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import os
import glob
import tuned.logs
from . import base
import tuned.consts as consts
log = tuned.logs.get()
class calc_isolated_cores(base.Function):
"""
Calculates and returns isolated cores. The argument specifies how many
cores per socket reserve for housekeeping. If not specified, 1 core
per socket is reserved for housekeeping and the rest is isolated.
"""
def __init__(self):
# max 1 argument
super(calc_isolated_cores, self).__init__("calc_isolated_cores", 1)
def execute(self, args):
if not super(calc_isolated_cores, self).execute(args):
return None
cpus_reserve = 1
if len(args) > 0:
if not args[0].isdecimal() or int(args[0]) < 0:
log.error("invalid argument '%s' for builtin function '%s', it must be non-negative integer" %
(args[0], self._name))
return None
else:
cpus_reserve = int(args[0])
topo = {}
for cpu in glob.iglob(os.path.join(consts.SYSFS_CPUS_PATH, "cpu*")):
cpuid = os.path.basename(cpu)[3:]
if cpuid.isdecimal():
physical_package_id = os.path.join(cpu, "topology/physical_package_id")
# Show no errors when the physical_package_id file does not exist -- the CPU may be offline.
if not os.path.exists(physical_package_id):
log.debug("file '%s' does not exist, cpu%s offline?" % (physical_package_id, cpuid))
continue
socket = self._cmd.read_file(physical_package_id).strip()
if socket.isdecimal():
topo[socket] = topo.get(socket, []) + [cpuid]
isol_cpus = []
for cpus in topo.values():
cpus.sort(key = int)
isol_cpus = isol_cpus + cpus[cpus_reserve:]
isol_cpus.sort(key = int)
return ",".join(isol_cpus)