tools: power: pm-graph: AnalyzeBoot v2.0

First release into the kernel tools source
- pulls in analyze_suspend.py as as library, same html formatting
- supplants scripts/bootgraph.pl, outputs HTML instead of SVG
- enables automatic reboot and collection for easy timeline capture
- enables ftrace callgraph collection from early boot

Signed-off-by: Todd Brandt <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

tools/power/pm-graph/analyze_boot.py

···
+#!/usr/bin/python
+#
+# Tool for analyzing boot timing
+# Copyright (c) 2013, Intel Corporation.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# Authors:
+#	 Todd Brandt <[e-mail]>
+#
+# Description:
+#	 This tool is designed to assist kernel and OS developers in optimizing
+#	 their linux stack's boot time. It creates an html representation of
+#	 the kernel boot timeline up to the start of the init process.
+#
+
+# ----------------- LIBRARIES --------------------
+
+import sys
+import time
+import os
+import string
+import re
+import platform
+import shutil
+from datetime import datetime, timedelta
+from subprocess import call, Popen, PIPE
+import analyze_suspend as aslib
+
+# ----------------- CLASSES --------------------
+
+# Class: SystemValues
+# Description:
+#	 A global, single-instance container used to
+#	 store system values and test parameters
+class SystemValues(aslib.SystemValues):
+	title = 'BootGraph'
+	version = 2.0
+	hostname = 'localhost'
+	testtime = ''
+	kernel = ''
+	dmesgfile = ''
+	ftracefile = ''
+	htmlfile = 'bootgraph.html'
+	outfile = ''
+	phoronix = False
+	addlogs = False
+	useftrace = False
+	usedevsrc = True
+	suspendmode = 'boot'
+	max_graph_depth = 2
+	graph_filter = 'do_one_initcall'
+	reboot = False
+	manual = False
+	iscronjob = False
+	timeformat = '%.6f'
+	def __init__(self):
+		if('LOG_FILE' in os.environ and 'TEST_RESULTS_IDENTIFIER' in os.environ):
+			self.phoronix = True
+			self.addlogs = True
+			self.outfile = os.environ['LOG_FILE']
+			self.htmlfile = os.environ['LOG_FILE']
+		self.hostname = platform.node()
+		self.testtime = datetime.now().strftime('%Y-%m-%d_%H:%M:%S')
+		if os.path.exists('/proc/version'):
+			fp = open('/proc/version', 'r')
+			val = fp.read().strip()
+			fp.close()
+			self.kernel = self.kernelVersion(val)
+		else:
+			self.kernel = 'unknown'
+	def kernelVersion(self, msg):
+		return msg.split()[2]
+	def kernelParams(self):
+		cmdline = 'initcall_debug log_buf_len=32M'
+		if self.useftrace:
+			cmdline += ' trace_buf_size=128M trace_clock=global '\
+			'trace_options=nooverwrite,funcgraph-abstime,funcgraph-cpu,'\
+			'funcgraph-duration,funcgraph-proc,funcgraph-tail,'\
+			'nofuncgraph-overhead,context-info,graph-time '\
+			'ftrace=function_graph '\
+			'ftrace_graph_max_depth=%d '\
+			'ftrace_graph_filter=%s' % \
+				(self.max_graph_depth, self.graph_filter)
+		return cmdline
+	def setGraphFilter(self, val):
+		fp = open(self.tpath+'available_filter_functions')
+		master = fp.read().split('\n')
+		fp.close()
+		for i in val.split(','):
+			func = i.strip()
+			if func not in master:
+				doError('function "%s" not available for ftrace' % func)
+		self.graph_filter = val
+	def cronjobCmdString(self):
+		cmdline = '%s -cronjob' % os.path.abspath(sys.argv[0])
+		args = iter(sys.argv[1:])
+		for arg in args:
+			if arg in ['-h', '-v', '-cronjob', '-reboot']:
+				continue
+			elif arg in ['-o', '-dmesg', '-ftrace', '-filter']:
+				args.next()
+				continue
+			cmdline += ' '+arg
+		if self.graph_filter != 'do_one_initcall':
+			cmdline += ' -filter "%s"' % self.graph_filter
+		cmdline += ' -o "%s"' % os.path.abspath(self.htmlfile)
+		return cmdline
+	def manualRebootRequired(self):
+		cmdline = self.kernelParams()
+		print 'To generate a new timeline manually, follow these steps:\n'
+		print '1. Add the CMDLINE string to your kernel command line.'
+		print '2. Reboot the system.'
+		print '3. After reboot, re-run this tool with the same arguments but no command (w/o -reboot or -manual).\n'
+		print 'CMDLINE="%s"' % cmdline
+		sys.exit()
+
+sysvals = SystemValues()
+
+# Class: Data
+# Description:
+#	 The primary container for test data.
+class Data(aslib.Data):
+	dmesg = {}  # root data structure
+	start = 0.0 # test start
+	end = 0.0   # test end
+	dmesgtext = []   # dmesg text file in memory
+	testnumber = 0
+	idstr = ''
+	html_device_id = 0
+	valid = False
+	initstart = 0.0
+	boottime = ''
+	phases = ['boot']
+	do_one_initcall = False
+	def __init__(self, num):
+		self.testnumber = num
+		self.idstr = 'a'
+		self.dmesgtext = []
+		self.dmesg = {
+			'boot': {'list': dict(), 'start': -1.0, 'end': -1.0, 'row': 0, 'color': '#dddddd'}
+		}
+	def deviceTopology(self):
+		return ''
+	def newAction(self, phase, name, start, end, ret, ulen):
+		# new device callback for a specific phase
+		self.html_device_id += 1
+		devid = '%s%d' % (self.idstr, self.html_device_id)
+		list = self.dmesg[phase]['list']
+		length = -1.0
+		if(start >= 0 and end >= 0):
+			length = end - start
+		i = 2
+		origname = name
+		while(name in list):
+			name = '%s[%d]' % (origname, i)
+			i += 1
+		list[name] = {'name': name, 'start': start, 'end': end,
+			'pid': 0, 'length': length, 'row': 0, 'id': devid,
+			'ret': ret, 'ulen': ulen }
+		return name
+	def deviceMatch(self, cg):
+		if cg.end - cg.start == 0:
+			return True
+		list = self.dmesg['boot']['list']
+		for devname in list:
+			dev = list[devname]
+			if cg.name == 'do_one_initcall':
+				if(cg.start <= dev['start'] and cg.end >= dev['end'] and dev['length'] > 0):
+					dev['ftrace'] = cg
+					self.do_one_initcall = True
+					return True
+			else:
+				if(cg.start > dev['start'] and cg.end < dev['end']):
+					if 'ftraces' not in dev:
+						dev['ftraces'] = []
+					dev['ftraces'].append(cg)
+					return True
+		return False
+
+# ----------------- FUNCTIONS --------------------
+
+# Function: loadKernelLog
+# Description:
+#	 Load a raw kernel log from dmesg
+def loadKernelLog():
+	data = Data(0)
+	data.dmesg['boot']['start'] = data.start = ktime = 0.0
+	sysvals.stamp = {
+		'time': datetime.now().strftime('%B %d %Y, %I:%M:%S %p'),
+		'host': sysvals.hostname,
+		'mode': 'boot', 'kernel': ''}
+
+	devtemp = dict()
+	if(sysvals.dmesgfile):
+		lf = open(sysvals.dmesgfile, 'r')
+	else:
+		lf = Popen('dmesg', stdout=PIPE).stdout
+	for line in lf:
+		line = line.replace('\r\n', '')
+		idx = line.find('[')
+		if idx > 1:
+			line = line[idx:]
+		m = re.match('[ \t]*(\[ *)(?P<ktime>[0-9\.]*)(\]) (?P<msg>.*)', line)
+		if(not m):
+			continue
+		ktime = float(m.group('ktime'))
+		if(ktime > 120):
+			break
+		msg = m.group('msg')
+		data.end = data.initstart = ktime
+		data.dmesgtext.append(line)
+		if(ktime == 0.0 and re.match('^Linux version .*', msg)):
+			if(not sysvals.stamp['kernel']):
+				sysvals.stamp['kernel'] = sysvals.kernelVersion(msg)
+			continue
+		m = re.match('.* setting system clock to (?P<t>.*) UTC.*', msg)
+		if(m):
+			bt = datetime.strptime(m.group('t'), '%Y-%m-%d %H:%M:%S')
+			bt = bt - timedelta(seconds=int(ktime))
+			data.boottime = bt.strftime('%Y-%m-%d_%H:%M:%S')
+			sysvals.stamp['time'] = bt.strftime('%B %d %Y, %I:%M:%S %p')
+			continue
+		m = re.match('^calling *(?P<f>.*)\+.*', msg)
+		if(m):
+			devtemp[m.group('f')] = ktime
+			continue
+		m = re.match('^initcall *(?P<f>.*)\+.* returned (?P<r>.*) after (?P<t>.*) usecs', msg)
+		if(m):
+			data.valid = True
+			f, r, t = m.group('f', 'r', 't')
+			if(f in devtemp):
+				data.newAction('boot', f, devtemp[f], ktime, int(r), int(t))
+				data.end = ktime
+				del devtemp[f]
+			continue
+		if(re.match('^Freeing unused kernel memory.*', msg)):
+			break
+
+	data.dmesg['boot']['end'] = data.end
+	lf.close()
+	return data
+
+# Function: loadTraceLog
+# Description:
+#	 Check if trace is available and copy to a temp file
+def loadTraceLog(data):
+	# load the data to a temp file if none given
+	if not sysvals.ftracefile:
+		lib = aslib.sysvals
+		aslib.rootCheck(True)
+		if not lib.verifyFtrace():
+			doError('ftrace not available')
+		if lib.fgetVal('current_tracer').strip() != 'function_graph':
+			doError('ftrace not configured for a boot callgraph')
+		sysvals.ftracefile = '/tmp/boot_ftrace.%s.txt' % os.getpid()
+		call('cat '+lib.tpath+'trace > '+sysvals.ftracefile, shell=True)
+	if not sysvals.ftracefile:
+		doError('No trace data available')
+
+	# parse the trace log
+	ftemp = dict()
+	tp = aslib.TestProps()
+	tp.setTracerType('function_graph')
+	tf = open(sysvals.ftracefile, 'r')
+	for line in tf:
+		if line[0] == '#':
+			continue
+		m = re.match(tp.ftrace_line_fmt, line.strip())
+		if(not m):
+			continue
+		m_time, m_proc, m_pid, m_msg, m_dur = \
+			m.group('time', 'proc', 'pid', 'msg', 'dur')
+		if float(m_time) > data.end:
+			break
+		if(m_time and m_pid and m_msg):
+			t = aslib.FTraceLine(m_time, m_msg, m_dur)
+			pid = int(m_pid)
+		else:
+			continue
+		if t.fevent or t.fkprobe:
+			continue
+		key = (m_proc, pid)
+		if(key not in ftemp):
+			ftemp[key] = []
+			ftemp[key].append(aslib.FTraceCallGraph(pid))
+		cg = ftemp[key][-1]
+		if(cg.addLine(t)):
+			ftemp[key].append(aslib.FTraceCallGraph(pid))
+	tf.close()
+
+	# add the callgraph data to the device hierarchy
+	for key in ftemp:
+		proc, pid = key
+		for cg in ftemp[key]:
+			if len(cg.list) < 1 or cg.invalid:
+				continue
+			if(not cg.postProcess()):
+				print('Sanity check failed for %s-%d' % (proc, pid))
+				continue
+			# match cg data to devices
+			if not data.deviceMatch(cg):
+				print ' BAD: %s %s-%d [%f - %f]' % (cg.name, proc, pid, cg.start, cg.end)
+
+# Function: colorForName
+# Description:
+#	 Generate a repeatable color from a list for a given name
+def colorForName(name):
+	list = [
+		('c1', '#ec9999'),
+		('c2', '#ffc1a6'),
+		('c3', '#fff0a6'),
+		('c4', '#adf199'),
+		('c5', '#9fadea'),
+		('c6', '#a699c1'),
+		('c7', '#ad99b4'),
+		('c8', '#eaffea'),
+		('c9', '#dcecfb'),
+		('c10', '#ffffea')
+	]
+	i = 0
+	total = 0
+	count = len(list)
+	while i < len(name):
+		total += ord(name[i])
+		i += 1
+	return list[total % count]
+
+def cgOverview(cg, minlen):
+	stats = dict()
+	large = []
+	for l in cg.list:
+		if l.fcall and l.depth == 1:
+			if l.length >= minlen:
+				large.append(l)
+			if l.name not in stats:
+				stats[l.name] = [0, 0.0]
+			stats[l.name][0] += (l.length * 1000.0)
+			stats[l.name][1] += 1
+	return (large, stats)
+
+# Function: createBootGraph
+# Description:
+#	 Create the output html file from the resident test data
+# Arguments:
+#	 testruns: array of Data objects from parseKernelLog or parseTraceLog
+# Output:
+#	 True if the html file was created, false if it failed
+def createBootGraph(data, embedded):
+	# html function templates
+	html_srccall = '<div id={6} title="{5}" class="srccall" style="left:{1}%;top:{2}px;height:{3}px;width:{4}%;line-height:{3}px;">{0}</div>\n'
+	html_timetotal = '<table class="time1">\n<tr>'\
+		'<td class="blue">Time from Kernel Boot to start of User Mode: <b>{0} ms</b></td>'\
+		'</tr>\n</table>\n'
+
+	# device timeline
+	devtl = aslib.Timeline(100, 20)
+
+	# write the test title and general info header
+	devtl.createHeader(sysvals, 'noftrace')
+
+	# Generate the header for this timeline
+	t0 = data.start
+	tMax = data.end
+	tTotal = tMax - t0
+	if(tTotal == 0):
+		print('ERROR: No timeline data')
+		return False
+	boot_time = '%.0f'%(tTotal*1000)
+	devtl.html += html_timetotal.format(boot_time)
+
+	# determine the maximum number of rows we need to draw
+	phase = 'boot'
+	list = data.dmesg[phase]['list']
+	devlist = []
+	for devname in list:
+		d = aslib.DevItem(0, phase, list[devname])
+		devlist.append(d)
+	devtl.getPhaseRows(devlist)
+	devtl.calcTotalRows()
+
+	# draw the timeline background
+	devtl.createZoomBox()
+	boot = data.dmesg[phase]
+	length = boot['end']-boot['start']
+	left = '%.3f' % (((boot['start']-t0)*100.0)/tTotal)
+	width = '%.3f' % ((length*100.0)/tTotal)
+	devtl.html += devtl.html_tblock.format(phase, left, width, devtl.scaleH)
+	devtl.html += devtl.html_phase.format('0', '100', \
+		'%.3f'%devtl.scaleH, '%.3f'%devtl.bodyH, \
+		'white', '')
+
+	# draw the device timeline
+	num = 0
+	devstats = dict()
+	for devname in sorted(list):
+		cls, color = colorForName(devname)
+		dev = list[devname]
+		info = '@|%.3f|%.3f|%.3f|%d' % (dev['start']*1000.0, dev['end']*1000.0,
+			dev['ulen']/1000.0, dev['ret'])
+		devstats[dev['id']] = {'info':info}
+		dev['color'] = color
+		height = devtl.phaseRowHeight(0, phase, dev['row'])
+		top = '%.6f' % ((dev['row']*height) + devtl.scaleH)
+		left = '%.6f' % (((dev['start']-t0)*100)/tTotal)
+		width = '%.6f' % (((dev['end']-dev['start'])*100)/tTotal)
+		length = ' (%0.3f ms) ' % ((dev['end']-dev['start'])*1000)
+		devtl.html += devtl.html_device.format(dev['id'],
+			devname+length+'kernel_mode', left, top, '%.3f'%height,
+			width, devname, ' '+cls, '')
+		rowtop = devtl.phaseRowTop(0, phase, dev['row'])
+		height = '%.6f' % (devtl.rowH / 2)
+		top = '%.6f' % (rowtop + devtl.scaleH + (devtl.rowH / 2))
+		if data.do_one_initcall:
+			if('ftrace' not in dev):
+				continue
+			cg = dev['ftrace']
+			large, stats = cgOverview(cg, 0.001)
+			devstats[dev['id']]['fstat'] = stats
+			for l in large:
+				left = '%f' % (((l.time-t0)*100)/tTotal)
+				width = '%f' % (l.length*100/tTotal)
+				title = '%s (%0.3fms)' % (l.name, l.length * 1000.0)
+				devtl.html += html_srccall.format(l.name, left,
+					top, height, width, title, 'x%d'%num)
+				num += 1
+			continue
+		if('ftraces' not in dev):
+			continue
+		for cg in dev['ftraces']:
+			left = '%f' % (((cg.start-t0)*100)/tTotal)
+			width = '%f' % ((cg.end-cg.start)*100/tTotal)
+			cglen = (cg.end - cg.start) * 1000.0
+			title = '%s (%0.3fms)' % (cg.name, cglen)
+			cg.id = 'x%d' % num
+			devtl.html += html_srccall.format(cg.name, left,
+				top, height, width, title, dev['id']+cg.id)
+			num += 1
+
+	# draw the time scale, try to make the number of labels readable
+	devtl.createTimeScale(t0, tMax, tTotal, phase)
+	devtl.html += '</div>\n'
+
+	# timeline is finished
+	devtl.html += '</div>\n</div>\n'
+
+	if(sysvals.outfile == sysvals.htmlfile):
+		hf = open(sysvals.htmlfile, 'a')
+	else:
+		hf = open(sysvals.htmlfile, 'w')
+
+	# add the css if this is not an embedded run
+	extra = '\
+		.c1 {background:rgba(209,0,0,0.4);}\n\
+		.c2 {background:rgba(255,102,34,0.4);}\n\
+		.c3 {background:rgba(255,218,33,0.4);}\n\
+		.c4 {background:rgba(51,221,0,0.4);}\n\
+		.c5 {background:rgba(17,51,204,0.4);}\n\
+		.c6 {background:rgba(34,0,102,0.4);}\n\
+		.c7 {background:rgba(51,0,68,0.4);}\n\
+		.c8 {background:rgba(204,255,204,0.4);}\n\
+		.c9 {background:rgba(169,208,245,0.4);}\n\
+		.c10 {background:rgba(255,255,204,0.4);}\n\
+		.vt {transform:rotate(-60deg);transform-origin:0 0;}\n\
+		table.fstat {table-layout:fixed;padding:150px 15px 0 0;font-size:10px;column-width:30px;}\n\
+		.fstat th {width:55px;}\n\
+		.fstat td {text-align:left;width:35px;}\n\
+		.srccall {position:absolute;font-size:10px;z-index:7;overflow:hidden;color:black;text-align:center;white-space:nowrap;border-radius:5px;border:1px solid black;background:linear-gradient(to bottom right,#CCC,#969696);}\n\
+		.srccall:hover {color:white;font-weight:bold;border:1px solid white;}\n'
+	if(not embedded):
+		aslib.addCSS(hf, sysvals, 1, False, extra)
+
+	# write the device timeline
+	hf.write(devtl.html)
+
+	# add boot specific html
+	statinfo = 'var devstats = {\n'
+	for n in sorted(devstats):
+		statinfo += '\t"%s": [\n\t\t"%s",\n' % (n, devstats[n]['info'])
+		if 'fstat' in devstats[n]:
+			funcs = devstats[n]['fstat']
+			for f in sorted(funcs, key=funcs.get, reverse=True):
+				if funcs[f][0] < 0.01 and len(funcs) > 10:
+					break
+				statinfo += '\t\t"%f|%s|%d",\n' % (funcs[f][0], f, funcs[f][1])
+		statinfo += '\t],\n'
+	statinfo += '};\n'
+	html = \
+		'<div id="devicedetailtitle"></div>\n'\
+		'<div id="devicedetail" style="display:none;">\n'\
+		'<div id="devicedetail0">\n'\
+		'<div id="kernel_mode" class="phaselet" style="left:0%;width:100%;background:#DDDDDD"></div>\n'\
+		'</div>\n</div>\n'\
+		'<script type="text/javascript">\n'+statinfo+\
+		'</script>\n'
+	hf.write(html)
+
+	# add the callgraph html
+	if(sysvals.usecallgraph):
+		aslib.addCallgraphs(sysvals, hf, data)
+
+	# add the dmesg log as a hidden div
+	if sysvals.addlogs:
+		hf.write('<div id="dmesglog" style="display:none;">\n')
+		for line in data.dmesgtext:
+			line = line.replace('<', '&lt').replace('>', '&gt')
+			hf.write(line)
+		hf.write('</div>\n')
+
+	if(not embedded):
+		# write the footer and close
+		aslib.addScriptCode(hf, [data])
+		hf.write('</body>\n</html>\n')
+	else:
+		# embedded out will be loaded in a page, skip the js
+		hf.write('<div id=bounds style=display:none>%f,%f</div>' % \
+			(data.start*1000, data.initstart*1000))
+	hf.close()
+	return True
+
+# Function: updateCron
+# Description:
+#    (restore=False) Set the tool to run automatically on reboot
+#    (restore=True) Restore the original crontab
+def updateCron(restore=False):
+	if not restore:
+		sysvals.rootUser(True)
+	crondir = '/var/spool/cron/crontabs/'
+	cronfile = crondir+'root'
+	backfile = crondir+'root-analyze_boot-backup'
+	if not os.path.exists(crondir):
+		doError('%s not found' % crondir)
+	out = Popen(['which', 'crontab'], stdout=PIPE).stdout.read()
+	if not out:
+		doError('crontab not found')
+	# on restore: move the backup cron back into place
+	if restore:
+		if os.path.exists(backfile):
+			shutil.move(backfile, cronfile)
+		return
+	# backup current cron and install new one with reboot
+	if os.path.exists(cronfile):
+		shutil.move(cronfile, backfile)
+	else:
+		fp = open(backfile, 'w')
+		fp.close()
+	res = -1
+	try:
+		fp = open(backfile, 'r')
+		op = open(cronfile, 'w')
+		for line in fp:
+			if '@reboot' not in line:
+				op.write(line)
+				continue
+		fp.close()
+		op.write('@reboot python %s\n' % sysvals.cronjobCmdString())
+		op.close()
+		res = call('crontab %s' % cronfile, shell=True)
+	except Exception, e:
+		print 'Exception: %s' % str(e)
+		shutil.move(backfile, cronfile)
+		res = -1
+	if res != 0:
+		doError('crontab failed')
+
+# Function: updateGrub
+# Description:
+#	 update grub.cfg for all kernels with our parameters
+def updateGrub(restore=False):
+	# call update-grub on restore
+	if restore:
+		try:
+			call(['update-grub'], stderr=PIPE, stdout=PIPE,
+				env={'PATH': '.:/sbin:/usr/sbin:/usr/bin:/sbin:/bin'})
+		except Exception, e:
+			print 'Exception: %s\n' % str(e)
+		return
+	# verify we can do this
+	sysvals.rootUser(True)
+	grubfile = '/etc/default/grub'
+	if not os.path.exists(grubfile):
+		print 'ERROR: Unable to set the kernel parameters via grub.\n'
+		sysvals.manualRebootRequired()
+	out = Popen(['which', 'update-grub'], stdout=PIPE).stdout.read()
+	if not out:
+		print 'ERROR: Unable to set the kernel parameters via grub.\n'
+		sysvals.manualRebootRequired()
+
+	# extract the option and create a grub config without it
+	tgtopt = 'GRUB_CMDLINE_LINUX_DEFAULT'
+	cmdline = ''
+	tempfile = '/etc/default/grub.analyze_boot'
+	shutil.move(grubfile, tempfile)
+	res = -1
+	try:
+		fp = open(tempfile, 'r')
+		op = open(grubfile, 'w')
+		cont = False
+		for line in fp:
+			line = line.strip()
+			if len(line) == 0 or line[0] == '#':
+				continue
+			opt = line.split('=')[0].strip()
+			if opt == tgtopt:
+				cmdline = line.split('=', 1)[1].strip('\\')
+				if line[-1] == '\\':
+					cont = True
+			elif cont:
+				cmdline += line.strip('\\')
+				if line[-1] != '\\':
+					cont = False
+			else:
+				op.write('%s\n' % line)
+		fp.close()
+		# if the target option value is in quotes, strip them
+		sp = '"'
+		val = cmdline.strip()
+		if val[0] == '\'' or val[0] == '"':
+			sp = val[0]
+			val = val.strip(sp)
+		cmdline = val
+		# append our cmd line options
+		if len(cmdline) > 0:
+			cmdline += ' '
+		cmdline += sysvals.kernelParams()
+		# write out the updated target option
+		op.write('\n%s=%s%s%s\n' % (tgtopt, sp, cmdline, sp))
+		op.close()
+		res = call('update-grub')
+		os.remove(grubfile)
+	except Exception, e:
+		print 'Exception: %s' % str(e)
+		res = -1
+	# cleanup
+	shutil.move(tempfile, grubfile)
+	if res != 0:
+		doError('update-grub failed')
+
+# Function: doError
+# Description:
+#	 generic error function for catastrphic failures
+# Arguments:
+#	 msg: the error message to print
+#	 help: True if printHelp should be called after, False otherwise
+def doError(msg, help=False):
+	if help == True:
+		printHelp()
+	print 'ERROR: %s\n' % msg
+	sys.exit()
+
+# Function: printHelp
+# Description:
+#	 print out the help text
+def printHelp():
+	print('')
+	print('%s v%.1f' % (sysvals.title, sysvals.version))
+	print('Usage: bootgraph <options> <command>')
+	print('')
+	print('Description:')
+	print('  This tool reads in a dmesg log of linux kernel boot and')
+	print('  creates an html representation of the boot timeline up to')
+	print('  the start of the init process.')
+	print('')
+	print('  If no specific command is given the tool reads the current dmesg')
+	print('  and/or ftrace log and outputs bootgraph.html')
+	print('')
+	print('Options:')
+	print('  -h            Print this help text')
+	print('  -v            Print the current tool version')
+	print('  -addlogs      Add the dmesg log to the html output')
+	print('  -o file       Html timeline name (default: bootgraph.html)')
+	print(' [advanced]')
+	print('  -f            Use ftrace to add function detail (default: disabled)')
+	print('  -callgraph    Add callgraph detail, can be very large (default: disabled)')
+	print('  -maxdepth N   limit the callgraph data to N call levels (default: 2)')
+	print('  -mincg ms     Discard all callgraphs shorter than ms milliseconds (e.g. 0.001 for us)')
+	print('  -timeprec N   Number of significant digits in timestamps (0:S, 3:ms, [6:us])')
+	print('  -expandcg     pre-expand the callgraph data in the html output (default: disabled)')
+	print('  -filter list  Limit ftrace to comma-delimited list of functions (default: do_one_initcall)')
+	print(' [commands]')
+	print('  -reboot       Reboot the machine automatically and generate a new timeline')
+	print('  -manual       Show the requirements to generate a new timeline manually')
+	print('  -dmesg file   Load a stored dmesg file (used with -ftrace)')
+	print('  -ftrace file  Load a stored ftrace file (used with -dmesg)')
+	print('  -flistall     Print all functions capable of being captured in ftrace')
+	print('')
+	return True
+
+# ----------------- MAIN --------------------
+# exec start (skipped if script is loaded as library)
+if __name__ == '__main__':
+	# loop through the command line arguments
+	cmd = ''
+	simplecmds = ['-updategrub', '-flistall']
+	args = iter(sys.argv[1:])
+	for arg in args:
+		if(arg == '-h'):
+			printHelp()
+			sys.exit()
+		elif(arg == '-v'):
+			print("Version %.1f" % sysvals.version)
+			sys.exit()
+		elif(arg in simplecmds):
+			cmd = arg[1:]
+		elif(arg == '-f'):
+			sysvals.useftrace = True
+		elif(arg == '-callgraph'):
+			sysvals.useftrace = True
+			sysvals.usecallgraph = True
+		elif(arg == '-mincg'):
+			sysvals.mincglen = aslib.getArgFloat('-mincg', args, 0.0, 10000.0)
+		elif(arg == '-timeprec'):
+			sysvals.setPrecision(aslib.getArgInt('-timeprec', args, 0, 6))
+		elif(arg == '-maxdepth'):
+			sysvals.max_graph_depth = aslib.getArgInt('-maxdepth', args, 0, 1000)
+		elif(arg == '-filter'):
+			try:
+				val = args.next()
+			except:
+				doError('No filter functions supplied', True)
+			aslib.rootCheck(True)
+			sysvals.setGraphFilter(val)
+		elif(arg == '-ftrace'):
+			try:
+				val = args.next()
+			except:
+				doError('No ftrace file supplied', True)
+			if(os.path.exists(val) == False):
+				doError('%s does not exist' % val)
+			sysvals.ftracefile = val
+		elif(arg == '-addlogs'):
+			sysvals.addlogs = True
+		elif(arg == '-expandcg'):
+			sysvals.cgexp = True
+		elif(arg == '-dmesg'):
+			try:
+				val = args.next()
+			except:
+				doError('No dmesg file supplied', True)
+			if(os.path.exists(val) == False):
+				doError('%s does not exist' % val)
+			if(sysvals.htmlfile == val or sysvals.outfile == val):
+				doError('Output filename collision')
+			sysvals.dmesgfile = val
+		elif(arg == '-o'):
+			try:
+				val = args.next()
+			except:
+				doError('No HTML filename supplied', True)
+			if(sysvals.dmesgfile == val or sysvals.ftracefile == val):
+				doError('Output filename collision')
+			sysvals.htmlfile = val
+		elif(arg == '-reboot'):
+			if sysvals.iscronjob:
+				doError('-reboot and -cronjob are incompatible')
+			sysvals.reboot = True
+		elif(arg == '-manual'):
+			sysvals.reboot = True
+			sysvals.manual = True
+		# remaining options are only for cron job use
+		elif(arg == '-cronjob'):
+			sysvals.iscronjob = True
+			if sysvals.reboot:
+				doError('-reboot and -cronjob are incompatible')
+		else:
+			doError('Invalid argument: '+arg, True)
+
+	if cmd != '':
+		if cmd == 'updategrub':
+			updateGrub()
+		elif cmd == 'flistall':
+			sysvals.getFtraceFilterFunctions(False)
+		sys.exit()
+
+	# update grub, setup a cronjob, and reboot
+	if sysvals.reboot:
+		if not sysvals.manual:
+			updateGrub()
+			updateCron()
+			call('reboot')
+		else:
+			sysvals.manualRebootRequired()
+		sys.exit()
+
+	# disable the cronjob
+	if sysvals.iscronjob:
+		updateCron(True)
+		updateGrub(True)
+
+	data = loadKernelLog()
+	if sysvals.useftrace:
+		loadTraceLog(data)
+		if sysvals.iscronjob:
+			try:
+				sysvals.fsetVal('0', 'tracing_on')
+			except:
+				pass
+
+	if(sysvals.outfile and sysvals.phoronix):
+		fp = open(sysvals.outfile, 'w')
+		fp.write('pass %s initstart %.3f end %.3f boot %s\n' %
+			(data.valid, data.initstart*1000, data.end*1000, data.boottime))
+		fp.close()
+	if(not data.valid):
+		if sysvals.dmesgfile:
+			doError('No initcall data found in %s' % sysvals.dmesgfile)
+		else:
+			doError('No initcall data found, is initcall_debug enabled?')
+
+	print('          Host: %s' % sysvals.hostname)
+	print('     Test time: %s' % sysvals.testtime)
+	print('     Boot time: %s' % data.boottime)
+	print('Kernel Version: %s' % sysvals.kernel)
+	print('  Kernel start: %.3f' % (data.start * 1000))
+	print('    init start: %.3f' % (data.initstart * 1000))
+
+	createBootGraph(data, sysvals.phoronix)