Probe into memory management of Memcache

Slab Dispenser : http://blog.csdn.net/luotuo44/article/details/42737181

Hash operation : http://blog.csdn.net/luotuo44/article/details/42773231

LRU operation : http://blog.csdn.net/luotuo44/article/details/42869325

configuration Parameters : http://blog.csdn.net/luotuo44/article/details/42672913

Core structural Body

typedef struct _STRITEM {struct _stritem *next;    struct _stritem *prev;    struct _stritem *h_next;       /* Hash Chain Next */rel_time_t time;    /* Least recent Access */rel_time_t exptime;     /* Expire time */int nbytes;    /* Size of data */unsigned short refcount;    uint8_t Nsuffix;   /* Length of flags-and-length String */uint8_t it_flags;       /* item_* above */uint8_t slabs_clsid;/* which slab class we ' re in */uint8_t nkey;     /* Key length, w/terminating null and padding */uint64_t cas_id;    /* The CAS identifier */void * end[]; /* Then null-terminated key */* then "flags length\r\n" (no terminating null) */* then data with terminating \ r      \ n (no terminating null; it ' s binary!) */} item;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_total;   /* Size of previous array */unsigned int sl_curr;         /* First free slot */void *end_page_ptr; /* Pointer to next free item at end of page, or 0 */unsigned int end_page_free;     /* Number of items remaining at end of the last alloced page */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 */unsigned int killing; /* index+1 of dying slab, or zero if none */} slabclass_t;

　　

Probe into memory management of Memcache