projects/linux·blob 0d55ec6f · refs

76 lines · 1.7 KiB

1# Monitor the system for dropped packets and proudce a report of drop locations and counts
2# SPDX-License-Identifier: GPL-2.0
3
4import os
5import sys
6
7sys.path.append(os.environ['PERF_EXEC_PATH'] + \
8 '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
9
10from perf_trace_context import *
11from Core import *
12from Util import *
13
14drop_log = {}
15kallsyms = []
16
17def get_kallsyms_table():
18 global kallsyms
19
20 try:
21 f = open("/proc/kallsyms", "r")
22 except:
23 return
24
25 for line in f:
26 loc = int(line.split()[0], 16)
27 name = line.split()[2]
28 kallsyms.append((loc, name))
29 kallsyms.sort()
30
31def get_sym(sloc):
32 loc = int(sloc)
33
34 # Invariant: kallsyms[i][0] <= loc for all 0 <= i <= start
35 # kallsyms[i][0] > loc for all end <= i < len(kallsyms)
36 start, end = -1, len(kallsyms)
37 while end != start + 1:
38 pivot = (start + end) // 2
39 if loc < kallsyms[pivot][0]:
40 end = pivot
41 else:
42 start = pivot
43
44 # Now (start == -1 or kallsyms[start][0] <= loc)
45 # and (start == len(kallsyms) - 1 or loc < kallsyms[start + 1][0])
46 if start >= 0:
47 symloc, name = kallsyms[start]
48 return (name, loc - symloc)
49 else:
50 return (None, 0)
51
52def print_drop_table():
53 print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
54 for i in drop_log.keys():
55 (sym, off) = get_sym(i)
56 if sym == None:
57 sym = i
58 print "%25s %25s %25s" % (sym, off, drop_log[i])
59
60
61def trace_begin():
62 print "Starting trace (Ctrl-C to dump results)"
63
64def trace_end():
65 print "Gathering kallsyms data"
66 get_kallsyms_table()
67 print_drop_table()
68
69# called from perf, when it finds a correspoinding event
70def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, callchain,
71 skbaddr, location, protocol):
72 slocation = str(location)
73 try:
74 drop_log[slocation] = drop_log[slocation] + 1
75 except:
76 drop_log[slocation] = 1