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120 lines
4.3 KiB
C
120 lines
4.3 KiB
C
/******************************************************
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The database buffer pool flush algorithm
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(c) 1995 Innobase Oy
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Created 11/5/1995 Heikki Tuuri
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*******************************************************/
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#ifndef buf0flu_h
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#define buf0flu_h
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#include "univ.i"
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#include "buf0types.h"
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#include "ut0byte.h"
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#include "mtr0types.h"
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/************************************************************************
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Updates the flush system data structures when a write is completed. */
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void
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buf_flush_write_complete(
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/*=====================*/
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buf_block_t* block); /* in: pointer to the block in question */
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/*************************************************************************
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Flushes pages from the end of the LRU list if there is too small
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a margin of replaceable pages there. */
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void
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buf_flush_free_margin(void);
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/*=======================*/
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/************************************************************************
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Initializes a page for writing to the tablespace. */
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void
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buf_flush_init_for_writing(
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/*=======================*/
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byte* page, /* in: page */
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dulint newest_lsn, /* in: newest modification lsn to the page */
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ulint space, /* in: space id */
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ulint page_no); /* in: page number */
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/***********************************************************************
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This utility flushes dirty blocks from the end of the LRU list or flush_list.
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NOTE 1: in the case of an LRU flush the calling thread may own latches to
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pages: to avoid deadlocks, this function must be written so that it cannot
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end up waiting for these latches! NOTE 2: in the case of a flush list flush,
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the calling thread is not allowed to own any latches on pages! */
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ulint
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buf_flush_batch(
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/*============*/
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/* out: number of blocks for which the write
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request was queued */
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ulint flush_type, /* in: BUF_FLUSH_LRU or BUF_FLUSH_LIST; if
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BUF_FLUSH_LIST, then the caller must not own
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any latches on pages */
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ulint min_n, /* in: wished minimum mumber of blocks flushed
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(it is not guaranteed that the actual number
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is that big, though) */
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dulint lsn_limit); /* in the case BUF_FLUSH_LIST all blocks whose
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oldest_modification is smaller than this
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should be flushed (if their number does not
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exceed min_n), otherwise ignored */
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/**********************************************************************
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Waits until a flush batch of the given type ends */
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void
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buf_flush_wait_batch_end(
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/*=====================*/
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ulint type); /* in: BUF_FLUSH_LRU or BUF_FLUSH_LIST */
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/************************************************************************
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This function should be called at a mini-transaction commit, if a page was
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modified in it. Puts the block to the list of modified blocks, if it not
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already in it. */
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UNIV_INLINE
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void
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buf_flush_note_modification(
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/*========================*/
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buf_block_t* block, /* in: block which is modified */
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mtr_t* mtr); /* in: mtr */
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/************************************************************************
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This function should be called when recovery has modified a buffer page. */
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UNIV_INLINE
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void
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buf_flush_recv_note_modification(
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/*=============================*/
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buf_block_t* block, /* in: block which is modified */
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dulint start_lsn, /* in: start lsn of the first mtr in a
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set of mtr's */
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dulint end_lsn); /* in: end lsn of the last mtr in the
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set of mtr's */
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/************************************************************************
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Returns TRUE if the file page block is immediately suitable for replacement,
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i.e., transition FILE_PAGE => NOT_USED allowed. */
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ibool
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buf_flush_ready_for_replace(
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/*========================*/
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/* out: TRUE if can replace immediately */
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buf_block_t* block); /* in: buffer control block, must be in state
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BUF_BLOCK_FILE_PAGE and in the LRU list */
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/**********************************************************************
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Validates the flush list. */
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ibool
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buf_flush_validate(void);
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/*====================*/
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/* out: TRUE if ok */
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/* When buf_flush_free_margin is called, it tries to make this many blocks
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available to replacement in the free list and at the end of the LRU list (to
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make sure that a read-ahead batch can be read efficiently in a single
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sweep). */
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#define BUF_FLUSH_FREE_BLOCK_MARGIN (5 + BUF_READ_AHEAD_AREA)
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#define BUF_FLUSH_EXTRA_MARGIN (BUF_FLUSH_FREE_BLOCK_MARGIN / 4 + 100)
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#ifndef UNIV_NONINL
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#include "buf0flu.ic"
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#endif
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#endif
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