743a1b1037
The polling statistics collection used atomic_add to increment values. This is not an optimal way to update statistical values. Moved to per thread values which are summed up when they are read. Moved the functions used to gather polling statistics to their own file and created a specific data type for statistics.
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
/*
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* This file is distributed as part of the MariaDB Corporation MaxScale. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright MariaDB Corporation Ab 2016
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*/
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#include <statistics.h>
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#include <maxconfig.h>
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#include <string.h>
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#include <platform.h>
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thread_local int current_thread_id = 0;
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static int thread_count = 0;
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static bool initialized = false;
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/**
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* Initialize the statistics gathering
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*/
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void ts_stats_init()
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{
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ss_dassert(!initialized);
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thread_count = config_threadcount();
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initialized = true;
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}
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/**
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* End the statistics gathering
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*/
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void ts_stats_end()
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{
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ss_dassert(initialized);
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}
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/**
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* Create a new statistics object
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*
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* @return New stats_t object or NULL if memory allocation failed
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*/
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ts_stats_t ts_stats_alloc()
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{
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ss_dassert(initialized);
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return calloc(thread_count, sizeof(int));
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}
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/**
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* Free a statistics object
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*
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* @param stats Stats to free
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*/
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void ts_stats_free(ts_stats_t stats)
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{
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ss_dassert(initialized);
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free(stats);
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}
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/**
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* Set the current thread id
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*
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* This should only be called only once by each thread.
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* @param id Thread id
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*/
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void ts_stats_set_thread_id(int id)
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{
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ss_dassert(initialized);
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current_thread_id = id;
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}
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/**
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* Add @c value to @c stats
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*
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* @param stats Statistics to add to
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* @param value Value to add
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*/
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void ts_stats_add(ts_stats_t stats, int value)
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{
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ss_dassert(initialized);
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((int*)stats)[current_thread_id] += value;
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}
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/**
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* Assign a value to the statistics
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*
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* This sets the value for the current thread only.
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* @param stats Statistics to set
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* @param value Value to set to
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*/
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void ts_stats_set(ts_stats_t stats, int value)
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{
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ss_dassert(initialized);
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((int*)stats)[current_thread_id] = value;
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}
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/**
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* Read the total value of the statistics object
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*
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* @param stats Statistics to read
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* @return Value of statistics
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*/
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int ts_stats_sum(ts_stats_t stats)
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{
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ss_dassert(initialized);
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int sum = 0;
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for (int i = 0; i < thread_count; i++)
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{
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sum += ((int*)stats)[i];
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}
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return sum;
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}
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