buf0buddy.ic File Reference

Binary buddy allocator for compressed pages. More...

#include "buf0buddy.h"
#include "buf0buf.h"

Functions
void *	buf_buddy_alloc_low (buf_pool_t *buf_pool, ulint i)
	Allocate a block. More...
void	buf_buddy_free_low (buf_pool_t *buf_pool, void *buf, ulint i, bool has_zip_free)
	Deallocate a block. More...
static ulint	buf_buddy_get_slot (ulint size)
	Get the index of buf_pool->zip_free[] for a given block size. More...
static byte *	buf_buddy_alloc (buf_pool_t *buf_pool, ulint size)
	Allocate a block. More...
static void	buf_buddy_free (buf_pool_t *buf_pool, void *buf, ulint size)
	Deallocate a block. More...

Detailed Description

Binary buddy allocator for compressed pages.

Created December 2006 by Marko Makela

Function Documentation

buf_buddy_alloc()

static byte * buf_buddy_alloc ( buf_pool_t *  buf_pool, ulint  size  )

inlinestatic

Allocate a block.

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

Parameters

[in,out]	buf_pool	buffer pool in which the page resides
[in]	size	compressed page size, between UNIV_ZIP_SIZE_MIN and UNIV_PAGE_SIZE

Returns

allocated block, never NULL

buf_buddy_alloc_low()

void * buf_buddy_alloc_low	(	buf_pool_t *	buf_pool,
		ulint	i
	)

Allocate a block.

Parameters

[in,out]	buf_pool	buffer pool instance
[in]	i	index of buf_pool->zip_free[] or BUF_BUDDY_SIZES

Returns

allocated block, never NULL

buf_buddy_free()

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

inlinestatic

Deallocate a block.

Parameters

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

buf_buddy_free_low()

void buf_buddy_free_low	(	buf_pool_t *	buf_pool,
		void *	buf,
		ulint	i,
		bool	has_zip_free
	)

Deallocate a block.

Parameters

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

buf_buddy_get_slot()

static ulint buf_buddy_get_slot ( ulint  size )

inlinestatic

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