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75cf6705ac
buf_buddy_alloc() until after the block has been found not to exist in the buffer pool. buf_buddy_alloc(), buf_buddy_alloc_low(): Make lru an output parameter. Improve documentation. buf_page_init_for_read(): Simplify the code. Check buf_page_hash_get() again if buf_buddy_alloc() released buf_pool->mutex.
109 lines
3.1 KiB
Text
109 lines
3.1 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
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lru == BUF_BUDDY_USE_LRU. */
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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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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 block->mutex.
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The buf_pool->mutex may only be released and reacquired if
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lru == BUF_BUDDY_USE_LRU. */
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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(mutex_own(&buf_pool->mutex));
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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(mutex_own(&buf_pool->mutex));
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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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