buf0buddy.ic File Reference

#include "buf0buf.h"
#include "buf0buddy.h"
#include "ut0ut.h"
#include "sync0sync.h"

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Functions
UNIV_INTERN void *	buf_buddy_alloc_low (buf_pool_t *buf_pool, ulint i, ibool *lru))
UNIV_INTERN void	buf_buddy_free_low (buf_pool_t *buf_pool, void *buf, ulint i))
UNIV_INLINE ulint	buf_buddy_get_slot (ulint size)
UNIV_INLINE byte *	buf_buddy_alloc (buf_pool_t *buf_pool, ulint size, ibool *lru)
UNIV_INLINE void	buf_buddy_free (buf_pool_t *buf_pool, void *buf, ulint size)

Detailed Description

Binary buddy allocator for compressed pages

Created December 2006 by Marko Makela

Function Documentation

UNIV_INLINE byte* buf_buddy_alloc	(	buf_pool_t *	buf_pool,
		ulint	size,
		ibool *	lru
	)

Allocate a block. The thread calling this function must hold buf_pool->mutex and must not hold buf_pool->zip_mutex or any block->mutex. The buf_pool->mutex may be released and reacquired. This function should only be used for allocating compressed page frames.

Returns

allocated block, never NULL

Parameters

buf_pool	in/out: buffer pool in which the page resides
size	in: compressed page size (between UNIV_ZIP_SIZE_MIN and UNIV_PAGE_SIZE)
lru	in: pointer to a variable that will be assigned TRUE if storage was allocated from the LRU list and buf_pool->mutex was temporarily released

UNIV_INTERN void* buf_buddy_alloc_low	(	buf_pool_t *	buf_pool,
		ulint	i,
		ibool *	lru
	)

Allocate a block. The thread calling this function must hold buf_pool->mutex and must not hold buf_pool->zip_mutex or any block->mutex. The buf_pool_mutex may be released and reacquired.

Returns

allocated block, never NULL

Parameters

buf_pool	in/out: buffer pool instance
i	in: index of buf_pool->zip_free[], or BUF_BUDDY_SIZES
lru	in: pointer to a variable that will be assigned TRUE if storage was allocated from the LRU list and buf_pool->mutex was temporarily released

UNIV_INLINE void buf_buddy_free	(	buf_pool_t *	buf_pool,
		void *	buf,
		ulint	size
	)

Deallocate a block.

Parameters

buf_pool	in/out: buffer pool in which the block resides
buf	in: block to be freed, must not be pointed to by the buffer pool
size	in: block size, up to UNIV_PAGE_SIZE

UNIV_INTERN void buf_buddy_free_low	(	buf_pool_t *	buf_pool,
		void *	buf,
		ulint	i
	)

Deallocate a block.

Parameters

buf_pool	in: buffer pool instance
buf	in: block to be freed, must not be pointed to by the buffer pool
i	in: index of buf_pool->zip_free[], or BUF_BUDDY_SIZES

UNIV_INLINE ulint buf_buddy_get_slot

(

ulint

size

)

Get the index of buf_pool->zip_free[] for a given block size.

Returns

index of buf_pool->zip_free[], or BUF_BUDDY_SIZES

Parameters

size	in: block size