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mm, slab: maintain total slab count instead of active count

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Rather than tracking the number of active slabs for each node, track the
total number of slabs.  This is a minor improvement that avoids active
slab tracking when a slab goes from free to partial or partial to free.

For slab debugging, this also removes an explicit free count since it
can easily be inferred by the difference in number of total objects and
number of active objects.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Rientjes <[email protected]>
Suggested-by: Joonsoo Kim <[email protected]>
Cc: Greg Thelen <[email protected]>
Cc: Aruna Ramakrishna <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2016-12-12 16:41:44 -08:00 • committed by Linus Torvalds
commit bf00bd3458
2 changed files with 31 additions and 43 deletions
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70
mm/slab.c
View file

@ -227,7 +227,7 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent)
INIT_LIST_HEAD(&parent->slabs_full);
INIT_LIST_HEAD(&parent->slabs_partial);
INIT_LIST_HEAD(&parent->slabs_free);
parent->active_slabs = 0;
parent->total_slabs = 0;
parent->free_slabs = 0;
parent->shared = NULL;
parent->alien = NULL;
@ -1381,20 +1381,18 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
cachep->name, cachep->size, cachep->gfporder);
for_each_kmem_cache_node(cachep, node, n) {
unsigned long active_objs = 0, free_objs = 0;
unsigned long active_slabs, num_slabs;
unsigned long total_slabs, free_slabs, free_objs;
spin_lock_irqsave(&n->list_lock, flags);
active_slabs = n->active_slabs;
num_slabs = active_slabs + n->free_slabs;
active_objs += (num_slabs * cachep->num) - n->free_objects;
free_objs += n->free_objects;
total_slabs = n->total_slabs;
free_slabs = n->free_slabs;
free_objs = n->free_objects;
spin_unlock_irqrestore(&n->list_lock, flags);
pr_warn(" node %d: slabs: %ld/%ld, objs: %ld/%ld, free: %ld\n",
node, active_slabs, num_slabs, active_objs,
num_slabs * cachep->num, free_objs);
pr_warn(" node %d: slabs: %ld/%ld, objs: %ld/%ld\n",
node, total_slabs - free_slabs, total_slabs,
(total_slabs * cachep->num) - free_objs,
total_slabs * cachep->num);
}
#endif
}
@ -2307,6 +2305,7 @@ static int drain_freelist(struct kmem_cache *cache,
page = list_entry(p, struct page, lru);
list_del(&page->lru);
n->free_slabs--;
n->total_slabs--;
/*
* Safe to drop the lock. The slab is no longer linked
* to the cache.
@ -2741,13 +2740,12 @@ static void cache_grow_end(struct kmem_cache *cachep, struct page *page)
n = get_node(cachep, page_to_nid(page));
spin_lock(&n->list_lock);
n->total_slabs++;
if (!page->active) {
list_add_tail(&page->lru, &(n->slabs_free));
n->free_slabs++;
} else {
} else
fixup_slab_list(cachep, n, page, &list);
n->active_slabs++;
}
STATS_INC_GROWN(cachep);
n->free_objects += cachep->num - page->active;
@ -2874,7 +2872,7 @@ static inline void fixup_slab_list(struct kmem_cache *cachep,
/* Try to find non-pfmemalloc slab if needed */
static noinline struct page *get_valid_first_slab(struct kmem_cache_node *n,
struct page *page, bool *page_is_free, bool pfmemalloc)
struct page *page, bool pfmemalloc)
{
if (!page)
return NULL;
@ -2893,10 +2891,9 @@ static noinline struct page *get_valid_first_slab(struct kmem_cache_node *n,
/* Move pfmemalloc slab to the end of list to speed up next search */
list_del(&page->lru);
if (*page_is_free) {
WARN_ON(page->active);
if (!page->active) {
list_add_tail(&page->lru, &n->slabs_free);
*page_is_free = false;
n->free_slabs++;
} else
list_add_tail(&page->lru, &n->slabs_partial);
@ -2908,7 +2905,7 @@ static noinline struct page *get_valid_first_slab(struct kmem_cache_node *n,
n->free_touched = 1;
list_for_each_entry(page, &n->slabs_free, lru) {
if (!PageSlabPfmemalloc(page)) {
*page_is_free = true;
n->free_slabs--;
return page;
}
}
@ -2919,26 +2916,19 @@ static noinline struct page *get_valid_first_slab(struct kmem_cache_node *n,
static struct page *get_first_slab(struct kmem_cache_node *n, bool pfmemalloc)
{
struct page *page;
bool page_is_free = false;
assert_spin_locked(&n->list_lock);
page = list_first_entry_or_null(&n->slabs_partial,
struct page, lru);
page = list_first_entry_or_null(&n->slabs_partial, struct page, lru);
if (!page) {
n->free_touched = 1;
page = list_first_entry_or_null(&n->slabs_free,
struct page, lru);
page = list_first_entry_or_null(&n->slabs_free, struct page,
lru);
if (page)
page_is_free = true;
n->free_slabs--;
}
if (sk_memalloc_socks())
page = get_valid_first_slab(n, page, &page_is_free, pfmemalloc);
if (page && page_is_free) {
n->active_slabs++;
n->free_slabs--;
}
page = get_valid_first_slab(n, page, pfmemalloc);
return page;
}
@ -3441,7 +3431,6 @@ static void free_block(struct kmem_cache *cachep, void **objpp,
if (page->active == 0) {
list_add(&page->lru, &n->slabs_free);
n->free_slabs++;
n->active_slabs--;
} else {
/* Unconditionally move a slab to the end of the
* partial list on free - maximum time for the
@ -3457,6 +3446,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp,
page = list_last_entry(&n->slabs_free, struct page, lru);
list_move(&page->lru, list);
n->free_slabs--;
n->total_slabs--;
}
}
@ -4109,8 +4099,8 @@ out:
void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
{
unsigned long active_objs, num_objs, active_slabs;
unsigned long num_slabs = 0, free_objs = 0, shared_avail = 0;
unsigned long num_slabs_free = 0;
unsigned long total_slabs = 0, free_objs = 0, shared_avail = 0;
unsigned long free_slabs = 0;
int node;
struct kmem_cache_node *n;
@ -4118,9 +4108,8 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
check_irq_on();
spin_lock_irq(&n->list_lock);
num_slabs += n->active_slabs + n->free_slabs;
num_slabs_free += n->free_slabs;
total_slabs += n->total_slabs;
free_slabs += n->free_slabs;
free_objs += n->free_objects;
if (n->shared)
@ -4128,15 +4117,14 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
spin_unlock_irq(&n->list_lock);
}
num_objs = num_slabs * cachep->num;
active_slabs = num_slabs - num_slabs_free;
num_objs = total_slabs * cachep->num;
active_slabs = total_slabs - free_slabs;
active_objs = num_objs - free_objs;
sinfo->active_objs = active_objs;
sinfo->num_objs = num_objs;
sinfo->active_slabs = active_slabs;
sinfo->num_slabs = num_slabs;
sinfo->num_slabs = total_slabs;
sinfo->shared_avail = shared_avail;
sinfo->limit = cachep->limit;
sinfo->batchcount = cachep->batchcount;