kernel/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
  19         try:
  20                 f = open("/proc/kallsyms", "r")
  21         except:
  22                 return
  23
  24         for line in f:
  25                 loc = int(line.split()[0], 16)
  26                 name = line.split()[2]
  27                 kallsyms.append((loc, name))
  28         kallsyms.sort()
  29
  30 def get_sym(sloc):
  31         loc = int(sloc)
  32
  33         # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start
  34         #            kallsyms[i][0] > loc for all end <= i < len(kallsyms)
  35         start, end = -1, len(kallsyms)
  36         while end != start + 1:
  37                 pivot = (start + end) // 2
  38                 if loc < kallsyms[pivot][0]:
  39                         end = pivot
  40                 else:
  41                         start = pivot
  42
  43         # Now (start == -1 or kallsyms[start][0] <= loc)
  44         # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0])
  45         if start >= 0:
  46                 symloc, name = kallsyms[start]
  47                 return (name, loc - symloc)
  48         else:
  49                 return (None, 0)
  50
  51 def print_drop_table():
  52         print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
  53         for i in drop_log.keys():
  54                 (sym, off) = get_sym(i)
  55                 if sym == None:
  56                         sym = i
  57                 print "%25s %25s %25s" % (sym, off, drop_log[i])
  58
  59
  60 def trace_begin():
  61         print "Starting trace (Ctrl-C to dump results)"
  62
  63 def trace_end():
  64         print "Gathering kallsyms data"
  65         get_kallsyms_table()
  66         print_drop_table()
  67
  68 # called from perf, when it finds a correspoinding event
  69 def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain,
  70                    skbaddr, location, protocol):
  71         slocation = str(location)
  72         try:
  73                 drop_log[slocation] = drop_log[slocation] + 1
  74         except:
  75                 drop_log[slocation] = 1