基于ebpf的性能工具-bpftrace

youyeetoo@youyeetoo:~$ sudo apt-get install -y bpftrace

youyeetoo@youyeetoo:~$ bpftrace -V
bpftrace v0.14.0

## 列出ebpf支持的探针指令：
$ bpftrace -l

## 查看ebpf支持的探针个数：
$ bpftrace -l  | wc -l

## 查看不同类型ebpf探针个数：
$ bpftrace -l  | awk -F ":" '{print $1}' | sort | uniq -c

# Files opened by process
$ bpftrace -e 'tracepoint:syscalls:sys_enter_open { printf("%s %s\n", comm, str(args->filename)); }'

# Syscall count by program
$ bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @[comm] = count(); }'

# Read bytes by process:
$ bpftrace -e 'tracepoint:syscalls:sys_exit_read /args->ret/ { @[comm] = sum(args->ret); }'

# Read size distribution by process:
$ bpftrace -e 'tracepoint:syscalls:sys_exit_read { @[comm] = hist(args->ret); }'

# Show per-second syscall rates:
$ bpftrace -e 'tracepoint:raw_syscalls:sys_enter { @ = count(); } interval:s:1 { print(@); clear(@); }'

# Trace disk size by process
$ bpftrace -e 'tracepoint:block:block_rq_issue { printf("%d %s %d\n", pid, comm, args->bytes); }'

# Count page faults by process
$ bpftrace -e 'software:faults:1 { @[comm] = count(); }'

# Count LLC cache misses by process name and PID (uses PMCs):
$ bpftrace -e 'hardware:cache-misses:1000000 { @[comm, pid] = count(); }'

# Profile user-level stacks at 99 Hertz, for PID 189:
$ bpftrace -e 'profile:hz:99 /pid == 189/ { @[ustack] = count(); }'

# Files opened, for processes in the root cgroup-v2
$ bpftrace -e 'tracepoint:syscalls:sys_enter_openat /cgroup == cgroupid("/sys/fs/cgroup/unified/mycg")/ { printf("%s\n", str(args->filename)); }'

BEGIN
{
        printf("Tracing bash commands... Hit Ctrl-C to end.\n");
        printf("%-9s\t%s\t%s\t%s\n", "TIME", "UID", "PID", "COMMAND");
}

uretprobe:/bin/bash:readline
{
        time("%H:%M:%S\t");
        printf("%d\t%d\t%s\n", uid, pid, str(retval));
}

END
{
        printf("end-test");
}