tcp_重新传输_skb的kprobe。我不希望tcp_重新传输_skb@tcp_states,而是希望kprobe_napi_时间表
在《BPF性能工具》一书中,有一个tcp_retransmit_skb的kprobe实现。我想做同样的事情,但不是tcp_retransmit_skb@tcp_states,我想kprobe_napi_schedule并取消枚举napi_STATE*的include/linux/netdevice.h。以下是我对上述内容的实施:tcp_重新传输_skb的kprobe。我不希望tcp_重新传输_skb@tcp_states,而是希望kprobe_napi_时间表,tcp,bpf,ebpf,kprobe,bcc-bpf,Tcp,Bpf,Ebpf,Kprobe,Bcc Bpf,在《BPF性能工具》一书中,有一个tcp_retransmit_skb的kprobe实现。我想做同样的事情,但不是tcp_retransmit_skb@tcp_states,我想kprobe_napi_schedule并取消枚举napi_STATE*的include/linux/netdevice.h。以下是我对上述内容的实施: 1 #!/usr/local/bin/bpftrace 2 3 #include <linux/netdevice.h> 4 5 kpro
1 #!/usr/local/bin/bpftrace
2
3 #include <linux/netdevice.h>
4
5 kprobe:__napi_schedule
6 {
7 $ns = (struct napi_struct *)arg0;
8
9 // Poll is scheduled
10 @napi[1] = "NAPI_STATE_SCHED";
11 @napi[2] = "NAPI_STATE_DISABLE";
12 @napi[3] = "NAPI_STATE_NPSVC";
13 @napi[4] = "NAPI_STATE_HASHED";
14 @napi[5] = "NAPI_STATE_NO_BUSY_POLL";
15
16
17 printf("-------------------\n");
18 printf("\n");
19 printf("__napi_schedule: %s pid: %d\n", comm, pid);
20 printf("\n");
21 $state = $ns->state;
22 printf("$ns->state: %d\n", $state);
23 $statestr = @napi[$state];
24 printf("state is: %s\n", $statestr);
25 clear(@napi);
26 printf("--------------------\n");
27 }
$ns->state
是位数组,所以值17实际上是(1)你能添加一个示例输出吗?printf
而不是显示的状态是…
吗?好的。我已经在上面的代码中添加了输出。你怎么发现它是NAPI_状态| MISSED | NAPI_状态(NO)BUSY(BUSY)POLL?我只给出$ns->状态是17。当你说“走位”时,你的意思是我应该使用移位操作(>)?我在代码中添加了这行“$state=$ns->state啊,很抱歉犯了一个错误。我已经更新了帖子。基本上,17是二进制的10001,映射到上面。
...
__napi_schedule: tmux: server pid: 9003
$ns->state: 17
state is:
--------------------
-------------------
__napi_schedule: tmux: server pid: 9003
$ns->state: 17
state is:
--------------------
-------------------
__napi_schedule: tmux: server pid: 9003
$ns->state: 17
state is:
--------------------
...