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86 lines
2.4 KiB
86 lines
2.4 KiB
8 years ago
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// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package perfschema
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import (
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"fmt"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/util/types"
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)
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// EnumCallerName is used as a parameter to avoid calling runtime.Caller(1) since
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// it is too expensive (500ns+ per call), we don't want to invoke it repeatedly for
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// each instrument.
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type EnumCallerName int
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const (
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// CallerNameSessionExecute is for session.go:Execute() method.
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CallerNameSessionExecute EnumCallerName = iota + 1
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)
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const (
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stageInstrumentPrefix = "stage/"
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statementInstrumentPrefix = "statement/"
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transactionInstrumentPrefix = "transaction"
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)
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// Flag indicators for table setup_timers.
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const (
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flagStage = iota + 1
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flagStatement
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flagTransaction
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)
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type enumTimerName int
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// Enum values for the TIMER_NAME columns.
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// This enum is found in the following tables:
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// - performance_schema.setup_timer (TIMER_NAME)
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const (
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timerNameNone enumTimerName = iota
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timerNameNanosec
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timerNameMicrosec
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timerNameMillisec
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)
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var (
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callerNames = make(map[EnumCallerName]string)
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)
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// addInstrument is used to add an item to setup_instruments table.
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func (ps *perfSchema) addInstrument(name string) (uint64, error) {
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record := types.MakeDatums(name, mysql.Enum{Name: "YES", Value: 1}, mysql.Enum{Name: "YES", Value: 1})
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tbl := ps.mTables[TableSetupInstruments]
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handle, err := tbl.AddRecord(nil, record)
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return uint64(handle), errors.Trace(err)
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}
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func (ps *perfSchema) getTimerName(flag int) (enumTimerName, error) {
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if flag < 0 || flag >= len(setupTimersRecords) {
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return timerNameNone, errors.Errorf("Unknown timerName flag %d", flag)
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}
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timerName := fmt.Sprintf("%s", setupTimersRecords[flag][1].GetString())
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switch timerName {
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case "NANOSECOND":
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return timerNameNanosec, nil
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case "MICROSECOND":
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return timerNameMicrosec, nil
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case "MILLISECOND":
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return timerNameMillisec, nil
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}
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return timerNameNone, nil
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}
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