uint8_t item_slabid(uint16_t nkey, uint32_t nbyte) {
size_t ntotal;
uint8_t id;
ntotal = item_ntotal(nkey, nbyte);
id = slab_id(ntotal);
return id;
}
/*
* Allocate an item. We allocate an item by consuming the next free item
* from slab of the item's slab class.
*
* On success we return the pointer to the allocated item.
*/
static item_rstatus_e
_item_alloc(struct item **it_p, uint8_t klen, uint32_t vlen, uint8_t olen)
{
uint8_t id = slab_id(item_ntotal(klen, vlen, olen));
struct item *it;
log_verb("allocate item with klen %u vlen %u", klen, vlen);
*it_p = NULL;
if (id == SLABCLASS_INVALID_ID) {
return ITEM_EOVERSIZED;
}
it = slab_get_item(id);
*it_p = it;
if (it != NULL) {
_item_reset(it);
slab_ref(item_to_slab(it)); /* slab to be deref'ed in _item_link */
INCR(slab_metrics, item_curr);
INCR(slab_metrics, item_alloc);
PERSLAB_INCR(id, item_curr);
log_verb("alloc it %p of id %"PRIu8" at offset %"PRIu32, it, it->id,
it->offset);
return ITEM_OK;
} else {
INCR(slab_metrics, item_alloc_ex);
log_warn("server error on allocating item in slab %"PRIu8, id);
return ITEM_ENOMEM;
}
}