/
buf0flu.cc
3848 lines (3142 loc) · 104 KB
/
buf0flu.cc
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/*****************************************************************************
Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2013, 2018, MariaDB Corporation.
Copyright (c) 2013, 2014, Fusion-io
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, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file buf/buf0flu.cc
The database buffer buf_pool flush algorithm
Created 11/11/1995 Heikki Tuuri
*******************************************************/
#include "ha_prototypes.h"
#include <mysql/service_thd_wait.h>
#include <my_dbug.h>
#include <sql_class.h>
#include "buf0flu.h"
#include "buf0buf.h"
#include "buf0checksum.h"
#include "srv0start.h"
#include "srv0srv.h"
#include "page0zip.h"
#include "ut0byte.h"
#include "page0page.h"
#include "fil0fil.h"
#include "buf0lru.h"
#include "buf0rea.h"
#include "ibuf0ibuf.h"
#include "log0log.h"
#include "os0file.h"
#include "trx0sys.h"
#include "srv0mon.h"
#include "fsp0sysspace.h"
#include "ut0stage.h"
#include "fil0pagecompress.h"
#ifdef UNIV_LINUX
/* include defs for CPU time priority settings */
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/resource.h>
static const int buf_flush_page_cleaner_priority = -20;
#endif /* UNIV_LINUX */
/** Sleep time in microseconds for loop waiting for the oldest
modification lsn */
static const ulint buf_flush_wait_flushed_sleep_time = 10000;
#include <my_service_manager.h>
/** Number of pages flushed through non flush_list flushes. */
static ulint buf_lru_flush_page_count = 0;
/** Flag indicating if the page_cleaner is in active state. This flag
is set to TRUE by the page_cleaner thread when it is spawned and is set
back to FALSE at shutdown by the page_cleaner as well. Therefore no
need to protect it by a mutex. It is only ever read by the thread
doing the shutdown */
bool buf_page_cleaner_is_active;
/** Factor for scan length to determine n_pages for intended oldest LSN
progress */
static ulint buf_flush_lsn_scan_factor = 3;
/** Average redo generation rate */
static lsn_t lsn_avg_rate = 0;
/** Target oldest LSN for the requested flush_sync */
static lsn_t buf_flush_sync_lsn = 0;
#ifdef UNIV_PFS_THREAD
mysql_pfs_key_t page_cleaner_thread_key;
#endif /* UNIV_PFS_THREAD */
/** Event to synchronise with the flushing. */
os_event_t buf_flush_event;
/** State for page cleaner array slot */
enum page_cleaner_state_t {
/** Not requested any yet.
Moved from FINISHED by the coordinator. */
PAGE_CLEANER_STATE_NONE = 0,
/** Requested but not started flushing.
Moved from NONE by the coordinator. */
PAGE_CLEANER_STATE_REQUESTED,
/** Flushing is on going.
Moved from REQUESTED by the worker. */
PAGE_CLEANER_STATE_FLUSHING,
/** Flushing was finished.
Moved from FLUSHING by the worker. */
PAGE_CLEANER_STATE_FINISHED
};
/** Page cleaner request state for each buffer pool instance */
struct page_cleaner_slot_t {
page_cleaner_state_t state; /*!< state of the request.
protected by page_cleaner_t::mutex
if the worker thread got the slot and
set to PAGE_CLEANER_STATE_FLUSHING,
n_flushed_lru and n_flushed_list can be
updated only by the worker thread */
/* This value is set during state==PAGE_CLEANER_STATE_NONE */
ulint n_pages_requested;
/*!< number of requested pages
for the slot */
/* These values are updated during state==PAGE_CLEANER_STATE_FLUSHING,
and commited with state==PAGE_CLEANER_STATE_FINISHED.
The consistency is protected by the 'state' */
ulint n_flushed_lru;
/*!< number of flushed pages
by LRU scan flushing */
ulint n_flushed_list;
/*!< number of flushed pages
by flush_list flushing */
bool succeeded_list;
/*!< true if flush_list flushing
succeeded. */
ulint flush_lru_time;
/*!< elapsed time for LRU flushing */
ulint flush_list_time;
/*!< elapsed time for flush_list
flushing */
ulint flush_lru_pass;
/*!< count to attempt LRU flushing */
ulint flush_list_pass;
/*!< count to attempt flush_list
flushing */
};
/** Page cleaner structure common for all threads */
struct page_cleaner_t {
ib_mutex_t mutex; /*!< mutex to protect whole of
page_cleaner_t struct and
page_cleaner_slot_t slots. */
os_event_t is_requested; /*!< event to activate worker
threads. */
os_event_t is_finished; /*!< event to signal that all
slots were finished. */
os_event_t is_started; /*!< event to signal that
thread is started/exiting */
volatile ulint n_workers; /*!< number of worker threads
in existence */
bool requested; /*!< true if requested pages
to flush */
lsn_t lsn_limit; /*!< upper limit of LSN to be
flushed */
ulint n_slots; /*!< total number of slots */
ulint n_slots_requested;
/*!< number of slots
in the state
PAGE_CLEANER_STATE_REQUESTED */
ulint n_slots_flushing;
/*!< number of slots
in the state
PAGE_CLEANER_STATE_FLUSHING */
ulint n_slots_finished;
/*!< number of slots
in the state
PAGE_CLEANER_STATE_FINISHED */
ulint flush_time; /*!< elapsed time to flush
requests for all slots */
ulint flush_pass; /*!< count to finish to flush
requests for all slots */
page_cleaner_slot_t slots[MAX_BUFFER_POOLS];
bool is_running; /*!< false if attempt
to shutdown */
#ifdef UNIV_DEBUG
ulint n_disabled_debug;
/*<! how many of pc threads
have been disabled */
#endif /* UNIV_DEBUG */
};
static page_cleaner_t page_cleaner;
#ifdef UNIV_DEBUG
my_bool innodb_page_cleaner_disabled_debug;
#endif /* UNIV_DEBUG */
/** If LRU list of a buf_pool is less than this size then LRU eviction
should not happen. This is because when we do LRU flushing we also put
the blocks on free list. If LRU list is very small then we can end up
in thrashing. */
#define BUF_LRU_MIN_LEN 256
/* @} */
/******************************************************************//**
Increases flush_list size in bytes with the page size in inline function */
static inline
void
incr_flush_list_size_in_bytes(
/*==========================*/
buf_block_t* block, /*!< in: control block */
buf_pool_t* buf_pool) /*!< in: buffer pool instance */
{
ut_ad(buf_flush_list_mutex_own(buf_pool));
buf_pool->stat.flush_list_bytes += block->page.size.physical();
ut_ad(buf_pool->stat.flush_list_bytes <= buf_pool->curr_pool_size);
}
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
/******************************************************************//**
Validates the flush list.
@return TRUE if ok */
static
ibool
buf_flush_validate_low(
/*===================*/
buf_pool_t* buf_pool); /*!< in: Buffer pool instance */
/******************************************************************//**
Validates the flush list some of the time.
@return TRUE if ok or the check was skipped */
static
ibool
buf_flush_validate_skip(
/*====================*/
buf_pool_t* buf_pool) /*!< in: Buffer pool instance */
{
/** Try buf_flush_validate_low() every this many times */
# define BUF_FLUSH_VALIDATE_SKIP 23
/** The buf_flush_validate_low() call skip counter.
Use a signed type because of the race condition below. */
static int buf_flush_validate_count = BUF_FLUSH_VALIDATE_SKIP;
/* There is a race condition below, but it does not matter,
because this call is only for heuristic purposes. We want to
reduce the call frequency of the costly buf_flush_validate_low()
check in debug builds. */
if (--buf_flush_validate_count > 0) {
return(TRUE);
}
buf_flush_validate_count = BUF_FLUSH_VALIDATE_SKIP;
return(buf_flush_validate_low(buf_pool));
}
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
/******************************************************************//**
Insert a block in the flush_rbt and returns a pointer to its
predecessor or NULL if no predecessor. The ordering is maintained
on the basis of the <oldest_modification, space, offset> key.
@return pointer to the predecessor or NULL if no predecessor. */
static
buf_page_t*
buf_flush_insert_in_flush_rbt(
/*==========================*/
buf_page_t* bpage) /*!< in: bpage to be inserted. */
{
const ib_rbt_node_t* c_node;
const ib_rbt_node_t* p_node;
buf_page_t* prev = NULL;
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(srv_shutdown_state != SRV_SHUTDOWN_FLUSH_PHASE);
ut_ad(buf_flush_list_mutex_own(buf_pool));
/* Insert this buffer into the rbt. */
c_node = rbt_insert(buf_pool->flush_rbt, &bpage, &bpage);
ut_a(c_node != NULL);
/* Get the predecessor. */
p_node = rbt_prev(buf_pool->flush_rbt, c_node);
if (p_node != NULL) {
buf_page_t** value;
value = rbt_value(buf_page_t*, p_node);
prev = *value;
ut_a(prev != NULL);
}
return(prev);
}
/*********************************************************//**
Delete a bpage from the flush_rbt. */
static
void
buf_flush_delete_from_flush_rbt(
/*============================*/
buf_page_t* bpage) /*!< in: bpage to be removed. */
{
#ifdef UNIV_DEBUG
ibool ret = FALSE;
#endif /* UNIV_DEBUG */
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(buf_flush_list_mutex_own(buf_pool));
#ifdef UNIV_DEBUG
ret =
#endif /* UNIV_DEBUG */
rbt_delete(buf_pool->flush_rbt, &bpage);
ut_ad(ret);
}
/*****************************************************************//**
Compare two modified blocks in the buffer pool. The key for comparison
is:
key = <oldest_modification, space, offset>
This comparison is used to maintian ordering of blocks in the
buf_pool->flush_rbt.
Note that for the purpose of flush_rbt, we only need to order blocks
on the oldest_modification. The other two fields are used to uniquely
identify the blocks.
@return < 0 if b2 < b1, 0 if b2 == b1, > 0 if b2 > b1 */
static
int
buf_flush_block_cmp(
/*================*/
const void* p1, /*!< in: block1 */
const void* p2) /*!< in: block2 */
{
int ret;
const buf_page_t* b1 = *(const buf_page_t**) p1;
const buf_page_t* b2 = *(const buf_page_t**) p2;
ut_ad(b1 != NULL);
ut_ad(b2 != NULL);
#ifdef UNIV_DEBUG
buf_pool_t* buf_pool = buf_pool_from_bpage(b1);
#endif /* UNIV_DEBUG */
ut_ad(buf_flush_list_mutex_own(buf_pool));
ut_ad(b1->in_flush_list);
ut_ad(b2->in_flush_list);
if (b2->oldest_modification > b1->oldest_modification) {
return(1);
} else if (b2->oldest_modification < b1->oldest_modification) {
return(-1);
}
/* If oldest_modification is same then decide on the space. */
ret = (int)(b2->id.space() - b1->id.space());
/* Or else decide ordering on the page number. */
return(ret ? ret : (int) (b2->id.page_no() - b1->id.page_no()));
}
/********************************************************************//**
Initialize the red-black tree to speed up insertions into the flush_list
during recovery process. Should be called at the start of recovery
process before any page has been read/written. */
void
buf_flush_init_flush_rbt(void)
/*==========================*/
{
ulint i;
for (i = 0; i < srv_buf_pool_instances; i++) {
buf_pool_t* buf_pool;
buf_pool = buf_pool_from_array(i);
buf_flush_list_mutex_enter(buf_pool);
ut_ad(buf_pool->flush_rbt == NULL);
/* Create red black tree for speedy insertions in flush list. */
buf_pool->flush_rbt = rbt_create(
sizeof(buf_page_t*), buf_flush_block_cmp);
buf_flush_list_mutex_exit(buf_pool);
}
}
/********************************************************************//**
Frees up the red-black tree. */
void
buf_flush_free_flush_rbt(void)
/*==========================*/
{
ulint i;
for (i = 0; i < srv_buf_pool_instances; i++) {
buf_pool_t* buf_pool;
buf_pool = buf_pool_from_array(i);
buf_flush_list_mutex_enter(buf_pool);
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
ut_a(buf_flush_validate_low(buf_pool));
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
rbt_free(buf_pool->flush_rbt);
buf_pool->flush_rbt = NULL;
buf_flush_list_mutex_exit(buf_pool);
}
}
/********************************************************************//**
Inserts a modified block into the flush list. */
void
buf_flush_insert_into_flush_list(
/*=============================*/
buf_pool_t* buf_pool, /*!< buffer pool instance */
buf_block_t* block, /*!< in/out: block which is modified */
lsn_t lsn) /*!< in: oldest modification */
{
ut_ad(!buf_pool_mutex_own(buf_pool));
ut_ad(log_flush_order_mutex_own());
ut_ad(buf_page_mutex_own(block));
buf_flush_list_mutex_enter(buf_pool);
ut_ad((UT_LIST_GET_FIRST(buf_pool->flush_list) == NULL)
|| (UT_LIST_GET_FIRST(buf_pool->flush_list)->oldest_modification
<= lsn));
/* If we are in the recovery then we need to update the flush
red-black tree as well. */
if (buf_pool->flush_rbt != NULL) {
buf_flush_list_mutex_exit(buf_pool);
buf_flush_insert_sorted_into_flush_list(buf_pool, block, lsn);
return;
}
ut_ad(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE);
ut_ad(!block->page.in_flush_list);
ut_d(block->page.in_flush_list = TRUE);
block->page.oldest_modification = lsn;
UT_LIST_ADD_FIRST(buf_pool->flush_list, &block->page);
incr_flush_list_size_in_bytes(block, buf_pool);
#ifdef UNIV_DEBUG_VALGRIND
void* p;
if (block->page.size.is_compressed()) {
p = block->page.zip.data;
} else {
p = block->frame;
}
UNIV_MEM_ASSERT_RW(p, block->page.size.physical());
#endif /* UNIV_DEBUG_VALGRIND */
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
ut_a(buf_flush_validate_skip(buf_pool));
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
buf_flush_list_mutex_exit(buf_pool);
}
/********************************************************************//**
Inserts a modified block into the flush list in the right sorted position.
This function is used by recovery, because there the modifications do not
necessarily come in the order of lsn's. */
void
buf_flush_insert_sorted_into_flush_list(
/*====================================*/
buf_pool_t* buf_pool, /*!< in: buffer pool instance */
buf_block_t* block, /*!< in/out: block which is modified */
lsn_t lsn) /*!< in: oldest modification */
{
buf_page_t* prev_b;
buf_page_t* b;
ut_ad(srv_shutdown_state != SRV_SHUTDOWN_FLUSH_PHASE);
ut_ad(!buf_pool_mutex_own(buf_pool));
ut_ad(log_flush_order_mutex_own());
ut_ad(buf_page_mutex_own(block));
ut_ad(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE);
buf_flush_list_mutex_enter(buf_pool);
/* The field in_LRU_list is protected by buf_pool->mutex, which
we are not holding. However, while a block is in the flush
list, it is dirty and cannot be discarded, not from the
page_hash or from the LRU list. At most, the uncompressed
page frame of a compressed block may be discarded or created
(copying the block->page to or from a buf_page_t that is
dynamically allocated from buf_buddy_alloc()). Because those
transitions hold block->mutex and the flush list mutex (via
buf_flush_relocate_on_flush_list()), there is no possibility
of a race condition in the assertions below. */
ut_ad(block->page.in_LRU_list);
ut_ad(block->page.in_page_hash);
/* buf_buddy_block_register() will take a block in the
BUF_BLOCK_MEMORY state, not a file page. */
ut_ad(!block->page.in_zip_hash);
ut_ad(!block->page.in_flush_list);
ut_d(block->page.in_flush_list = TRUE);
block->page.oldest_modification = lsn;
#ifdef UNIV_DEBUG_VALGRIND
void* p;
if (block->page.size.is_compressed()) {
p = block->page.zip.data;
} else {
p = block->frame;
}
UNIV_MEM_ASSERT_RW(p, block->page.size.physical());
#endif /* UNIV_DEBUG_VALGRIND */
prev_b = NULL;
/* For the most part when this function is called the flush_rbt
should not be NULL. In a very rare boundary case it is possible
that the flush_rbt has already been freed by the recovery thread
before the last page was hooked up in the flush_list by the
io-handler thread. In that case we'll just do a simple
linear search in the else block. */
if (buf_pool->flush_rbt != NULL) {
prev_b = buf_flush_insert_in_flush_rbt(&block->page);
} else {
b = UT_LIST_GET_FIRST(buf_pool->flush_list);
while (b != NULL && b->oldest_modification
> block->page.oldest_modification) {
ut_ad(b->in_flush_list);
prev_b = b;
b = UT_LIST_GET_NEXT(list, b);
}
}
if (prev_b == NULL) {
UT_LIST_ADD_FIRST(buf_pool->flush_list, &block->page);
} else {
UT_LIST_INSERT_AFTER(buf_pool->flush_list, prev_b, &block->page);
}
incr_flush_list_size_in_bytes(block, buf_pool);
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
ut_a(buf_flush_validate_low(buf_pool));
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
buf_flush_list_mutex_exit(buf_pool);
}
/********************************************************************//**
Returns TRUE if the file page block is immediately suitable for replacement,
i.e., the transition FILE_PAGE => NOT_USED allowed.
@return TRUE if can replace immediately */
ibool
buf_flush_ready_for_replace(
/*========================*/
buf_page_t* bpage) /*!< in: buffer control block, must be
buf_page_in_file(bpage) and in the LRU list */
{
#ifdef UNIV_DEBUG
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(buf_pool_mutex_own(buf_pool));
#endif /* UNIV_DEBUG */
ut_ad(mutex_own(buf_page_get_mutex(bpage)));
ut_ad(bpage->in_LRU_list);
if (buf_page_in_file(bpage)) {
return(bpage->oldest_modification == 0
&& bpage->buf_fix_count == 0
&& buf_page_get_io_fix(bpage) == BUF_IO_NONE);
}
ib::fatal() << "Buffer block " << bpage << " state " << bpage->state
<< " in the LRU list!";
return(FALSE);
}
/********************************************************************//**
Returns true if the block is modified and ready for flushing.
@return true if can flush immediately */
bool
buf_flush_ready_for_flush(
/*======================*/
buf_page_t* bpage, /*!< in: buffer control block, must be
buf_page_in_file(bpage) */
buf_flush_t flush_type)/*!< in: type of flush */
{
#ifdef UNIV_DEBUG
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(buf_pool_mutex_own(buf_pool));
#endif /* UNIV_DEBUG */
ut_a(buf_page_in_file(bpage));
ut_ad(mutex_own(buf_page_get_mutex(bpage)));
ut_ad(flush_type < BUF_FLUSH_N_TYPES);
if (bpage->oldest_modification == 0
|| buf_page_get_io_fix(bpage) != BUF_IO_NONE) {
return(false);
}
ut_ad(bpage->in_flush_list);
switch (flush_type) {
case BUF_FLUSH_LIST:
case BUF_FLUSH_LRU:
case BUF_FLUSH_SINGLE_PAGE:
return(true);
case BUF_FLUSH_N_TYPES:
break;
}
ut_error;
return(false);
}
/********************************************************************//**
Remove a block from the flush list of modified blocks. */
void
buf_flush_remove(
/*=============*/
buf_page_t* bpage) /*!< in: pointer to the block in question */
{
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
#if 0 // FIXME: Rate-limit the output. Move this to the page cleaner?
if (UNIV_UNLIKELY(srv_shutdown_state == SRV_SHUTDOWN_FLUSH_PHASE)) {
service_manager_extend_timeout(
INNODB_EXTEND_TIMEOUT_INTERVAL,
"Flush and remove page with tablespace id %u"
", Poolid " ULINTPF ", flush list length " ULINTPF,
bpage->space, buf_pool->instance_no,
UT_LIST_GET_LEN(buf_pool->flush_list));
}
#endif
ut_ad(buf_pool_mutex_own(buf_pool));
ut_ad(mutex_own(buf_page_get_mutex(bpage)));
ut_ad(bpage->in_flush_list);
buf_flush_list_mutex_enter(buf_pool);
/* Important that we adjust the hazard pointer before removing
the bpage from flush list. */
buf_pool->flush_hp.adjust(bpage);
switch (buf_page_get_state(bpage)) {
case BUF_BLOCK_POOL_WATCH:
case BUF_BLOCK_ZIP_PAGE:
/* Clean compressed pages should not be on the flush list */
case BUF_BLOCK_NOT_USED:
case BUF_BLOCK_READY_FOR_USE:
case BUF_BLOCK_MEMORY:
case BUF_BLOCK_REMOVE_HASH:
ut_error;
return;
case BUF_BLOCK_ZIP_DIRTY:
buf_page_set_state(bpage, BUF_BLOCK_ZIP_PAGE);
UT_LIST_REMOVE(buf_pool->flush_list, bpage);
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
buf_LRU_insert_zip_clean(bpage);
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
break;
case BUF_BLOCK_FILE_PAGE:
UT_LIST_REMOVE(buf_pool->flush_list, bpage);
break;
}
/* If the flush_rbt is active then delete from there as well. */
if (buf_pool->flush_rbt != NULL) {
buf_flush_delete_from_flush_rbt(bpage);
}
/* Must be done after we have removed it from the flush_rbt
because we assert on in_flush_list in comparison function. */
ut_d(bpage->in_flush_list = FALSE);
buf_pool->stat.flush_list_bytes -= bpage->size.physical();
bpage->oldest_modification = 0;
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
ut_a(buf_flush_validate_skip(buf_pool));
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
/* If there is an observer that want to know if the asynchronous
flushing was done then notify it. */
if (bpage->flush_observer != NULL) {
bpage->flush_observer->notify_remove(buf_pool, bpage);
bpage->flush_observer = NULL;
}
buf_flush_list_mutex_exit(buf_pool);
}
/*******************************************************************//**
Relocates a buffer control block on the flush_list.
Note that it is assumed that the contents of bpage have already been
copied to dpage.
IMPORTANT: When this function is called bpage and dpage are not
exact copies of each other. For example, they both will have different
::state. Also the ::list pointers in dpage may be stale. We need to
use the current list node (bpage) to do the list manipulation because
the list pointers could have changed between the time that we copied
the contents of bpage to the dpage and the flush list manipulation
below. */
void
buf_flush_relocate_on_flush_list(
/*=============================*/
buf_page_t* bpage, /*!< in/out: control block being moved */
buf_page_t* dpage) /*!< in/out: destination block */
{
buf_page_t* prev;
buf_page_t* prev_b = NULL;
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(buf_pool_mutex_own(buf_pool));
/* Must reside in the same buffer pool. */
ut_ad(buf_pool == buf_pool_from_bpage(dpage));
ut_ad(mutex_own(buf_page_get_mutex(bpage)));
buf_flush_list_mutex_enter(buf_pool);
/* FIXME: At this point we have both buf_pool and flush_list
mutexes. Theoretically removal of a block from flush list is
only covered by flush_list mutex but currently we do
have buf_pool mutex in buf_flush_remove() therefore this block
is guaranteed to be in the flush list. We need to check if
this will work without the assumption of block removing code
having the buf_pool mutex. */
ut_ad(bpage->in_flush_list);
ut_ad(dpage->in_flush_list);
/* If recovery is active we must swap the control blocks in
the flush_rbt as well. */
if (buf_pool->flush_rbt != NULL) {
buf_flush_delete_from_flush_rbt(bpage);
prev_b = buf_flush_insert_in_flush_rbt(dpage);
}
/* Important that we adjust the hazard pointer before removing
the bpage from the flush list. */
buf_pool->flush_hp.adjust(bpage);
/* Must be done after we have removed it from the flush_rbt
because we assert on in_flush_list in comparison function. */
ut_d(bpage->in_flush_list = FALSE);
prev = UT_LIST_GET_PREV(list, bpage);
UT_LIST_REMOVE(buf_pool->flush_list, bpage);
if (prev) {
ut_ad(prev->in_flush_list);
UT_LIST_INSERT_AFTER( buf_pool->flush_list, prev, dpage);
} else {
UT_LIST_ADD_FIRST(buf_pool->flush_list, dpage);
}
/* Just an extra check. Previous in flush_list
should be the same control block as in flush_rbt. */
ut_a(buf_pool->flush_rbt == NULL || prev_b == prev);
#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG
ut_a(buf_flush_validate_low(buf_pool));
#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */
buf_flush_list_mutex_exit(buf_pool);
}
/** Update the flush system data structures when a write is completed.
@param[in,out] bpage flushed page
@param[in] dblwr whether the doublewrite buffer was used */
void buf_flush_write_complete(buf_page_t* bpage, bool dblwr)
{
buf_flush_t flush_type;
buf_pool_t* buf_pool = buf_pool_from_bpage(bpage);
ut_ad(bpage);
buf_flush_remove(bpage);
flush_type = buf_page_get_flush_type(bpage);
buf_pool->n_flush[flush_type]--;
ut_ad(buf_pool->n_flush[flush_type] != ULINT_MAX);
ut_ad(buf_pool_mutex_own(buf_pool));
if (buf_pool->n_flush[flush_type] == 0
&& buf_pool->init_flush[flush_type] == FALSE) {
/* The running flush batch has ended */
os_event_set(buf_pool->no_flush[flush_type]);
}
if (dblwr) {
buf_dblwr_update(bpage, flush_type);
}
}
/** Calculate the checksum of a page from compressed table and update
the page.
@param[in,out] page page to update
@param[in] size compressed page size
@param[in] lsn LSN to stamp on the page */
void
buf_flush_update_zip_checksum(
buf_frame_t* page,
ulint size,
lsn_t lsn)
{
ut_a(size > 0);
const uint32_t checksum = page_zip_calc_checksum(
page, size,
static_cast<srv_checksum_algorithm_t>(srv_checksum_algorithm));
mach_write_to_8(page + FIL_PAGE_LSN, lsn);
mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM, checksum);
}
/** Initialize a page for writing to the tablespace.
@param[in] block buffer block; NULL if bypassing the buffer pool
@param[in,out] page page frame
@param[in,out] page_zip_ compressed page, or NULL if uncompressed
@param[in] newest_lsn newest modification LSN to the page */
void
buf_flush_init_for_writing(
const buf_block_t* block,
byte* page,
void* page_zip_,
lsn_t newest_lsn)
{
ut_ad(block == NULL || block->frame == page);
ut_ad(block == NULL || page_zip_ == NULL
|| &block->page.zip == page_zip_);
ut_ad(page);
if (page_zip_) {
page_zip_des_t* page_zip;
ulint size;
page_zip = static_cast<page_zip_des_t*>(page_zip_);
size = page_zip_get_size(page_zip);
ut_ad(size);
ut_ad(ut_is_2pow(size));
ut_ad(size <= UNIV_ZIP_SIZE_MAX);
switch (fil_page_get_type(page)) {
case FIL_PAGE_TYPE_ALLOCATED:
case FIL_PAGE_INODE:
case FIL_PAGE_IBUF_BITMAP:
case FIL_PAGE_TYPE_FSP_HDR:
case FIL_PAGE_TYPE_XDES:
/* These are essentially uncompressed pages. */
memcpy(page_zip->data, page, size);
/* fall through */
case FIL_PAGE_TYPE_ZBLOB:
case FIL_PAGE_TYPE_ZBLOB2:
case FIL_PAGE_INDEX:
case FIL_PAGE_RTREE:
buf_flush_update_zip_checksum(
page_zip->data, size, newest_lsn);
return;
}
ib::error() << "The compressed page to be written"
" seems corrupt:";
ut_print_buf(stderr, page, size);
fputs("\nInnoDB: Possibly older version of the page:", stderr);
ut_print_buf(stderr, page_zip->data, size);
putc('\n', stderr);
ut_error;
}
/* Write the newest modification lsn to the page header and trailer */
mach_write_to_8(page + FIL_PAGE_LSN, newest_lsn);
mach_write_to_8(page + srv_page_size - FIL_PAGE_END_LSN_OLD_CHKSUM,
newest_lsn);
if (block && srv_page_size == 16384) {
/* The page type could be garbage in old files
created before MySQL 5.5. Such files always
had a page size of 16 kilobytes. */
ulint page_type = fil_page_get_type(page);
ulint reset_type = page_type;
switch (block->page.id.page_no() % 16384) {
case 0:
reset_type = block->page.id.page_no() == 0
? FIL_PAGE_TYPE_FSP_HDR
: FIL_PAGE_TYPE_XDES;
break;
case 1:
reset_type = FIL_PAGE_IBUF_BITMAP;
break;
case FSP_TRX_SYS_PAGE_NO:
if (block->page.id.page_no()
== TRX_SYS_PAGE_NO
&& block->page.id.space()
== TRX_SYS_SPACE) {
reset_type = FIL_PAGE_TYPE_TRX_SYS;
break;
}
/* fall through */
default:
switch (page_type) {
case FIL_PAGE_INDEX:
case FIL_PAGE_TYPE_INSTANT:
case FIL_PAGE_RTREE:
case FIL_PAGE_UNDO_LOG:
case FIL_PAGE_INODE:
case FIL_PAGE_IBUF_FREE_LIST:
case FIL_PAGE_TYPE_ALLOCATED:
case FIL_PAGE_TYPE_SYS:
case FIL_PAGE_TYPE_TRX_SYS:
case FIL_PAGE_TYPE_BLOB:
case FIL_PAGE_TYPE_ZBLOB:
case FIL_PAGE_TYPE_ZBLOB2:
break;
case FIL_PAGE_TYPE_FSP_HDR:
case FIL_PAGE_TYPE_XDES:
case FIL_PAGE_IBUF_BITMAP:
/* These pages should have
predetermined page numbers
(see above). */
default:
reset_type = FIL_PAGE_TYPE_UNKNOWN;
break;
}
}
if (UNIV_UNLIKELY(page_type != reset_type)) {
ib::info()
<< "Resetting invalid page "
<< block->page.id << " type "
<< page_type << " to "
<< reset_type << " when flushing.";
fil_page_set_type(page, reset_type);
}
}
uint32_t checksum= 0;
switch (srv_checksum_algorithm_t(srv_checksum_algorithm)) {
case SRV_CHECKSUM_ALGORITHM_INNODB:
case SRV_CHECKSUM_ALGORITHM_STRICT_INNODB:
checksum = buf_calc_page_new_checksum(page);
mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM,
checksum);
/* With the InnoDB checksum, we overwrite the first 4 bytes of
the end lsn field to store the old formula checksum. Since it
depends also on the field FIL_PAGE_SPACE_OR_CHKSUM, it has to
be calculated after storing the new formula checksum. */
checksum = buf_calc_page_old_checksum(page);
break;
case SRV_CHECKSUM_ALGORITHM_CRC32:
case SRV_CHECKSUM_ALGORITHM_STRICT_CRC32:
/* In other cases we write the same checksum to both fields. */
checksum = buf_calc_page_crc32(page);
mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM,
checksum);
break;
case SRV_CHECKSUM_ALGORITHM_NONE:
case SRV_CHECKSUM_ALGORITHM_STRICT_NONE:
checksum = BUF_NO_CHECKSUM_MAGIC;
mach_write_to_4(page + FIL_PAGE_SPACE_OR_CHKSUM,
checksum);
break;
/* no default so the compiler will emit a warning if
new enum is added and not handled here */
}