diff options
Diffstat (limited to 'storage/innobase/include/buf0lru.h')
| -rw-r--r-- | storage/innobase/include/buf0lru.h | 48 |
1 files changed, 16 insertions, 32 deletions
diff --git a/storage/innobase/include/buf0lru.h b/storage/innobase/include/buf0lru.h index 937cb427a47..540c14a49c9 100644 --- a/storage/innobase/include/buf0lru.h +++ b/storage/innobase/include/buf0lru.h @@ -34,6 +34,9 @@ Created 11/5/1995 Heikki Tuuri struct trx_t; struct fil_space_t; +/** Flush this many pages in buf_LRU_get_free_block() */ +extern size_t innodb_lru_flush_size; + /*####################################################################### These are low-level functions #########################################################################*/ @@ -41,21 +44,6 @@ These are low-level functions /** Minimum LRU list length for which the LRU_old pointer is defined */ #define BUF_LRU_OLD_MIN_LEN 512 /* 8 megabytes of 16k pages */ -/** Empty the flush list for all pages belonging to a tablespace. -@param[in] id tablespace identifier -@param[in] flush whether to write the pages to files -@param[in] first first page to be flushed or evicted */ -void buf_LRU_flush_or_remove_pages(ulint id, bool flush, ulint first = 0); - -#ifdef UNIV_DEBUG -/********************************************************************//** -Insert a compressed block into buf_pool.zip_clean in the LRU order. */ -void -buf_LRU_insert_zip_clean( -/*=====================*/ - buf_page_t* bpage); /*!< in: pointer to the block in question */ -#endif /* UNIV_DEBUG */ - /** Try to free a block. If bpage is a descriptor of a compressed-only ROW_FORMAT=COMPRESSED page, the buf_page_t object will be freed as well. The caller must hold buf_pool.mutex. @@ -67,38 +55,34 @@ bool buf_LRU_free_page(buf_page_t *bpage, bool zip) MY_ATTRIBUTE((nonnull)); /** Try to free a replaceable block. -@param[in] scan_all true=scan the whole LRU list, - false=use BUF_LRU_SEARCH_SCAN_THRESHOLD +@param limit maximum number of blocks to scan @return true if found and freed */ -bool buf_LRU_scan_and_free_block(bool scan_all); +bool buf_LRU_scan_and_free_block(ulint limit= ULINT_UNDEFINED); /** @return a buffer block from the buf_pool.free list @retval NULL if the free list is empty */ buf_block_t* buf_LRU_get_free_only(); -/** Get a free block from the buf_pool. The block is taken off the -free list. If free list is empty, blocks are moved from the end of the -LRU list to the free list. +/** Get a block from the buf_pool.free list. +If the list is empty, blocks will be moved from the end of buf_pool.LRU +to buf_pool.free. This function is called from a user thread when it needs a clean block to read in a page. Note that we only ever get a block from the free list. Even when we flush a page or find a page in LRU scan we put it to free list to be used. * iteration 0: - * get a block from free list, success:done + * get a block from the buf_pool.free list, success:done * if buf_pool.try_LRU_scan is set - * scan LRU up to srv_LRU_scan_depth to find a clean block - * the above will put the block on free list + * scan LRU up to 100 pages to free a clean block * success:retry the free list - * flush one dirty page from tail of LRU to disk - * the above will put the block on free list + * flush up to innodb_lru_flush_size LRU blocks to data files + (until UT_LIST_GET_GEN(buf_pool.free) < innodb_lru_scan_depth) + * on buf_page_write_complete() the blocks will put on buf_pool.free list * success: retry the free list -* iteration 1: - * same as iteration 0 except: - * scan whole LRU list - * scan LRU list even if buf_pool.try_LRU_scan is not set -* iteration > 1: - * same as iteration 1 but sleep 10ms +* subsequent iterations: same as iteration 0 except: + * scan whole LRU list + * scan LRU list even if buf_pool.try_LRU_scan is not set @param have_mutex whether buf_pool.mutex is already being held @return the free control block, in state BUF_BLOCK_MEMORY */ |