uflow: drop unused timestamp field

tools/lib/uflow.py

@@ -49,7 +49,6 @@ program = """
 struct call_t {
     u64 depth;                  // first bit is direction (0 entry, 1 return)
     u64 pid;                    // (tgid << 32) + pid from bpf_get_current...
-    u64 timestamp;              // ns
     char clazz[80];
     char method[80];
 };
@@ -89,7 +88,6 @@ int NAME(struct pt_regs *ctx) {
     FILTER_METHOD
 
     data.pid = bpf_get_current_pid_tgid();
-    data.timestamp = bpf_ktime_get_ns();
     depth = entry.lookup_or_init(&data.pid, &zero);
     data.depth = DEPTH;
     UPDATE
@@ -183,7 +181,6 @@ class CallEvent(ct.Structure):
     _fields_ = [
         ("depth", ct.c_ulonglong),
         ("pid", ct.c_ulonglong),
-        ("timestamp", ct.c_ulonglong),
         ("clazz", ct.c_char * 80),
         ("method", ct.c_char * 80)
         ]