54 lines
2.1 KiB
C++
54 lines
2.1 KiB
C++
/* Copyright (c) 2023, 2024, Oracle and/or its affiliates.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is designed to work with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have either included with
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the program or referenced in the documentation.
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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, version 2.0, 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
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef AGGREGATED_STATS_H
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#define AGGREGATED_STATS_H
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#include "aggregated_stats_buffer.h"
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#include "include/my_thread_local.h" // my_thread_id
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/**
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To facilitate calculating values of status variables aggregated per all THDs
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in real-time, each THD will update its stats into a matching buffer shard.
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Later we will aggregate the values accross all the shards to get the final
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values.
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This mechanism avoids possible contentions if all THDs would write directly
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to a single shared global buffer.
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*/
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struct aggregated_stats {
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constexpr static size_t STAT_SHARD_COUNT = 64;
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inline aggregated_stats_buffer &get_shard(my_thread_id thread_id) {
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const size_t shard_idx = thread_id % STAT_SHARD_COUNT;
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return shards_[shard_idx];
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}
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void flush();
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void get_total(aggregated_stats_buffer &result);
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uint64_t get_single_total(size_t offset);
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protected:
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aggregated_stats_buffer shards_[STAT_SHARD_COUNT];
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};
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#endif /* AGGREGATES_STATS_H */
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