MySQL 8.4.0
Source Code Documentation
pfs_histogram.h
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1/* Copyright (c) 2016, 2024, Oracle and/or its affiliates.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License, version 2.0,
5 as published by the Free Software Foundation.
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7 This program is designed to work with certain software (including
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9 as designated in a particular file or component or in included license
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12 separately licensed software that they have either included with
13 the program or referenced in the documentation.
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15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
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20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
23
24#ifndef PFS_HISTOGRAM_H
25#define PFS_HISTOGRAM_H
26
27#include <atomic>
28#include "my_compiler.h"
29#include "my_inttypes.h"
30
31/**
32 @file storage/perfschema/pfs_histogram.h
33*/
34
35/** Number of buckets used in histograms. */
36#define NUMBER_OF_BUCKETS 450
37
39 public:
40 void reset();
41
42 void increment_bucket(uint bucket_index) { m_bucket[bucket_index]++; }
43
44 ulonglong read_bucket(uint bucket_index) { return m_bucket[bucket_index]; }
45
46 private:
47 std::atomic<ulonglong> m_bucket[NUMBER_OF_BUCKETS];
48};
49
52
53 void init();
54};
55
57
58#endif
Header for compiler-dependent features.
Some integer typedefs for easier portability.
unsigned long long int ulonglong
Definition: my_inttypes.h:56
struct PFS_histogram_timers g_histogram_pico_timers
Timer values used in histograms.
Definition: pfs_histogram.cc:58
#define NUMBER_OF_BUCKETS
Number of buckets used in histograms.
Definition: pfs_histogram.h:36
Definition: pfs_histogram.h:50
void init()
Definition: pfs_histogram.cc:68
ulonglong m_bucket_timer[NUMBER_OF_BUCKETS+1]
Definition: pfs_histogram.h:51
Definition: pfs_histogram.h:38
std::atomic< ulonglong > m_bucket[NUMBER_OF_BUCKETS]
Definition: pfs_histogram.h:47
ulonglong read_bucket(uint bucket_index)
Definition: pfs_histogram.h:44
void reset()
Definition: pfs_histogram.cc:60
void increment_bucket(uint bucket_index)
Definition: pfs_histogram.h:42