0689b3df39
The statistics of the polling system no longer match the implementation it measures. Modified the statistics to better represent the new system by calculating the number of epoll events each thread receives.
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file statistics.h - Lock-free statistics gathering
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 21/01/16 Markus Makela Initial implementation
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* 15/06/16 Martin Brampton Frequently used functions inlined
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* @endverbatim
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*/
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#include <maxscale/cdefs.h>
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#include <stdint.h>
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MXS_BEGIN_DECLS
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typedef void* ts_stats_t;
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/** Enum values for ts_stats_get */
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enum ts_stats_type
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{
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TS_STATS_MAX, /**< Maximum value */
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TS_STATS_MIX, /**< Minimum value */
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TS_STATS_SUM, /**< Sum of all value */
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TS_STATS_AVG /**< Average of all values */
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};
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/** stats_init should be called only once */
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void ts_stats_init();
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/** No-op for now */
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void ts_stats_end();
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ts_stats_t ts_stats_alloc();
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void ts_stats_free(ts_stats_t stats);
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/**
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* @brief Get statistics
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*
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* @param stats Statistics to read
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* @param type Type of statistics to get
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* @return Statistics value
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*
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* @see enum ts_stats_type
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*/
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int64_t ts_stats_get(ts_stats_t stats, enum ts_stats_type type);
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/**
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* @brief Increment thread statistics by one
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*
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* @param stats Statistics to add to
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* @param thread_id ID of thread
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*/
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static void inline
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ts_stats_increment(ts_stats_t stats, int thread_id)
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{
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((int64_t*)stats)[thread_id]++;
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}
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/**
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* @brief Assign a value to a statistics element
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*
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* This sets the value for the specified thread.
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*
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* @param stats Statistics to set
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* @param value Value to set to
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* @param thread_id ID of thread
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*/
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static void inline
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ts_stats_set(ts_stats_t stats, int value, int thread_id)
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{
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((int64_t*)stats)[thread_id] = value;
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}
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/**
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* @brief Assign the maximum value to a statistics element
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*
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* This sets the value for the specified thread if the current value is smaller.
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*
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* @param stats Statistics to set
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* @param value Value to set to
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* @param thread_id ID of thread
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*/
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static void inline
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ts_stats_set_max(ts_stats_t stats, int value, int thread_id)
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{
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int64_t *p = (int64_t*) stats;
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if (value > p[thread_id])
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{
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p[thread_id] = value;
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}
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}
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/**
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* @brief Assign the minimum value to a statistics element
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*
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* This sets the value for the specified thread if the current value is larger.
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*
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* @param stats Statistics to set
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* @param value Value to set to
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* @param thread_id ID of thread
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*/
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static void inline
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ts_stats_set_min(ts_stats_t stats, int value, int thread_id)
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{
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int64_t *p = (int64_t*) stats;
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if (value < p[thread_id])
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{
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p[thread_id] = value;
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}
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}
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MXS_END_DECLS
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