58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
// Copyright 2018 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 memory
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import (
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"runtime"
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"sync/atomic"
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"time"
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"github.com/pingcap/failpoint"
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)
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var stats atomic.Pointer[globalMstats]
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// ReadMemInterval controls the interval to read memory stats.
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const ReadMemInterval = 300 * time.Millisecond
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// ReadMemStats read the mem stats from runtime.ReadMemStats
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func ReadMemStats() (memStats *runtime.MemStats) {
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s := stats.Load()
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if s != nil {
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memStats = &s.m
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} else {
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memStats = ForceReadMemStats()
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}
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failpoint.Inject("ReadMemStats", func(val failpoint.Value) {
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injectedSize := val.(int)
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memStats.HeapInuse += uint64(injectedSize)
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})
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return
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}
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// ForceReadMemStats is to force read memory stats.
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func ForceReadMemStats() *runtime.MemStats {
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var g globalMstats
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g.ts = time.Now()
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runtime.ReadMemStats(&g.m)
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stats.Store(&g)
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return &g.m
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}
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type globalMstats struct {
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ts time.Time
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m runtime.MemStats
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}
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