1# Monitor the system for dropped packets and proudce a report of drop locations and counts 2 3import os 4import sys 5 6sys.path.append(os.environ['PERF_EXEC_PATH'] + \ 7 '/scripts/python/Perf-Trace-Util/lib/Perf/Trace') 8 9from perf_trace_context import * 10from Core import * 11from Util import * 12 13drop_log = {} 14kallsyms = [] 15 16def 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 30def 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 51def 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 60def trace_begin(): 61 print "Starting trace (Ctrl-C to dump results)" 62 63def 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 69def skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm, 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 76