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slub: Update statistics handling for variable order slabs

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Change the statistics to consider that slabs of the same slabcache
can have different number of objects in them since they may be of
different order.

Provide a new sysfs field

	total_objects

which shows the total objects that the allocated slabs of a slabcache
could hold.

Add a max field that holds the largest slab order that was ever used
for a slab cache.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Christoph Lameter 2008-04-14 19:11:40 +03:00 committed by Pekka Enberg
parent 834f3d1192
commit 205ab99dd1
3 changed files with 115 additions and 74 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

27
Documentation/vm/slabinfo.c
View file

@ -31,7 +31,7 @@ struct slabinfo {
int hwcache_align, object_size, objs_per_slab;
int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
unsigned long partial, objects, slabs;
unsigned long partial, objects, slabs, objects_partial, objects_total;
unsigned long alloc_fastpath, alloc_slowpath;
unsigned long free_fastpath, free_slowpath;
unsigned long free_frozen, free_add_partial, free_remove_partial;
@ -540,7 +540,8 @@ void slabcache(struct slabinfo *s)
return;
store_size(size_str, slab_size(s));
snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs, s->partial, s->cpu_slabs);
snprintf(dist_str, 40, "%lu/%lu/%d", s->slabs - s->cpu_slabs,
s->partial, s->cpu_slabs);
if (!line++)
first_line();
@ -776,7 +777,6 @@ void totals(void)
unsigned long used;
unsigned long long wasted;
unsigned long long objwaste;
long long objects_in_partial_slabs;
unsigned long percentage_partial_slabs;
unsigned long percentage_partial_objs;
@ -790,18 +790,11 @@ void totals(void)
wasted = size - used;
objwaste = s->slab_size - s->object_size;
objects_in_partial_slabs = s->objects -
(s->slabs - s->partial - s ->cpu_slabs) *
s->objs_per_slab;
if (objects_in_partial_slabs < 0)
objects_in_partial_slabs = 0;
percentage_partial_slabs = s->partial * 100 / s->slabs;
if (percentage_partial_slabs > 100)
percentage_partial_slabs = 100;
percentage_partial_objs = objects_in_partial_slabs * 100
percentage_partial_objs = s->objects_partial * 100
/ s->objects;
if (percentage_partial_objs > 100)
@ -823,8 +816,8 @@ void totals(void)
min_objects = s->objects;
if (used < min_used)
min_used = used;
if (objects_in_partial_slabs < min_partobj)
min_partobj = objects_in_partial_slabs;
if (s->objects_partial < min_partobj)
min_partobj = s->objects_partial;
if (percentage_partial_slabs < min_ppart)
min_ppart = percentage_partial_slabs;
if (percentage_partial_objs < min_ppartobj)
@ -848,8 +841,8 @@ void totals(void)
max_objects = s->objects;
if (used > max_used)
max_used = used;
if (objects_in_partial_slabs > max_partobj)
max_partobj = objects_in_partial_slabs;
if (s->objects_partial > max_partobj)
max_partobj = s->objects_partial;
if (percentage_partial_slabs > max_ppart)
max_ppart = percentage_partial_slabs;
if (percentage_partial_objs > max_ppartobj)
@ -864,7 +857,7 @@ void totals(void)
total_objects += s->objects;
total_used += used;
total_partobj += objects_in_partial_slabs;
total_partobj += s->objects_partial;
total_ppart += percentage_partial_slabs;
total_ppartobj += percentage_partial_objs;
@ -1160,6 +1153,8 @@ void read_slab_dir(void)
slab->hwcache_align = get_obj("hwcache_align");
slab->object_size = get_obj("object_size");
slab->objects = get_obj("objects");
slab->objects_partial = get_obj("objects_partial");
slab->objects_total = get_obj("objects_total");
slab->objs_per_slab = get_obj("objs_per_slab");
slab->order = get_obj("order");
slab->partial = get_obj("partial");

2
include/linux/slub_def.h
View file

@ -48,6 +48,7 @@ struct kmem_cache_node {
struct list_head partial;
#ifdef CONFIG_SLUB_DEBUG
atomic_long_t nr_slabs;
atomic_long_t total_objects;
struct list_head full;
#endif
};
@ -79,6 +80,7 @@ struct kmem_cache {
struct kmem_cache_node local_node;
/* Allocation and freeing of slabs */
struct kmem_cache_order_objects max;
gfp_t allocflags; /* gfp flags to use on each alloc */
int refcount; /* Refcount for slab cache destroy */
void (*ctor)(struct kmem_cache *, void *);

160
mm/slub.c
View file

@ -886,7 +886,7 @@ static inline unsigned long slabs_node(struct kmem_cache *s, int node)
return atomic_long_read(&n->nr_slabs);
}
static inline void inc_slabs_node(struct kmem_cache *s, int node)
static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
{
struct kmem_cache_node *n = get_node(s, node);
@ -896,14 +896,17 @@ static inline void inc_slabs_node(struct kmem_cache *s, int node)
* dilemma by deferring the increment of the count during
* bootstrap (see early_kmem_cache_node_alloc).
*/
if (!NUMA_BUILD || n)
if (!NUMA_BUILD || n) {
atomic_long_inc(&n->nr_slabs);
atomic_long_add(objects, &n->total_objects);
}
}
static inline void dec_slabs_node(struct kmem_cache *s, int node)
static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects)
{
struct kmem_cache_node *n = get_node(s, node);
atomic_long_dec(&n->nr_slabs);
atomic_long_sub(objects, &n->total_objects);
}
/* Object debug checks for alloc/free paths */
@ -1101,9 +1104,12 @@ static inline unsigned long kmem_cache_flags(unsigned long objsize,
static inline unsigned long slabs_node(struct kmem_cache *s, int node)
{ return 0; }
static inline void inc_slabs_node(struct kmem_cache *s, int node) {}
static inline void dec_slabs_node(struct kmem_cache *s, int node) {}
static inline void inc_slabs_node(struct kmem_cache *s, int node,
int objects) {}
static inline void dec_slabs_node(struct kmem_cache *s, int node,
int objects) {}
#endif
/*
* Slab allocation and freeing
*/
@ -1155,7 +1161,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
if (!page)
goto out;
inc_slabs_node(s, page_to_nid(page));
inc_slabs_node(s, page_to_nid(page), page->objects);
page->slab = s;
page->flags |= 1 << PG_slab;
if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON |
@ -1230,7 +1236,7 @@ static void free_slab(struct kmem_cache *s, struct page *page)
static void discard_slab(struct kmem_cache *s, struct page *page)
{
dec_slabs_node(s, page_to_nid(page));
dec_slabs_node(s, page_to_nid(page), page->objects);
free_slab(s, page);
}
@ -2144,7 +2150,7 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags,
init_tracking(kmalloc_caches, n);
#endif
init_kmem_cache_node(n);
inc_slabs_node(kmalloc_caches, node);
inc_slabs_node(kmalloc_caches, node, page->objects);
/*
* lockdep requires consistent irq usage for each lock
@ -2341,6 +2347,8 @@ static int calculate_sizes(struct kmem_cache *s)
* Determine the number of objects per slab
*/
s->oo = oo_make(order, size);
if (oo_objects(s->oo) > oo_objects(s->max))
s->max = s->oo;
return !!oo_objects(s->oo);
@ -2813,7 +2821,7 @@ int kmem_cache_shrink(struct kmem_cache *s)
struct kmem_cache_node *n;
struct page *page;
struct page *t;
int objects = oo_objects(s->oo);
int objects = oo_objects(s->max);
struct list_head *slabs_by_inuse =
kmalloc(sizeof(struct list_head) * objects, GFP_KERNEL);
unsigned long flags;
@ -3276,7 +3284,8 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
}
#if (defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)) || defined(CONFIG_SLABINFO)
static unsigned long count_partial(struct kmem_cache_node *n)
static unsigned long count_partial(struct kmem_cache_node *n,
int (*get_count)(struct page *))
{
unsigned long flags;
unsigned long x = 0;
@ -3284,10 +3293,25 @@ static unsigned long count_partial(struct kmem_cache_node *n)
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
x += page->inuse;
x += get_count(page);
spin_unlock_irqrestore(&n->list_lock, flags);
return x;
}
static int count_inuse(struct page *page)
{
return page->inuse;
}
static int count_total(struct page *page)
{
return page->objects;
}
static int count_free(struct page *page)
{
return page->objects - page->inuse;
}
#endif
#if defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)
@ -3376,7 +3400,7 @@ static long validate_slab_cache(struct kmem_cache *s)
{
int node;
unsigned long count = 0;
unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->oo)) *
unsigned long *map = kmalloc(BITS_TO_LONGS(oo_objects(s->max)) *
sizeof(unsigned long), GFP_KERNEL);
if (!map)
@ -3676,22 +3700,23 @@ static int list_locations(struct kmem_cache *s, char *buf,
}
enum slab_stat_type {
SL_FULL,
SL_PARTIAL,
SL_CPU,
SL_OBJECTS
SL_ALL, /* All slabs */
SL_PARTIAL, /* Only partially allocated slabs */
SL_CPU, /* Only slabs used for cpu caches */
SL_OBJECTS, /* Determine allocated objects not slabs */
SL_TOTAL /* Determine object capacity not slabs */
};
#define SO_FULL (1 << SL_FULL)
#define SO_ALL (1 << SL_ALL)
#define SO_PARTIAL (1 << SL_PARTIAL)
#define SO_CPU (1 << SL_CPU)
#define SO_OBJECTS (1 << SL_OBJECTS)
#define SO_TOTAL (1 << SL_TOTAL)
static ssize_t show_slab_objects(struct kmem_cache *s,
char *buf, unsigned long flags)
{
unsigned long total = 0;
int cpu;
int node;
int x;
unsigned long *nodes;
@ -3702,56 +3727,60 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
return -ENOMEM;
per_cpu = nodes + nr_node_ids;
for_each_possible_cpu(cpu) {
struct page *page;
struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);
if (flags & SO_CPU) {
int cpu;
if (!c)
continue;
for_each_possible_cpu(cpu) {
struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);
page = c->page;
node = c->node;
if (node < 0)
continue;
if (page) {
if (flags & SO_CPU) {
if (flags & SO_OBJECTS)
x = page->inuse;
if (!c || c->node < 0)
continue;
if (c->page) {
if (flags & SO_TOTAL)
x = c->page->objects;
else if (flags & SO_OBJECTS)
x = c->page->inuse;
else
x = 1;
total += x;
nodes[node] += x;
nodes[c->node] += x;
}
per_cpu[node]++;
per_cpu[c->node]++;
}
}
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n = get_node(s, node);
if (flags & SO_ALL) {
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n = get_node(s, node);
if (flags & SO_PARTIAL) {
if (flags & SO_OBJECTS)
x = count_partial(n);
if (flags & SO_TOTAL)
x = atomic_long_read(&n->total_objects);
else if (flags & SO_OBJECTS)
x = atomic_long_read(&n->total_objects) -
count_partial(n, count_free);
else
x = atomic_long_read(&n->nr_slabs);
total += x;
nodes[node] += x;
}
} else if (flags & SO_PARTIAL) {
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n = get_node(s, node);
if (flags & SO_TOTAL)
x = count_partial(n, count_total);
else if (flags & SO_OBJECTS)
x = count_partial(n, count_inuse);
else
x = n->nr_partial;
total += x;
nodes[node] += x;
}
if (flags & SO_FULL) {
int full_slabs = atomic_long_read(&n->nr_slabs)
- per_cpu[node]
- n->nr_partial;
if (flags & SO_OBJECTS)
x = full_slabs * oo_objects(s->oo);
else
x = full_slabs;
total += x;
nodes[node] += x;
}
}
x = sprintf(buf, "%lu", total);
#ifdef CONFIG_NUMA
for_each_node_state(node, N_NORMAL_MEMORY)
@ -3852,7 +3881,7 @@ SLAB_ATTR_RO(aliases);
static ssize_t slabs_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_FULL|SO_PARTIAL|SO_CPU);
return show_slab_objects(s, buf, SO_ALL);
}
SLAB_ATTR_RO(slabs);
@ -3870,10 +3899,22 @@ SLAB_ATTR_RO(cpu_slabs);
static ssize_t objects_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_FULL|SO_PARTIAL|SO_CPU|SO_OBJECTS);
return show_slab_objects(s, buf, SO_ALL|SO_OBJECTS);
}
SLAB_ATTR_RO(objects);
static ssize_t objects_partial_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_PARTIAL|SO_OBJECTS);
}
SLAB_ATTR_RO(objects_partial);
static ssize_t total_objects_show(struct kmem_cache *s, char *buf)
{
return show_slab_objects(s, buf, SO_ALL|SO_TOTAL);
}
SLAB_ATTR_RO(total_objects);
static ssize_t sanity_checks_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%d\n", !!(s->flags & SLAB_DEBUG_FREE));
@ -4131,6 +4172,8 @@ static struct attribute *slab_attrs[] = {
&objs_per_slab_attr.attr,
&order_attr.attr,
&objects_attr.attr,
&objects_partial_attr.attr,
&total_objects_attr.attr,
&slabs_attr.attr,
&partial_attr.attr,
&cpu_slabs_attr.attr,
@ -4459,7 +4502,8 @@ 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;
unsigned long nr_objs = 0;
unsigned long nr_free = 0;
struct kmem_cache *s;
int node;
@ -4473,11 +4517,11 @@ static int s_show(struct seq_file *m, void *p)
nr_partials += n->nr_partial;
nr_slabs += atomic_long_read(&n->nr_slabs);
nr_inuse += count_partial(n);
nr_objs += atomic_long_read(&n->total_objects);
nr_free += count_partial(n, count_free);
}
nr_objs = nr_slabs * oo_objects(s->oo);
nr_inuse += (nr_slabs - nr_partials) * oo_objects(s->oo);
nr_inuse = nr_objs - nr_free;
seq_printf(m, "%-17s %6lu %6lu %6u %4u %4d", s->name, nr_inuse,
nr_objs, s->size, oo_objects(s->oo),