61
59
typedef struct st_key_cache
63
bool key_cache_inited;
64
bool in_resize; /* true during resize operation */
65
bool resize_in_flush; /* true during flush of resize operation */
66
bool can_be_used; /* usage of cache for read/write is allowed */
61
my_bool key_cache_inited;
62
my_bool in_resize; /* true during resize operation */
63
my_bool resize_in_flush; /* true during flush of resize operation */
64
my_bool can_be_used; /* usage of cache for read/write is allowed */
67
65
size_t key_cache_mem_size; /* specified size of the cache memory */
68
uint32_t key_cache_block_size; /* size of the page buffer of a cache block */
66
uint key_cache_block_size; /* size of the page buffer of a cache block */
69
67
ulong min_warm_blocks; /* min number of warm blocks; */
70
68
ulong age_threshold; /* age threshold for hot blocks */
71
uint64_t keycache_time; /* total number of block link operations */
72
uint32_t hash_entries; /* max number of entries in the hash table */
69
ulonglong keycache_time; /* total number of block link operations */
70
uint hash_entries; /* max number of entries in the hash table */
73
71
int hash_links; /* max number of hash links */
74
72
int hash_links_used; /* number of hash links currently used */
75
73
int disk_blocks; /* max number of blocks in the cache */
104
102
initializing the key cache.
107
uint64_t param_buff_size; /* size the memory allocated for the cache */
105
ulonglong param_buff_size; /* size the memory allocated for the cache */
108
106
ulong param_block_size; /* size of the blocks in the key cache */
109
107
ulong param_division_limit; /* min. percentage of warm blocks */
110
108
ulong param_age_threshold; /* determines when hot block is downgraded */
112
110
/* Statistics variables. These are reset in reset_key_cache_counters(). */
113
111
ulong global_blocks_changed; /* number of currently dirty blocks */
114
uint64_t global_cache_w_requests;/* number of write requests (write hits) */
115
uint64_t global_cache_write; /* number of writes from cache to files */
116
uint64_t global_cache_r_requests;/* number of read requests (read hits) */
117
uint64_t global_cache_read; /* number of reads from files to cache */
112
ulonglong global_cache_w_requests;/* number of write requests (write hits) */
113
ulonglong global_cache_write; /* number of writes from cache to files */
114
ulonglong global_cache_r_requests;/* number of read requests (read hits) */
115
ulonglong global_cache_read; /* number of reads from files to cache */
119
117
int blocks; /* max number of blocks in the cache */
120
bool in_init; /* Set to 1 in MySQL during init/resize */
118
my_bool in_init; /* Set to 1 in MySQL during init/resize */
123
121
/* The default key cache */
124
122
extern KEY_CACHE dflt_key_cache_var, *dflt_key_cache;
126
extern int init_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
127
size_t use_mem, uint32_t division_limit,
128
uint32_t age_threshold);
129
extern int resize_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
130
size_t use_mem, uint32_t division_limit,
131
uint32_t age_threshold);
132
extern void change_key_cache_param(KEY_CACHE *keycache, uint32_t division_limit,
133
uint32_t age_threshold);
134
extern unsigned char *key_cache_read(KEY_CACHE *keycache,
124
extern int init_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
125
size_t use_mem, uint division_limit,
127
extern int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
128
size_t use_mem, uint division_limit,
130
extern void change_key_cache_param(KEY_CACHE *keycache, uint division_limit,
132
extern uchar *key_cache_read(KEY_CACHE *keycache,
135
133
File file, my_off_t filepos, int level,
136
unsigned char *buff, uint32_t length,
137
uint32_t block_length,int return_buffer);
134
uchar *buff, uint length,
135
uint block_length,int return_buffer);
138
136
extern int key_cache_insert(KEY_CACHE *keycache,
139
137
File file, my_off_t filepos, int level,
140
unsigned char *buff, uint32_t length);
138
uchar *buff, uint length);
141
139
extern int key_cache_write(KEY_CACHE *keycache,
142
140
File file, my_off_t filepos, int level,
143
unsigned char *buff, uint32_t length,
144
uint32_t block_length,int force_write);
141
uchar *buff, uint length,
142
uint block_length,int force_write);
145
143
extern int flush_key_blocks(KEY_CACHE *keycache,
146
144
int file, enum flush_type type);
147
extern void end_key_cache(KEY_CACHE *keycache, bool cleanup);
145
extern void end_key_cache(KEY_CACHE *keycache, my_bool cleanup);
149
147
/* Functions to handle multiple key caches */
150
extern bool multi_keycache_init(void);
148
extern my_bool multi_keycache_init(void);
151
149
extern void multi_keycache_free(void);
152
extern KEY_CACHE *multi_key_cache_search(unsigned char *key, uint32_t length);
153
extern bool multi_key_cache_set(const unsigned char *key, uint32_t length,
150
extern KEY_CACHE *multi_key_cache_search(uchar *key, uint length);
151
extern my_bool multi_key_cache_set(const uchar *key, uint length,
154
152
KEY_CACHE *key_cache);
155
153
extern void multi_key_cache_change(KEY_CACHE *old_data,
156
154
KEY_CACHE *new_data);
157
155
extern int reset_key_cache_counters(const char *name,
158
156
KEY_CACHE *key_cache);
164
158
#endif /* _keycache_h */