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twice the maximum block size of the buddy system. buf_page_t: Note that state may change from BUF_BLOCK_READY_FOR_USE to BUF_BLOCK_MEMORY without buf_page_get_mutex() protection [only buf_pool->mutex]. buf_buddy_get_slot(): Extend the output to BUF_BUDDY_SIZES. buf_buddy_alloc(), buf_buddy_free(): Allow sizes up to UNIV_PAGE_SIZE. buf_buddy_alloc_low(), buf_buddy_free_low(), buf_buddy_alloc_clean(): Allow i==BUF_BUDDY_SIZES.
122 lines
3 KiB
Text
122 lines
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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#ifdef UNIV_SYNC_DEBUG
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# include "sync0sync.h"
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#endif /* UNIV_SYNC_DEBUG */
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/**************************************************************************
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Allocate a block. */
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void*
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buf_buddy_alloc_low(
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/*================*/
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/* out: pointer to the start of the block */
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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: TRUE=allocate from the LRU list if needed */
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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 offset of the buddy of a compressed page frame. */
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UNIV_INLINE
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lint
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buf_buddy_get_offset(
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/*=================*/
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/* out: offset of the buddy relative to page */
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const void* page, /* in: compressed page */
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ulint size) /* in: page size in bytes */
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{
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ut_ad(ut_is_2pow(size));
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ut_ad(size >= BUF_BUDDY_LOW);
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ut_ad(size < BUF_BUDDY_HIGH);
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if (((ulint) page) & size) {
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return(-(lint) size);
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} else {
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return((lint) size);
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}
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}
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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. */
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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: pointer to the start of the block */
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ulint size, /* in: block size, up to UNIV_PAGE_SIZE */
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ibool lru) /* in: TRUE=allocate from the LRU list if needed */
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{
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#ifdef UNIV_SYNC_DEBUG
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ut_a(mutex_own(&buf_pool->mutex));
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#endif /* UNIV_SYNC_DEBUG */
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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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#ifdef UNIV_SYNC_DEBUG
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ut_a(mutex_own(&buf_pool->mutex));
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#endif /* UNIV_SYNC_DEBUG */
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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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