tools/perf/scripts/python/net_dropmonitor.py

   1 # Monitor the system for dropped packets and proudce a report of drop locations and counts
   2
   3 import os
   4 import sys
   5
   6 sys.path.append(os.environ['PERF_EXEC_PATH'] + \
   7                 '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
   8
   9 from perf_trace_context import *
  10 from Core import *
  11 from Util import *
  12
  13 drop_log = {}
  14 kallsyms = []
  15
  16 def get_kallsyms_table():
  17         global kallsyms
  18         try:
  19                 f = open("/proc/kallsyms", "r")
  20                 linecount = 0
  21                 for line in f:
  22                         linecount = linecount+1
  23                 f.seek(0)
  24         except:
  25                 return
  26
  27
  28         j = 0
  29         for line in f:
  30                 loc = int(line.split()[0], 16)
  31                 name = line.split()[2]
  32                 j = j +1
  33                 if ((j % 100) == 0):
  34                         print "\r" + str(j) + "/" + str(linecount),
  35                 kallsyms.append((loc, name))
  36
  37         print "\r" + str(j) + "/" + str(linecount)
  38         kallsyms.sort()
  39         return
  40
  41 def get_sym(sloc):
  42         loc = int(sloc)
  43         for symloc, name in kallsyms[::-1]:
  44                 if loc >= symloc:
  45                         return (name, loc - symloc)
  46         return (None, 0)
  47
  48 def print_drop_table():
  49         print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
  50         for i in drop_log.keys():
  51                 (sym, off) = get_sym(i)
  52                 if sym == None:
  53                         sym = i
  54                 print "%25s %25s %25s" % (sym, off, drop_log[i])
  55
  56
  57 def trace_begin():
  58         print "Starting trace (Ctrl-C to dump results)"
  59
  60 def trace_end():
  61         print "Gathering kallsyms data"
  62         get_kallsyms_table()
  63         print_drop_table()
  64
  65 # called from perf, when it finds a correspoinding event
  66 def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm,
  67                    skbaddr, location, protocol):
  68         slocation = str(location)
  69         try:
  70                 drop_log[slocation] = drop_log[slocation] + 1
  71         except:
  72                 drop_log[slocation] = 1