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Date: Wed, 16 Oct 2013 17:44:09 +0900
From: Joonsoo Kim <iamjoonsoo.kim@....com>
To: Pekka Enberg <penberg@...nel.org>
Cc: Christoph Lameter <cl@...ux.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Joonsoo Kim <js1304@...il.com>,
David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v2 12/15] slab: replace free and inuse in struct slab with newly introduced active
Now, free in struct slab is same meaning as inuse.
So, remove both and replace them with active.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
diff --git a/mm/slab.c b/mm/slab.c
index c271d5b..2ec2336 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -174,8 +174,7 @@ struct slab {
struct {
struct list_head list;
void *s_mem; /* including colour offset */
- unsigned int inuse; /* num of objs active in slab */
- unsigned int free;
+ unsigned int active; /* num of objs active in slab */
};
};
@@ -1658,7 +1657,7 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
active_slabs++;
}
list_for_each_entry(slabp, &n->slabs_partial, list) {
- active_objs += slabp->inuse;
+ active_objs += slabp->active;
active_slabs++;
}
list_for_each_entry(slabp, &n->slabs_free, list)
@@ -2451,7 +2450,7 @@ static int drain_freelist(struct kmem_cache *cache,
slabp = list_entry(p, struct slab, list);
#if DEBUG
- BUG_ON(slabp->inuse);
+ BUG_ON(slabp->active);
#endif
list_del(&slabp->list);
/*
@@ -2570,9 +2569,8 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep,
slabp = addr + colour_off;
colour_off += cachep->slab_size;
}
- slabp->inuse = 0;
+ slabp->active = 0;
slabp->s_mem = addr + colour_off;
- slabp->free = 0;
return slabp;
}
@@ -2642,12 +2640,11 @@ static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp,
{
void *objp;
- slabp->inuse++;
- objp = index_to_obj(cachep, slabp, slab_bufctl(slabp)[slabp->free]);
+ objp = index_to_obj(cachep, slabp, slab_bufctl(slabp)[slabp->active]);
+ slabp->active++;
#if DEBUG
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);
#endif
- slabp->free++;
return objp;
}
@@ -2663,7 +2660,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
WARN_ON(page_to_nid(virt_to_page(objp)) != nodeid);
/* Verify double free bug */
- for (i = slabp->free; i < cachep->num; i++) {
+ for (i = slabp->active; i < cachep->num; i++) {
if (slab_bufctl(slabp)[i] == objnr) {
printk(KERN_ERR "slab: double free detected in cache "
"'%s', objp %p\n", cachep->name, objp);
@@ -2671,9 +2668,8 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
}
}
#endif
- slabp->free--;
- slab_bufctl(slabp)[slabp->free] = objnr;
- slabp->inuse--;
+ slabp->active--;
+ slab_bufctl(slabp)[slabp->active] = objnr;
}
/*
@@ -2908,9 +2904,9 @@ retry:
* there must be at least one object available for
* allocation.
*/
- BUG_ON(slabp->inuse >= cachep->num);
+ BUG_ON(slabp->active >= cachep->num);
- while (slabp->inuse < cachep->num && batchcount--) {
+ while (slabp->active < cachep->num && batchcount--) {
STATS_INC_ALLOCED(cachep);
STATS_INC_ACTIVE(cachep);
STATS_SET_HIGH(cachep);
@@ -2921,7 +2917,7 @@ retry:
/* move slabp to correct slabp list: */
list_del(&slabp->list);
- if (slabp->free == cachep->num)
+ if (slabp->active == cachep->num)
list_add(&slabp->list, &n->slabs_full);
else
list_add(&slabp->list, &n->slabs_partial);
@@ -3206,14 +3202,14 @@ retry:
STATS_INC_ACTIVE(cachep);
STATS_SET_HIGH(cachep);
- BUG_ON(slabp->inuse == cachep->num);
+ BUG_ON(slabp->active == cachep->num);
obj = slab_get_obj(cachep, slabp, nodeid);
n->free_objects--;
/* move slabp to correct slabp list: */
list_del(&slabp->list);
- if (slabp->free == cachep->num)
+ if (slabp->active == cachep->num)
list_add(&slabp->list, &n->slabs_full);
else
list_add(&slabp->list, &n->slabs_partial);
@@ -3380,7 +3376,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects,
n->free_objects++;
/* fixup slab chains */
- if (slabp->inuse == 0) {
+ if (slabp->active == 0) {
if (n->free_objects > n->free_limit) {
n->free_objects -= cachep->num;
/* No need to drop any previously held
@@ -3441,7 +3437,7 @@ free_done:
struct slab *slabp;
slabp = list_entry(p, struct slab, list);
- BUG_ON(slabp->inuse);
+ BUG_ON(slabp->active);
i++;
p = p->next;
@@ -4066,22 +4062,22 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo)
spin_lock_irq(&n->list_lock);
list_for_each_entry(slabp, &n->slabs_full, list) {
- if (slabp->inuse != cachep->num && !error)
+ if (slabp->active != cachep->num && !error)
error = "slabs_full accounting error";
active_objs += cachep->num;
active_slabs++;
}
list_for_each_entry(slabp, &n->slabs_partial, list) {
- if (slabp->inuse == cachep->num && !error)
- error = "slabs_partial inuse accounting error";
- if (!slabp->inuse && !error)
- error = "slabs_partial/inuse accounting error";
- active_objs += slabp->inuse;
+ if (slabp->active == cachep->num && !error)
+ error = "slabs_partial accounting error";
+ if (!slabp->active && !error)
+ error = "slabs_partial accounting error";
+ active_objs += slabp->active;
active_slabs++;
}
list_for_each_entry(slabp, &n->slabs_free, list) {
- if (slabp->inuse && !error)
- error = "slabs_free/inuse accounting error";
+ if (slabp->active && !error)
+ error = "slabs_free accounting error";
num_slabs++;
}
free_objects += n->free_objects;
@@ -4243,7 +4239,7 @@ static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s)
for (i = 0, p = s->s_mem; i < c->num; i++, p += c->size) {
bool active = true;
- for (j = s->free; j < c->num; j++) {
+ for (j = s->active; j < c->num; j++) {
/* Skip freed item */
if (slab_bufctl(s)[j] == i) {
active = false;
--
1.7.9.5
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