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blocks that contains uncompressed and compressed frames. This patch was designed by Heikki and Inaam, implemented by Inaam, and refined and reviewed by Marko and Sunny. buf_buddy_n_frames, buf_buddy_min_n_frames, buf_buddy_max_n_frames: Remove. buf_page_belongs_to_unzip_LRU(): New predicate: bpage->zip.data && buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE. buf_pool_t, buf_block_t: Add the linked list unzip_LRU. A block in the regular LRU list is in unzip_LRU iff buf_page_belongs_to_unzip_LRU() holds. buf_LRU_free_block(): Add a third return value to refine the case "cannot free the block". buf_LRU_search_and_free_block(): Update the documentation to reflect the implementation. buf_LRU_stat_t, buf_LRU_stat_cur, buf_LRU_stat_sum, buf_LRU_stat_arr[]: Statistics for the unzip_LRU algorithm. buf_LRU_stat_update(): New function: Update the statistics. Called once per second by srv_error_monitor_thread(). buf_LRU_validate(): Validate the unzip_LRU list as well. buf_LRU_evict_from_unzip_LRU(): New predicate: Use the unzip_LRU before falling back to the regular LRU? buf_LRU_free_from_unzip_LRU_list(), buf_LRU_free_from_common_LRU_list(): Subfunctions of buf_LRU_search_and_free_block(). buf_LRU_search_and_free_block(): Reimplement. Try to evict an uncompressed page from the unzip_LRU list before falling back to evicting an entire block from the common LRU list. buf_unzip_LRU_remove_block_if_needed(): New function. buf_unzip_LRU_add_block(): New function: Add a block to the unzip_LRU list.
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/******************************************************
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Binary buddy allocator for compressed pages
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(c) 2006 Innobase Oy
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Created December 2006 by Marko Makela
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*******************************************************/
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#ifndef buf0buddy_h
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#define buf0buddy_h
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#ifdef UNIV_MATERIALIZE
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# undef UNIV_INLINE
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# define UNIV_INLINE
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#endif
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#include "univ.i"
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#include "buf0types.h"
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/**************************************************************************
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Allocate a block. The thread calling this function must hold
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buf_pool_mutex and must not hold buf_pool_zip_mutex or any
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block->mutex. The buf_pool_mutex may only be released and reacquired
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if lru != NULL. This function should only be used for allocating
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compressed page frames or control blocks (buf_page_t). Allocated
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control blocks must be properly initialized immediately after
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buf_buddy_alloc() has returned the memory, before releasing
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buf_pool_mutex. */
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UNIV_INLINE
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void*
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buf_buddy_alloc(
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/*============*/
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/* out: allocated block,
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possibly NULL if lru == NULL */
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ulint size, /* in: block size, up to UNIV_PAGE_SIZE */
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ibool* lru) /* in: pointer to a variable that will be assigned
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TRUE if storage was allocated from the LRU list
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and buf_pool_mutex was temporarily released,
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or NULL if the LRU list should not be used */
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__attribute__((malloc));
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/**************************************************************************
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Release a block. */
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UNIV_INLINE
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void
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buf_buddy_free(
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/*===========*/
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void* buf, /* in: block to be freed, must not be
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pointed to by the buffer pool */
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ulint size) /* in: block size, up to UNIV_PAGE_SIZE */
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__attribute__((nonnull));
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/** Counts of blocks allocated from the buddy system.
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Protected by buf_pool_mutex. */
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extern ulint buf_buddy_used[BUF_BUDDY_SIZES + 1];
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/** Counts of blocks relocated by the buddy system.
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Protected by buf_pool_mutex. */
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extern ib_uint64_t buf_buddy_relocated[BUF_BUDDY_SIZES + 1];
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/** Durations of block relocations.
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Protected by buf_pool_mutex. */
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extern ullint buf_buddy_relocated_duration[BUF_BUDDY_SIZES + 1];
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#ifndef UNIV_NONINL
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# include "buf0buddy.ic"
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#endif
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#endif /* buf0buddy_h */
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