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import gen.rv as rv
from common import try_get_config_option
from gen.generator import GenOption,Generator,NAMED_UTILIZATIONS,NAMED_PERIODS
NAMED_SHARES = {
'weighted' : [1, 1, 8, 1],
'harmonic' : [1, 2, 4, 1],
'fair' : [1, 1, 1, 1],
}
TP_BASE = """#for $t in $lvl{0}
{1}-g {0} -s $scale{0} $t.cost $t.period
#end for"""
TP_LVLA = """#if $lvla
/proc/litmus/plugins/MC-CE/ce_file{
#for $t in $lvla
$t.cpu, $t.id, $t.budget
#end for
}
#end if
""" + TP_BASE.format("a", "-i $t.id -p $t.cpu ")
TP_LVLB = TP_BASE.format("b", "-p $t.cpu ")
TP_LVLC = TP_BASE.format("c", "")
TP_LVLD = """#if $be
#for $i in range($cpus)
#if $d_fifo
#set $fopt='-f'
#else
#set $fopt=''
#end if
#if d_nice
#set $nopt='-n'
#else
#set $nopt=''
#end if
bespin -s $i -f $i.misses $be_opts -p $i $fopt $nopt
#end for
#end if"""
TM_OPT = 'MERGE_TIMERS'
SS_OPT = 'PLUGIN_MC_LINUX_SLACK_STEALING'
RD_OPT = 'PLUGIN_MC_REDIRECT'
MC_OPT = 'PLUGIN_MC'
LEVELS = 3
class McGenerator(Generator):
def __init__(self, params = {}):
super(McGenerator, self).__init__("MC",
[TP_LVLA, TP_LVLB, TP_LVLC, TP_LVLD],
self.__make_options(),
params)
def __make_options(self):
timer_merging = try_get_config_option(TM_OPT, False)
slack_stealing = try_get_config_option(SS_OPT, False)
redirect = try_get_config_option(RD_OPT, True)
return [GenOption('levels', range(1, LEVELS+1), [3],
'Number of criticality levels: C, BC, ABC'),
GenOption('be', [True,False], [False],
'Execute background work using bespin.'),
GenOption('timer_merging', [True,False], [timer_merging],
'Require timer-merging support.'),
GenOption('redirect', [True,False], [redirect],
'Redirect work to the interrupt master.'),
GenOption('slack_stealing', [True,False], [slack_stealing],
'Schedule linux tasks in the background.'),
GenOption('d_nice', [True,False], [False],
'Schedule level-D tasks using nice().'),
GenOption('d_fifo', [True, False], [False],
'Schedule level-D tasks under SCHED_FIFO.'),
GenOption('a_hyperperiod', float, 25.0,
'Level-A hyperperiod (ms).'),
Generator._dist_option('b_periods', ['harmonic'], NAMED_PERIODS,
'Level-B task periods. Harmonic is always used if level A is present.'),
Generator._dist_option('c_periods', ['harmonic'],
NAMED_PERIODS, 'Level-C task periods.'),
Generator._dist_option('a_utils', ['bimo-light'],
NAMED_UTILIZATIONS,
'Level-A task utilizations (at level A).'),
Generator._dist_option('b_utils', ['bimo-light'],
NAMED_UTILIZATIONS,
'Level-B task utilizations (at level B).'),
Generator._dist_option('c_utils', ['bimo-light'],
NAMED_UTILIZATIONS,
'Level-C task utilizations (at level C).'),
Generator._dist_option('shares', ['fair'], NAMED_SHARES,
'Distribution of actual utilizations.')]
def __partition_worst_fit(self, params, ts):
# Partition using worst-fit for most even distribution
utils = [0]*int(params['cpus'])
tasks = [0]*int(params['cpus'])
for t in ts:
t.cpu = utils.index(min(utils))
t.id = tasks[t.cpu]
utils[t.cpu] += t.utilization()
tasks[t.cpu] += 1
def __adjust(self, params, level):
# Adjust for levels which aren't used
ldiff = LEVELS - params['levels']
shares = self.shares[ldiff:]
level -= ldiff
return shares, level
def __get_max_util(self, params, level):
shares, level = self.__adjust(params, level)
return float(shares[level]) / sum(shares[:level]) * params['cpus']
def __get_scale(self, params, level):
shares, level = self.__adjust(params, level)
return float(shares[level]) / sum(shares)
def __create_lvla_sched(self, params):
if params['levels'] < 3:
return []
utils = self._create_dist('utilization', params['a_utils'],
NAMED_UTILIZATIONS)
periods = self._create_dist('period', params['a_hyperperiod'], None)
ts = self._create_taskset(params, periods, utils)
# Make the budget used by the cyclic executive larger than the
# actual WCET because of overheads
for t in ts:
t.budget = int(1.05 * 1000000 * t.cost)
t.wcet = int(t.cost)
self.__partition_worst_fit(params, ts)
return ts
def __create_lvlb_sched(self, params):
if params['levels'] < 2:
return []
utils = self._create_dist('utilization', params['b_utils'],
NAMED_UTILIZATIONS)
# Level-A is present, b must be harmonic with lvla hyperperiod
if params['levels'] > 2:
plist = [params['a_hyperperiod']*2**x for x in xrange(0, 4)]
periods = rv.uniform_choice(plist)
else:
periods = self._create_dist('period', params['b_periods'],
NAMED_PERIODS)
max_util = self.__get_max_util(params, 1)
ts = self._create_taskset(params, periods, utils, max_util)
self.__partition_worst_fit(params, ts)
return ts
def __create_lvlc_sched(self, params):
utils = self._create_dist('utilization', params['c_utils'],
NAMED_UTILIZATIONS)
periods = self._create_dist('period', params['c_periods'],
NAMED_PERIODS)
max_util = self.__get_max_util(params, 2)
return self._create_taskset(params, periods, utils, max_util)
def _create_exp(self, params):
# Ugly way of doing it
self.shares = self._create_dist('shares', params['shares'],
NAMED_SHARES)
tasks = {'lvla': self.__create_lvla_sched(params),
'lvlb': self.__create_lvlb_sched(params),
'lvlc': self.__create_lvlc_sched(params)}
conf_options = {MC_OPT : 'y'}
if params['timer_merging']:
conf_options[TM_OPT] = 'y'
if params['redirect']:
if not params['release_master']:
print("Forcing release master option to enable redirection.")
params['release_master'] = 'y'
conf_options[RD_OPT] = 'y'
if params['slack_stealing']:
conf_options[SS_OPT] = 'y'
scales = []
for index, level in enumerate('abc'):
scales += [('scale%s' % level, self.__get_scale(params, index))]
schedule_variables = params.items() + tasks.items() + scales
param_variables = params.items() + [('config-options',conf_options)]
self._write_schedule(dict(schedule_variables))
self._write_params(dict(param_variables))
# Ugly
del(self.shares)
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