Question

标记目标对象存活，确保不被 GC 提前回收。

package main

import (
	"runtime"
	"time"
)

func main() {
	d := make([]byte, 100<<20)

	for i := 0; i < 5; i++ {
		time.Sleep(time.Second)
		runtime.GC()
	}

	runtime.KeepAlive(&d)
}

/*

$ go build && GODEBUG=gctrace=1 ./test

gc 3 @2.006s 0%: ..., 100->100->100 MB, 200 MB goal, ..., 2 P (forced)
gc 4 @3.013s 0%: ..., 100->100->100 MB, 200 MB goal, ..., 2 P (forced)
gc 5 @4.019s 0%: ..., 100->100->100 MB, 200 MB goal, ..., 2 P (forced)

*/