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Subject[PATCH v2 12/15] slab: replace free and inuse in struct slab with newly introduced active
Date
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@lge.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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