ebpf初探，动态追踪golang程序

    文章内容基本上是 https://blog.pixielabs.ai/ebpf-function-tracing/post/ 内容的复刻，对细节进行了补充以及错误修正。这里不再介绍ebpf的概念，网上应该能搜到很多相关的资料，最后使用的ebpf前端工具是bcc:

https://github.com/iovisor/bcc

golang程序实现与分析

       先用golang实现一个简单的HTTP Server，代码如下：

package main

import (
	"fmt"
	"math/rand"
	"net/http"
)

//go:noinline
func computeE(iterations int64) float64 {
	out := float64(iterations) + 1.2
	return out
}

func main() {
	http.HandleFunc("/e", func(w http.ResponseWriter, r *http.Request) {
		// Parse iters argument from get request, use default if not available.
		// ... removed for brevity ...
		aa := rand.Intn(5)
		arg := int64(aa)
		w.Write([]byte(fmt.Sprintf("e = %0.4f\n", computeE(arg))))
	})

	http.ListenAndServe("0.0.0.0:5555", nil)
	// Start server...
}

&nbs