tools/dbus-latency.py

   1 #!/usr/bin/python
   2
   3 from bcc import BPF
   4 from time import sleep
   5 from ctypes import c_ushort, c_int, c_ulonglong
   6 from sys import argv
   7
   8 def usage():
   9         print("USAGE: %s [--process|histogram]" % argv[0])
  10         exit()
  11
  12 print("Hit Ctrl-C to end.")
  13 count = 100
  14 interval = 5
  15 loop = 0
  16
  17 mode = "histogram"
  18 if len(argv) != 2:
  19         usage()
  20 if argv[1] == "--histogram":
  21         mode = "histogram"
  22 elif argv[1] == "--process":
  23         mode = "process"
  24 else:
  25         usage()
  26
  27 b = BPF(src_file="dbus-latency.c")
  28
  29 b.attach_uprobe(name="dbus-1", sym="_dbus_connection_message_sent_unlocked", fn_name="get_msg_addr")
  30 b.attach_uprobe(name="dbus-1", sym="dbus_connection_dispatch", fn_name="get_msg_latency")
  31 b.attach_uprobe(name="gio-2.0", sym="g_dbus_message_lock", fn_name="g_get_latency")
  32
  33
  34 while (1):
  35         sleep(interval)
  36         loop = loop + 1
  37         print("\n%d:" % loop)
  38         if mode =="histogram":
  39                 b["latency_histo"].print_log2_hist("ms")
  40         else:
  41                 print ("%10s %20s %10s %10s %10s" % ("PID", "COMM", "MIN", "AVG", "MAX"))
  42                 latency = b["msg_latency"]
  43                 for v, p in sorted(latency.items(), key=lambda latency: latency[1].avg, reverse=True):
  44                         print("%10d %20s %10d %10d %10d" % (v.pid, v.comm.encode('string-escape'), int(p.min), int(p.avg), int(p.max)))
  45