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-rw-r--r--Documentation/vm/slabinfo.c27
-rw-r--r--include/linux/slub_def.h2
-rw-r--r--mm/slub.c150
3 files changed, 110 insertions, 69 deletions
diff --git a/Documentation/vm/slabinfo.c b/Documentation/vm/slabinfo.c
index 22d7e3e..d3ce295 100644
--- a/Documentation/vm/slabinfo.c
+++ b/Documentation/vm/slabinfo.c
@@ -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");
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 4131e5f..4236b5d 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -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 *);
diff --git a/mm/slub.c b/mm/slub.c
index 0a220df..c8514e9 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -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_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);
- if (flags & SO_PARTIAL) {
- if (flags & SO_OBJECTS)
- x = count_partial(n);
else
- x = n->nr_partial;
+ x = atomic_long_read(&n->nr_slabs);
total += x;
nodes[node] += x;
}
- if (flags & SO_FULL) {
- int full_slabs = atomic_long_read(&n->nr_slabs)
- - per_cpu[node]
- - n->nr_partial;
+ } 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_OBJECTS)
- x = full_slabs * oo_objects(s->oo);
+ if (flags & SO_TOTAL)
+ x = count_partial(n, count_total);
+ else if (flags & SO_OBJECTS)
+ x = count_partial(n, count_inuse);
else
- x = full_slabs;
+ x = n->nr_partial;
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),
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