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70c1110a29
Performance schema likely/unlikely assume that performance schema is enabled by default, which causes a performance degradation for default installations that doesn't have performance schema enabled. Fixed by changing the likely/unlikely in PS to assume it's not enabled. This can be changed by compiling with -DPSI_ON_BY_DEFAULT Other changes: - Added psi_likely/psi_unlikely that is depending on PSI_ON_BY_DEFAULT. psi_likely() is assumed to be true if PS is enabled. - Added likely/unlikely to some PS interface code. - Moved pfs_enabled to mysys (was initialized but not used before) - Added "if (pfs_likely(pfs_enabled))" around calls to PS to avoid an extra call if PS is not enabled. - Moved checking flag_global_instrumention before other flags to speed up the case when PS is not enabled.
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
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Copyright (c) 2017, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
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#ifndef MYSQL_IDLE_H
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#define MYSQL_IDLE_H
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/**
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@file mysql/psi/mysql_idle.h
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Instrumentation helpers for idle waits.
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*/
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#include "mysql/psi/psi.h"
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/**
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@defgroup Idle_instrumentation Idle Instrumentation
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@ingroup Instrumentation_interface
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@{
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*/
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/**
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@def MYSQL_START_IDLE_WAIT
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Instrumentation helper for table io_waits.
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This instrumentation marks the start of a wait event.
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@param LOCKER the locker
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@param STATE the locker state
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@sa MYSQL_END_IDLE_WAIT.
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*/
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#ifdef HAVE_PSI_IDLE_INTERFACE
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#define MYSQL_START_IDLE_WAIT(LOCKER, STATE) \
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LOCKER= inline_mysql_start_idle_wait(STATE, __FILE__, __LINE__)
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#else
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#define MYSQL_START_IDLE_WAIT(LOCKER, STATE) \
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do {} while (0)
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#endif
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/**
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@def MYSQL_END_IDLE_WAIT
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Instrumentation helper for idle waits.
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This instrumentation marks the end of a wait event.
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@param LOCKER the locker
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@sa MYSQL_START_IDLE_WAIT.
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*/
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#ifdef HAVE_PSI_IDLE_INTERFACE
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#define MYSQL_END_IDLE_WAIT(LOCKER) \
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inline_mysql_end_idle_wait(LOCKER)
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#else
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#define MYSQL_END_IDLE_WAIT(LOCKER) \
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do {} while (0)
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#endif
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#ifdef HAVE_PSI_IDLE_INTERFACE
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/**
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Instrumentation calls for MYSQL_START_IDLE_WAIT.
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@sa MYSQL_END_IDLE_WAIT.
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*/
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static inline struct PSI_idle_locker *
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inline_mysql_start_idle_wait(PSI_idle_locker_state *state,
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const char *src_file, uint src_line)
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{
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struct PSI_idle_locker *locker;
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locker= PSI_IDLE_CALL(start_idle_wait)(state, src_file, src_line);
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return locker;
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}
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/**
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Instrumentation calls for MYSQL_END_IDLE_WAIT.
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@sa MYSQL_START_IDLE_WAIT.
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*/
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static inline void
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inline_mysql_end_idle_wait(struct PSI_idle_locker *locker)
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{
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if (psi_likely(locker != NULL))
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PSI_IDLE_CALL(end_idle_wait)(locker);
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}
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#endif
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/** @} (end of group Idle_instrumentation) */
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#endif
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