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3fd65809a7
in the function comment. There is no value BUF_BUDDY_USE_LRU. The mistake was made in r1290.
112 lines
3.3 KiB
Text
112 lines
3.3 KiB
Text
/******************************************************
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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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#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 "buf0buf.h"
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#include "buf0buddy.h"
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#include "ut0ut.h"
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#include "sync0sync.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 block->mutex.
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The buf_pool_mutex may only be released and reacquired if lru != NULL. */
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UNIV_INTERN
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void*
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buf_buddy_alloc_low(
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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 i, /* in: index of buf_pool->zip_free[],
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or BUF_BUDDY_SIZES */
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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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Deallocate a block. */
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UNIV_INTERN
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void
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buf_buddy_free_low(
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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 i) /* in: index of buf_pool->zip_free[],
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or BUF_BUDDY_SIZES */
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__attribute__((nonnull));
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/**************************************************************************
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Get the index of buf_pool->zip_free[] for a given block size. */
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UNIV_INLINE
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ulint
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buf_buddy_get_slot(
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/*===============*/
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/* out: index of buf_pool->zip_free[],
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or BUF_BUDDY_SIZES */
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ulint size) /* in: block size */
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{
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ulint i;
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ulint s;
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for (i = 0, s = BUF_BUDDY_LOW; s < size; i++, s <<= 1);
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ut_ad(i <= BUF_BUDDY_SIZES);
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return(i);
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}
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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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{
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ut_ad(buf_pool_mutex_own());
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return(buf_buddy_alloc_low(buf_buddy_get_slot(size), lru));
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}
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/**************************************************************************
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Deallocate 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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{
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ut_ad(buf_pool_mutex_own());
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buf_buddy_free_low(buf, buf_buddy_get_slot(size));
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}
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#ifdef UNIV_MATERIALIZE
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# undef UNIV_INLINE
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# define UNIV_INLINE UNIV_INLINE_ORIGINAL
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#endif
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