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WL#1700 - Properly count key_blocks_used and key_blocks_current.

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Introduced a new free blocks list. Free blocks are now re-used before
new blocks are allocated from the pool. There is a new status variable 
which can be queried by "show status like key_blocks_unused".
This commit is contained in:
ingo@mysql.com 2004-05-03 15:55:21 +02:00
commit 5a78b4c746
8 changed files with 115 additions and 22 deletions
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5
include/keycache.h
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@ -57,7 +57,8 @@ typedef struct st_key_cache
int hash_links; /* max number of hash links */
int hash_links_used; /* number of hash links currently used */
int disk_blocks; /* max number of blocks in the cache */
ulong blocks_used; /* number of currently used blocks */
ulong blocks_used; /* maximum number of concurrently used blocks */
ulong blocks_unused; /* number of currently unused blocks */
ulong blocks_changed; /* number of currently dirty blocks */
ulong warm_blocks; /* number of blocks in warm sub-chain */
ulong cnt_for_resize_op; /* counter to block resize operation */
@ -65,6 +66,7 @@ typedef struct st_key_cache
HASH_LINK **hash_root; /* arr. of entries into hash table buckets */
HASH_LINK *hash_link_root; /* memory for hash table links */
HASH_LINK *free_hash_list; /* list of free hash links */
BLOCK_LINK *free_block_list; /* list of free blocks */
BLOCK_LINK *block_root; /* memory for block links */
byte HUGE_PTR *block_mem; /* memory for block buffers */
BLOCK_LINK *used_last; /* ptr to the last block of the LRU chain */
@ -87,7 +89,6 @@ typedef struct st_key_cache
ulong param_age_threshold; /* determines when hot block is downgraded */
/* Statistics variables */
ulong global_blocks_used; /* number of currently used blocks */
ulong global_blocks_changed; /* number of currently dirty blocks */
ulong global_cache_w_requests;/* number of write requests (write hits) */
ulong global_cache_write; /* number of writes from the cache to files */