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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package logger
import (
"fmt"
"runtime"
)
// RusagePrefixLog returns a Logf func wrapping the provided logf func that adds
// a prefixed log message to each line with the current binary memory usage
// and max RSS.
func RusagePrefixLog(logf Logf) Logf {
return func(f string, argv ...any) {
var m runtime.MemStats
runtime.ReadMemStats(&m)
goMem := float64(m.HeapInuse+m.StackInuse) / (1 << 20)
maxRSS := rusageMaxRSS()
pf := fmt.Sprintf("%.1fM/%.1fM %s", goMem, maxRSS, f)
logf(pf, argv...)
}
}
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