{
Index: linux-2.6.23.y/mm/slub.c
===================================================================
--- linux-2.6.23.y.orig/mm/slub.c 2008-01-07 14:07:55.000000000 +0200
+++ linux-2.6.23.y/mm/slub.c 2008-01-07 14:14:17.000000000 +0200
@@ -2789,6 +2789,19 @@
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)
@@ -3171,19 +3184,6 @@
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,
@@ -3823,3 +3823,89 @@
__initcall(slab_sysfs_init);
#endif
+
+/*
+ * The /proc/slabinfo ABI
+ */
+#ifdef CONFIG_SLABINFO
+
+ssize_t slabinfo_write(struct file *file, const char __user * buffer,
+ size_t count, loff_t *ppos)
+{
+ return -EINVAL;
+}
+
+
+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_SLABINFO */
--
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