I recently started going through memcached source code and i came across this structure. Based on my understanding, there are approximately 64 slabs and and each slab represents a unique chunk size. If we took the first slab class ( size 80 , say ) then the pages which are belongs to this slab will have it's memory broken into 80 bytes.
typedef struct {
unsigned int size; // sizes of items
unsigned int perslab; // how many items per slab
void *slots; // list of item ptrs
unsigned int sl_curr; // total free items in list
unsigned int slabs; // how many slabs were allocated for this class
void **slab_list; // array of slab pointers
unsigned int list_size; // size of prev array
size_t requested; // The number of requested bytes
} slabclass_t;
I do not understand this line,
unsigned int slabs; // how many slabs were allocated for this class
What does he mean by how many slabs were allocated for a slab class? Every slab class must be unique right? why will there be multiple slabs within one slab class? Am i missing something?
