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8b00501bea
allocating compressed page frames or their control blocks. Also note that if buf_buddy_alloc() is used for allocating a control block, it must be initialized before releasing buf_pool->mutex. buf_page_init_for_read(): When the page hash check fails after buf_buddy_alloc(), free the uninitialized control block before freeing the compressed page frame. This fixes a potential error in buf_buddy_relocate_block().
72 lines
2.4 KiB
C
72 lines
2.4 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 == BUF_BUDDY_USE_LRU. This function should only be used for
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allocating compressed page frames or control blocks (buf_page_t).
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Allocated control blocks must be properly initialized immediately
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after 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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/** Number of frames allocated from the buffer pool to the buddy system.
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Protected by buf_pool->mutex. */
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extern ulint buf_buddy_n_frames;
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/** Preferred minimum number of frames allocated from the buffer pool
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to the buddy system. When this number is exceeded, the buddy allocator
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will not try to free clean compressed-only pages in order to satisfy
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an allocation request. Protected by buf_pool->mutex. */
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extern ulint buf_buddy_min_n_frames;
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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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#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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