buf0types.h File Reference

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Macros
#define	BUF_BUDDY_LOW_SHIFT   UNIV_ZIP_SIZE_SHIFT_MIN
#define	BUF_BUDDY_LOW   (1U << BUF_BUDDY_LOW_SHIFT)
#define	BUF_BUDDY_SIZES   (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)
#define	BUF_BUDDY_SIZES_MAX
#define	BUF_BUDDY_HIGH   (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)

Typedefs
typedef byte	buf_frame_t

Enumerations
enum	buf_flush_t { BUF_FLUSH_LRU = 0, BUF_FLUSH_LIST, BUF_FLUSH_SINGLE_PAGE, BUF_FLUSH_N_TYPES }
enum	buf_remove_t { BUF_REMOVE_ALL_NO_WRITE, BUF_REMOVE_FLUSH_NO_WRITE, BUF_REMOVE_FLUSH_WRITE }
enum	buf_io_fix { BUF_IO_NONE = 0, BUF_IO_READ, BUF_IO_WRITE, BUF_IO_PIN }
enum	srv_checksum_algorithm_t {   SRV_CHECKSUM_ALGORITHM_CRC32, SRV_CHECKSUM_ALGORITHM_STRICT_CRC32, SRV_CHECKSUM_ALGORITHM_INNODB, SRV_CHECKSUM_ALGORITHM_STRICT_INNODB,   SRV_CHECKSUM_ALGORITHM_NONE, SRV_CHECKSUM_ALGORITHM_STRICT_NONE }

Detailed Description

The database buffer pool global types for the directory

Created 11/17/1995 Heikki Tuuri

Macro Definition Documentation

#define BUF_BUDDY_HIGH   (BUF_BUDDY_LOW << BUF_BUDDY_SIZES)

twice the maximum block size of the buddy system;

the underlying memory is aligned by this amount: this must be equal to UNIV_PAGE_SIZE

#define BUF_BUDDY_LOW   (1U << BUF_BUDDY_LOW_SHIFT)

Smallest buddy page size

#define BUF_BUDDY_LOW_SHIFT   UNIV_ZIP_SIZE_SHIFT_MIN

Parameters of binary buddy system for compressed pages (buf0buddy.h) Zip shift value for the smallest page size

#define BUF_BUDDY_SIZES   (UNIV_PAGE_SIZE_SHIFT - BUF_BUDDY_LOW_SHIFT)

Actual number of buddy sizes based on current page size

#define BUF_BUDDY_SIZES_MAX

Value:

(UNIV_PAGE_SIZE_SHIFT_MAX       \
                                - BUF_BUDDY_LOW_SHIFT)

Maximum number of buddy sizes based on the max page size

Typedef Documentation

typedef byte buf_frame_t

A buffer frame.

See Also

page_t

Enumeration Type Documentation

enum buf_flush_t

Flags for flush types

Enumerator:

BUF_FLUSH_LRU	flush via the LRU list
BUF_FLUSH_LIST	flush via the flush list of dirty blocks
BUF_FLUSH_SINGLE_PAGE	flush via the LRU list but only a single page
BUF_FLUSH_N_TYPES	index of last element + 1

enum buf_io_fix

Flags for io_fix types

Enumerator:

BUF_IO_NONE	no pending I/O
BUF_IO_READ	read pending
BUF_IO_WRITE	write pending
BUF_IO_PIN	disallow relocation of block and its removal of from the flush_list

enum buf_remove_t

Algorithm to remove the pages for a tablespace from the buffer pool.

See buf_LRU_flush_or_remove_pages().

Enumerator:

BUF_REMOVE_ALL_NO_WRITE	Remove all pages from the buffer pool, don't write or sync to disk
BUF_REMOVE_FLUSH_NO_WRITE	Remove only, from the flush list, don't write or sync to disk
BUF_REMOVE_FLUSH_WRITE	Flush dirty pages to disk only don't remove from the buffer pool

enum srv_checksum_algorithm_t

Alternatives for srv_checksum_algorithm, which can be changed by

setting innodb_checksum_algorithm

Enumerator:

SRV_CHECKSUM_ALGORITHM_CRC32	Write crc32, allow crc32, innodb or none when reading
SRV_CHECKSUM_ALGORITHM_STRICT_CRC32	Write crc32, allow crc32 when reading
SRV_CHECKSUM_ALGORITHM_INNODB	Write innodb, allow crc32, innodb or none when reading
SRV_CHECKSUM_ALGORITHM_STRICT_INNODB	Write innodb, allow innodb when reading
SRV_CHECKSUM_ALGORITHM_NONE	Write none, allow crc32, innodb or none when reading
SRV_CHECKSUM_ALGORITHM_STRICT_NONE	Write none, allow none when reading