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functions: added 'cpulist_invert' built-in function

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Inverts list of CPUs (makes its complement). For the complement it
gets number of present CPUs from the /sys/devices/system/cpu/present,
e.g. system with 4 CPUs (0-3), the inversion of list "0,2,3" will be "1".

Related: rhbz#1225135

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
This commit is contained in:
Jaroslav Škarvada 2015-06-08 14:21:50 +02:00
parent 246854f524
commit 6168d5e2e6
1 changed files with 24 additions and 0 deletions
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tuned/profiles/functions/function_cpulist_invert.py Normal file
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import os
import tuned.logs
import base
from tuned.utils.commands import commands
log = tuned.logs.get()
class cpulist_invert(base.Function):
"""
Inverts list of CPUs (makes its complement). For the complement it
gets number of present CPUs from the /sys/devices/system/cpu/present,
e.g. system with 4 CPUs (0-3), the inversion of list "0,2,3" will be
"1"
"""
def __init__(self):
# arbitrary number of arguments
super(self.__class__, self).__init__("cpulist_online", 0)
def execute(self, args):
if not super(self.__class__, self).execute(args):
return None
cpus = self._cmd.cpulist_unpack(",".join(args))
present = self._cmd.cpulist_unpack(self._cmd.read_file("/sys/devices/system/cpu/present"))
return ",".join(str(v) for v in set(present) - set(cpus))