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0fb620f58d
buf_flush_remove(): New function, for removing a block from the flush list. Sliced from buf_flush_write_complete(). buf_page_set_state(): Allow transitions between BUF_BLOCK_ZIP_PAGE and BUF_BLOCK_ZIP_DIRTY.
133 lines
4.7 KiB
C
133 lines
4.7 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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Remove a block from the flush list of modified blocks. */
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void
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buf_flush_remove(
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/*=============*/
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buf_page_t* bpage); /* in: pointer to the block in question */
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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_page_t* bpage); /* 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/out: page */
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void* page_zip_, /* in/out: compressed page, or NULL */
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ib_uint64_t newest_lsn); /* in: newest modification lsn
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to the page */
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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
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write request was queued;
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ULINT_UNDEFINED if there was a flush
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of the same type already running */
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enum buf_flush flush_type, /* in: BUF_FLUSH_LRU or
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BUF_FLUSH_LIST; if BUF_FLUSH_LIST,
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then the caller must not own any
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latches on pages */
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ulint min_n, /* in: wished minimum mumber of blocks
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flushed (it is not guaranteed that the
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actual number is that big, though) */
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ib_uint64_t lsn_limit); /* in the case BUF_FLUSH_LIST all
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blocks whose oldest_modification is
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smaller than this should be flushed
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(if their number does not exceed
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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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enum buf_flush 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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ib_uint64_t start_lsn, /* in: start lsn of the first mtr in a
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set of mtr's */
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ib_uint64_t 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_page_t* bpage); /* in: buffer control block, must be
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buf_page_in_file(bpage) and in the LRU list */
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#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
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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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#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
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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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