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/*****************************************************************************
Copyright (c) 1997, 2015, Oracle and/or its affiliates. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/ibuf0ibuf.ic
Insert buffer
Created 7/19/1997 Heikki Tuuri
*******************************************************/
#include "page0page.h"
#include "page0zip.h"
#include "fsp0types.h"
#include "buf0lru.h"
/** An index page must contain at least srv_page_size /
IBUF_PAGE_SIZE_PER_FREE_SPACE bytes of free space for ibuf to try to
buffer inserts to this page. If there is this much of free space, the
corresponding bits are set in the ibuf bitmap. */
#define IBUF_PAGE_SIZE_PER_FREE_SPACE 32
/***************************************************************//**
Starts an insert buffer mini-transaction. */
UNIV_INLINE
void
ibuf_mtr_start(
/*===========*/
mtr_t* mtr) /*!< out: mini-transaction */
{
mtr_start(mtr);
mtr->enter_ibuf();
}
/***************************************************************//**
Commits an insert buffer mini-transaction. */
UNIV_INLINE
void
ibuf_mtr_commit(
/*============*/
mtr_t* mtr) /*!< in/out: mini-transaction */
{
ut_ad(mtr->is_inside_ibuf());
ut_d(mtr->exit_ibuf());
mtr_commit(mtr);
}
/** Insert buffer struct */
struct ibuf_t{
ulint size; /*!< current size of the ibuf index
tree, in pages */
ulint max_size; /*!< recommended maximum size of the
ibuf index tree, in pages */
ulint seg_size; /*!< allocated pages of the file
segment containing ibuf header and
tree */
bool empty; /*!< Protected by the page
latch of the root page of the
insert buffer tree
(FSP_IBUF_TREE_ROOT_PAGE_NO). true
if and only if the insert
buffer tree is empty. */
ulint free_list_len; /*!< length of the free list */
ulint height; /*!< tree height */
dict_index_t* index; /*!< insert buffer index */
/** number of pages merged */
Atomic_counter<ulint> n_merges;
Atomic_counter<ulint> n_merged_ops[IBUF_OP_COUNT];
/*!< number of operations of each type
merged to index pages */
Atomic_counter<ulint> n_discarded_ops[IBUF_OP_COUNT];
/*!< number of operations of each type
discarded without merging due to the
tablespace being deleted or the
index being dropped */
};
/************************************************************************//**
Sets the free bit of the page in the ibuf bitmap. This is done in a separate
mini-transaction, hence this operation does not restrict further work to only
ibuf bitmap operations, which would result if the latch to the bitmap page
were kept. */
void
ibuf_set_free_bits_func(
/*====================*/
buf_block_t* block, /*!< in: index page of a non-clustered index;
free bit is reset if page level is 0 */
#ifdef UNIV_IBUF_DEBUG
ulint max_val,/*!< in: ULINT_UNDEFINED or a maximum
value which the bits must have before
setting; this is for debugging */
#endif /* UNIV_IBUF_DEBUG */
ulint val); /*!< in: value to set: < 4 */
#ifdef UNIV_IBUF_DEBUG
# define ibuf_set_free_bits(b,v,max) ibuf_set_free_bits_func(b,max,v)
#else /* UNIV_IBUF_DEBUG */
# define ibuf_set_free_bits(b,v,max) ibuf_set_free_bits_func(b,v)
#endif /* UNIV_IBUF_DEBUG */
/**********************************************************************//**
A basic partial test if an insert to the insert buffer could be possible and
recommended. */
UNIV_INLINE
ibool
ibuf_should_try(
/*============*/
dict_index_t* index, /*!< in: index where to insert */
ulint ignore_sec_unique) /*!< in: if != 0, we should
ignore UNIQUE constraint on
a secondary index when we
decide */
{
return(innodb_change_buffering
&& ibuf.max_size != 0
&& !dict_index_is_clust(index)
&& !dict_index_is_spatial(index)
&& index->table->quiesce == QUIESCE_NONE
&& (ignore_sec_unique || !dict_index_is_unique(index))
&& srv_force_recovery < SRV_FORCE_NO_IBUF_MERGE);
}
/******************************************************************//**
Returns TRUE if the current OS thread is performing an insert buffer
routine.
For instance, a read-ahead of non-ibuf pages is forbidden by threads
that are executing an insert buffer routine.
@return TRUE if inside an insert buffer routine */
UNIV_INLINE
ibool
ibuf_inside(
/*========*/
const mtr_t* mtr) /*!< in: mini-transaction */
{
return(mtr->is_inside_ibuf());
}
/** Translates the free space on a page to a value in the ibuf bitmap.
@param[in] page_size page size in bytes
@param[in] max_ins_size maximum insert size after reorganize for
the page
@return value for ibuf bitmap bits */
UNIV_INLINE
ulint
ibuf_index_page_calc_free_bits(
ulint page_size,
ulint max_ins_size)
{
ulint n;
ut_ad(ut_is_2pow(page_size));
ut_ad(page_size > IBUF_PAGE_SIZE_PER_FREE_SPACE);
n = max_ins_size / (page_size / IBUF_PAGE_SIZE_PER_FREE_SPACE);
if (n == 3) {
n = 2;
}
if (n > 3) {
n = 3;
}
return(n);
}
/*********************************************************************//**
Translates the free space on a compressed page to a value in the ibuf bitmap.
@return value for ibuf bitmap bits */
UNIV_INLINE
ulint
ibuf_index_page_calc_free_zip(
/*==========================*/
const buf_block_t* block) /*!< in: buffer block */
{
ulint max_ins_size;
const page_zip_des_t* page_zip;
lint zip_max_ins;
ut_ad(block->page.zip.data);
/* Consider the maximum insert size on the uncompressed page
without reorganizing the page. We must not assume anything
about the compression ratio. If zip_max_ins > max_ins_size and
there is 1/4 garbage on the page, recompression after the
reorganize could fail, in theory. So, let us guarantee that
merging a buffered insert to a compressed page will always
succeed without reorganizing or recompressing the page, just
by using the page modification log. */
max_ins_size = page_get_max_insert_size(
buf_block_get_frame(block), 1);
page_zip = buf_block_get_page_zip(block);
zip_max_ins = page_zip_max_ins_size(page_zip,
FALSE/* not clustered */);
if (zip_max_ins < 0) {
return(0);
} else if (max_ins_size > (ulint) zip_max_ins) {
max_ins_size = (ulint) zip_max_ins;
}
return(ibuf_index_page_calc_free_bits(block->physical_size(),
max_ins_size));
}
/*********************************************************************//**
Translates the free space on a page to a value in the ibuf bitmap.
@return value for ibuf bitmap bits */
UNIV_INLINE
ulint
ibuf_index_page_calc_free(
/*======================*/
const buf_block_t* block) /*!< in: buffer block */
{
if (!block->page.zip.data) {
ulint max_ins_size;
max_ins_size = page_get_max_insert_size_after_reorganize(
buf_block_get_frame(block), 1);
return(ibuf_index_page_calc_free_bits(
block->physical_size(), max_ins_size));
} else {
return(ibuf_index_page_calc_free_zip(block));
}
}
/************************************************************************//**
Updates the free bits of an uncompressed page in the ibuf bitmap if
there is not enough free on the page any more. This is done in a
separate mini-transaction, hence this operation does not restrict
further work to only ibuf bitmap operations, which would result if the
latch to the bitmap page were kept. NOTE: The free bits in the insert
buffer bitmap must never exceed the free space on a page. It is
unsafe to increment the bits in a separately committed
mini-transaction, because in crash recovery, the free bits could
momentarily be set too high. It is only safe to use this function for
decrementing the free bits. Should more free space become available,
we must not update the free bits here, because that would break crash
recovery. */
UNIV_INLINE
void
ibuf_update_free_bits_if_full(
/*==========================*/
buf_block_t* block, /*!< in: index page to which we have added new
records; the free bits are updated if the
index is non-clustered and non-unique and
the page level is 0, and the page becomes
fuller */
ulint max_ins_size,/*!< in: value of maximum insert size with
reorganize before the latest operation
performed to the page */
ulint increase)/*!< in: upper limit for the additional space
used in the latest operation, if known, or
ULINT_UNDEFINED */
{
ulint before;
ulint after;
ut_ad(buf_block_get_page_zip(block) == NULL);
before = ibuf_index_page_calc_free_bits(
srv_page_size, max_ins_size);
if (max_ins_size >= increase) {
compile_time_assert(ULINT32_UNDEFINED > UNIV_PAGE_SIZE_MAX);
after = ibuf_index_page_calc_free_bits(
srv_page_size, max_ins_size - increase);
#ifdef UNIV_IBUF_DEBUG
ut_a(after <= ibuf_index_page_calc_free(block));
#endif
} else {
after = ibuf_index_page_calc_free(block);
}
if (after == 0) {
/* We move the page to the front of the buffer pool LRU list:
the purpose of this is to prevent those pages to which we
cannot make inserts using the insert buffer from slipping
out of the buffer pool */
buf_page_make_young(&block->page);
}
if (before > after) {
ibuf_set_free_bits(block, after, before);
}
}
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