buf0buddy.h File Reference

Binary buddy allocator for compressed pages. More...

#include "buf0types.h"
#include "univ.i"
#include "buf0buddy.ic"

Go to the source code of this file.

Functions
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...
bool	buf_buddy_realloc (buf_pool_t *buf_pool, void *buf, ulint size)
	Try to reallocate a block. More...
void	buf_buddy_condense_free (buf_pool_t *buf_pool)
	Combine all pairs of free buddies. 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_condense_free()

void buf_buddy_condense_free

(

buf_pool_t *

buf_pool

)

Combine all pairs of free buddies.

Parameters

[in]

buf_pool

buffer pool instance

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_realloc()

bool buf_buddy_realloc	(	buf_pool_t *	buf_pool,
		void *	buf,
		ulint	size
	)

Try to reallocate a block.

Parameters

[in]	buf_pool	buffer pool instance
[in]	buf	block to be reallocated, must be pointed to by the buffer pool
[in]	size	block size, up to UNIV_PAGE_SIZE

Return values

true	if succeeded or if failed because the block was fixed
false	if failed because of no free blocks.