ネットワークインターフェイス名（eg：eth2）に基づいてtrace-cmdレポートを取得する方法は？

Question

ネットワークインターフェイス名（eg：eth1またはeth2）に基づいてtrace-cmdレポートをフィルタリングする方法はありますか。
trace-cmdレポートフィルタでEVENT_FIELDとして「名前」を使用しようとすると、何も得られません。 netif_receive_skb

name: netif_receive_skb 
ID: 991 
format: 
     field:unsigned short common_type;  offset:0;  size:2; signed:0; 
     field:unsigned char common_flags;  offset:2;  size:1; signed:0; 
     field:unsigned char common_preempt_count;  offset:3;  size:1; signed:0; 
     field:int common_pid; offset:4;  size:4; signed:1; 

     field:void * skbaddr; offset:8;  size:8; signed:0; 
     field:unsigned int len; offset:16;  size:4; signed:0; 
     field:__data_loc char[] name; offset:20;  size:4; signed:1; 

print fmt: "dev=%s skbaddr=%p len=%u", __get_str(name), REC->skbaddr, REC->len 

そして中のイベントフォーマットされ
後 は私が

[prap4test]$trace-cmd report -F 'net/netif_receive_skb:name=="eth1"' 
    version = 6 
    cpus=2 
    [prap4test]$ 

を使用するコマンドですが、私はEVENT_FIELD

[prap4test]$trace-cmd report -F 'net/netif_receive_skb' 
version = 6 
cpus=2 
     trace-cmd-19979 [000] 499726.602505: netif_receive_skb: dev=eth2 skbaddr=0xffff8800e9bb0e00 len=84 
      sshd-21184 [000] 499726.603209: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e9bb0f00 len=52 
     trace-cmd-19978 [000] 499727.809932: netif_receive_skb: dev=eth2 skbaddr=0xffff8800e9bb5000 len=46 
     trace-cmd-19979 [001] 499728.105372: netif_receive_skb: dev=eth2 skbaddr=0xffff8800e753cc00 len=328 
     trace-cmd-19978 [000] 499728.780571: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e9bb0700 len=100 
[prap4test]$trace-cmd report -F 'net/netif_receive_skb:len >= 50' 
version = 6 
cpus=2 
     trace-cmd-19979 [000] 499726.602505: netif_receive_skb: dev=eth2 skbaddr=0xffff8800e9bb0e00 len=84 
      sshd-21184 [000] 499726.603209: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e9bb0f00 len=52 
     trace-cmd-19979 [001] 499728.105372: netif_receive_skb: dev=eth2 skbaddr=0xffff8800e753cc00 len=328 
     trace-cmd-19978 [000] 499728.780571: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e9bb0700 len=100 

次のように "LEN" を使用することができましたtrace-cmd-report私は以下の詳細を見つけました

Note, the EVENT_FIELD is the field name as shown by an events format 
(as displayed with *--events*), and not what is found in the output. 
If the output shows "ID:foo" but the field that "foo" belongs to was 
called "name" in the event format, then "name" must be used in the filter. 
The same is true about values. If the value that is displayed is converted 
by to a string symbol, the filter checks the original value and not the 
value displayed. For example, to filter on all tasks that were in the 
running state at a context switch: 

    -F 'sched/sched_switch : prev_state==0' 

Although the output displays 'R', having 'prev_stat=="R"' will not work. 

だから要するに、私はこれが実際にトレース-CMDのバグである「名前」EVENT_FIELDに基づいて事前に

おかげで、
prap4search

Answer 1

をフィルタリングするためのコマンドを知ってほしいです。
私はSteven Rostedt（trace-cmdの作成者）の次のパッチを修正しました。

diff --git a/parse-filter.c b/parse-filter.c 
index c2fd26f..8e302c4 100644 
--- a/parse-filter.c 
+++ b/parse-filter.c 
@@ -1880,17 +1880,25 @@ static const char *get_field_str(struct filter_arg *arg, struct pevent_record *r 
    struct pevent *pevent; 
    unsigned long long addr; 
    const char *val = NULL; 
+ unsigned int size; 
    char hex[64]; 

    /* If the field is not a string convert it */ 
    if (arg->str.field->flags & FIELD_IS_STRING) { 
     val = record->data + arg->str.field->offset; 
+  size = arg->str.field->size; 
+ 
+  if (arg->str.field->flags & FIELD_IS_DYNAMIC) { 
+   addr = *(unsigned int *)val; 
+   val = record->data + (addr & 0xffff); 
+   size = addr >> 16; 
+  } 

     /* 
     * We need to copy the data since we can't be sure the field 
     * is null terminated. 
     */ 
-  if (*(val + arg->str.field->size - 1)) { 
+  if (*(val + size - 1)) { 
      /* copy it */ 
      memcpy(arg->str.buffer, val, arg->str.field->size); 
      /* the buffer is already NULL terminated */ 

私はインターフェイス名

[prap4test]$../trace-cmd/trace-cmd report -F 'net/netif_receive_skb:name=="eth1"' 
cpus=2 
     trace-cmd-1108 [000] 1111798.397704: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e9f5ee00 len=52 
     trace-cmd-1108 [000] 1111798.428998: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e867b400 len=392 
     trace-cmd-1108 [000] 1111798.989447: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e743ed00 len=46 
     trace-cmd-1108 [000] 1111799.450838: netif_receive_skb: dev=eth1 skbaddr=0xffff8800eab94b00 len=576 
     trace-cmd-1108 [000] 1111799.549737: netif_receive_skb: dev=eth1 skbaddr=0xffff8800eab94700 len=576 
     trace-cmd-1108 [000] 1111800.263439: netif_receive_skb: dev=eth1 skbaddr=0xffff8800e87c4e00 len=100 

を使用してフィルタリングすることができるパッチを適用した後、