# Monitor the system for dropped packets and proudce a report of drop locations and counts import osimport sys sys.path.append(os.environ['PERF_EXEC_PATH'] + \		'/scripts/python/Perf-Trace-Util/lib/Perf/Trace') from perf_trace_context import *from Core import *from Util import * drop_log = {}kallsyms = [] def get_kallsyms_table():	global kallsyms	try:		f = open("/proc/kallsyms", "r")		linecount = 0		for line in f:			linecount = linecount+1		f.seek(0)	except:		return  	j = 0	for line in f:		loc = int(line.split()[0], 16)		name = line.split()[2]		j = j +1		if ((j % 100) == 0):			print "\r" + str(j) + "/" + str(linecount),		kallsyms.append({ 'loc': loc, 'name' : name}) 	print "\r" + str(j) + "/" + str(linecount)	kallsyms.sort()	return def get_sym(sloc):	loc = int(sloc)	for i in kallsyms:		if (i['loc'] >= loc):			return (i['name'], i['loc']-loc)	return (None, 0) def print_drop_table():	print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")	for i in drop_log.keys():		(sym, off) = get_sym(i)		if sym == None:			sym = i		print "%25s %25s %25s" % (sym, off, drop_log[i])  def trace_begin():	print "Starting trace (Ctrl-C to dump results)" def trace_end():	print "Gathering kallsyms data"	get_kallsyms_table()	print_drop_table() # called from perf, when it finds a correspoinding eventdef skb__kfree_skb(name, context, cpu, sec, nsec, pid, comm,			skbaddr, protocol, location):	slocation = str(location)	try:		drop_log[slocation] = drop_log[slocation] + 1	except:		drop_log[slocation] = 1