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/* Copyright (c) 2008, 2010, 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,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
/**
@file storage/perfschema/pfs_events_waits.cc
Events waits data structures (implementation).
*/
#include "my_global.h"
#include "my_sys.h"
#include "pfs_global.h"
#include "pfs_instr.h"
#include "pfs_events_waits.h"
#include "pfs_atomic.h"
#include "m_string.h"
ulong events_waits_history_long_size= 0;
/** Consumer flag for table EVENTS_WAITS_CURRENT. */
bool flag_events_waits_current= true;
/** Consumer flag for table EVENTS_WAITS_HISTORY. */
bool flag_events_waits_history= true;
/** Consumer flag for table EVENTS_WAITS_HISTORY_LONG. */
bool flag_events_waits_history_long= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_THREAD_BY_EVENT_NAME. */
bool flag_events_waits_summary_by_thread_by_event_name= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_EVENT_NAME. */
bool flag_events_waits_summary_by_event_name= true;
/** Consumer flag for table EVENTS_WAITS_SUMMARY_BY_INSTANCE. */
bool flag_events_waits_summary_by_instance= true;
bool flag_events_locks_summary_by_event_name= true;
bool flag_events_locks_summary_by_instance= true;
/** Consumer flag for table FILE_SUMMARY_BY_EVENT_NAME. */
bool flag_file_summary_by_event_name= true;
/** Consumer flag for table FILE_SUMMARY_BY_INSTANCE. */
bool flag_file_summary_by_instance= true;
/** True if EVENTS_WAITS_HISTORY_LONG circular buffer is full. */
bool events_waits_history_long_full= false;
/** Index in EVENTS_WAITS_HISTORY_LONG circular buffer. */
volatile uint32 events_waits_history_long_index= 0;
/** EVENTS_WAITS_HISTORY_LONG circular buffer. */
PFS_events_waits *events_waits_history_long_array= NULL;
/**
Initialize table EVENTS_WAITS_HISTORY_LONG.
@param events_waits_history_long_sizing table sizing
*/
int init_events_waits_history_long(uint events_waits_history_long_sizing)
{
events_waits_history_long_size= events_waits_history_long_sizing;
events_waits_history_long_full= false;
PFS_atomic::store_u32(&events_waits_history_long_index, 0);
if (events_waits_history_long_size == 0)
return 0;
events_waits_history_long_array=
PFS_MALLOC_ARRAY(events_waits_history_long_size, PFS_events_waits,
MYF(MY_ZEROFILL));
return (events_waits_history_long_array ? 0 : 1);
}
/** Cleanup table EVENTS_WAITS_HISTORY_LONG. */
void cleanup_events_waits_history_long(void)
{
pfs_free(events_waits_history_long_array);
events_waits_history_long_array= NULL;
}
static void copy_events_waits(PFS_events_waits *dest,
const PFS_events_waits *source)
{
/* m_wait_class must be the first member of PFS_events_waits. */
compile_time_assert(offsetof(PFS_events_waits, m_wait_class) == 0);
char* dest_body= (reinterpret_cast<char*> (dest)) + sizeof(events_waits_class);
const char* source_body= (reinterpret_cast<const char*> (source))
+ sizeof(events_waits_class);
/* See comments in table_events_waits_common::make_row(). */
/* Signal readers they are about to read garbage ... */
dest->m_wait_class= NO_WAIT_CLASS;
/* ... that this can generate. */
memcpy_fixed(dest_body,
source_body,
sizeof(PFS_events_waits) - sizeof(events_waits_class));
/* Signal readers the record is now clean again. */
dest->m_wait_class= source->m_wait_class;
}
/**
Insert a wait record in table EVENTS_WAITS_HISTORY.
@param thread thread that executed the wait
@param wait record to insert
*/
void insert_events_waits_history(PFS_thread *thread, PFS_events_waits *wait)
{
uint index= thread->m_waits_history_index;
/*
A concurrent thread executing TRUNCATE TABLE EVENTS_WAITS_CURRENT
could alter the data that this thread is inserting,
causing a potential race condition.
We are not testing for this and insert a possibly empty record,
to make this thread (the writer) faster.
This is ok, the truncated data will have
wait->m_wait_class == NO_WAIT_CLASS,
which readers of m_waits_history will filter out.
*/
copy_events_waits(&thread->m_waits_history[index], wait);
index++;
if (index >= events_waits_history_per_thread)
{
index= 0;
thread->m_waits_history_full= true;
}
thread->m_waits_history_index= index;
}
/**
Insert a wait record in table EVENTS_WAITS_HISTORY_LONG.
@param wait record to insert
*/
void insert_events_waits_history_long(PFS_events_waits *wait)
{
uint index= PFS_atomic::add_u32(&events_waits_history_long_index, 1);
index= index % events_waits_history_long_size;
if (index == 0)
events_waits_history_long_full= true;
/* See related comment in insert_events_waits_history. */
copy_events_waits(&events_waits_history_long_array[index], wait);
}
/** Reset table EVENTS_WAITS_CURRENT data. */
void reset_events_waits_current(void)
{
PFS_thread *pfs_thread= thread_array;
PFS_thread *pfs_thread_last= thread_array + thread_max;
for ( ; pfs_thread < pfs_thread_last; pfs_thread++)
{
PFS_wait_locker *locker= pfs_thread->m_wait_locker_stack;
PFS_wait_locker *locker_last= locker + LOCKER_STACK_SIZE;
for ( ; locker < locker_last; locker++)
locker->m_waits_current.m_wait_class= NO_WAIT_CLASS;
}
}
/** Reset table EVENTS_WAITS_HISTORY data. */
void reset_events_waits_history(void)
{
PFS_thread *pfs_thread= thread_array;
PFS_thread *pfs_thread_last= thread_array + thread_max;
for ( ; pfs_thread < pfs_thread_last; pfs_thread++)
{
PFS_events_waits *wait= pfs_thread->m_waits_history;
PFS_events_waits *wait_last= wait + events_waits_history_per_thread;
pfs_thread->m_waits_history_index= 0;
pfs_thread->m_waits_history_full= false;
for ( ; wait < wait_last; wait++)
wait->m_wait_class= NO_WAIT_CLASS;
}
}
/** Reset table EVENTS_WAITS_HISTORY_LONG data. */
void reset_events_waits_history_long(void)
{
PFS_atomic::store_u32(&events_waits_history_long_index, 0);
events_waits_history_long_full= false;
PFS_events_waits *wait= events_waits_history_long_array;
PFS_events_waits *wait_last= wait + events_waits_history_long_size;
for ( ; wait < wait_last; wait++)
wait->m_wait_class= NO_WAIT_CLASS;
}
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