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from . import base
from .decorators import *
import tuned.logs
import os
import errno
import struct
import glob
from tuned.utils.commands import commands
log = tuned.logs.get()
cmd = commands()
class VMPlugin(base.Plugin):
"""
`vm`::
Enables or disables transparent huge pages depending on value of the
[option]`transparent_hugepages` option. The option can have one of three
possible values `always`, `madvise` and `never`.
+
.Disable transparent hugepages
====
----
[vm]
transparent_hugepages=never
----
====
+
The [option]`transparent_hugepage.defrag` option specifies the
defragmentation policy. Possible values for this option are `always`,
`defer`, `defer+madvise`, `madvise` and `never`. For a detailed
explanation of these values refer to
link:https://www.kernel.org/doc/Documentation/vm/transhuge.txt[Transparent Hugepage Support].
"""
@classmethod
def _get_config_options(self):
return {
"transparent_hugepages" : None,
"transparent_hugepage" : None,
"transparent_hugepage.defrag" : None,
}
def _instance_init(self, instance):
instance._has_static_tuning = True
instance._has_dynamic_tuning = False
def _instance_cleanup(self, instance):
pass
@classmethod
def _thp_path(self):
path = "/sys/kernel/mm/transparent_hugepage"
if not os.path.exists(path):
# RHEL-6 support
path = "/sys/kernel/mm/redhat_transparent_hugepage"
return path
@command_set("transparent_hugepages")
def _set_transparent_hugepages(self, value, sim, remove):
if value not in ["always", "never", "madvise"]:
if not sim:
log.warn("Incorrect 'transparent_hugepages' value '%s'." % str(value))
return None
cmdline = cmd.read_file("/proc/cmdline", no_error = True)
if cmdline.find("transparent_hugepage=") > 0:
if not sim:
log.info("transparent_hugepage is already set in kernel boot cmdline, ignoring value from profile")
return None
sys_file = os.path.join(self._thp_path(), "enabled")
if os.path.exists(sys_file):
if not sim:
cmd.write_to_file(sys_file, value, \
no_error = [errno.ENOENT] if remove else False)
return value
else:
if not sim:
log.warn("Option 'transparent_hugepages' is not supported on current hardware.")
return None
# just an alias to transparent_hugepages
@command_set("transparent_hugepage")
def _set_transparent_hugepage(self, value, sim, remove):
self._set_transparent_hugepages(value, sim, remove)
@command_get("transparent_hugepages")
def _get_transparent_hugepages(self):
sys_file = os.path.join(self._thp_path(), "enabled")
if os.path.exists(sys_file):
return cmd.get_active_option(cmd.read_file(sys_file))
else:
return None
# just an alias to transparent_hugepages
@command_get("transparent_hugepage")
def _get_transparent_hugepage(self):
return self._get_transparent_hugepages()
@command_set("transparent_hugepage.defrag")
def _set_transparent_hugepage_defrag(self, value, sim, remove):
sys_file = os.path.join(self._thp_path(), "defrag")
if os.path.exists(sys_file):
if not sim:
cmd.write_to_file(sys_file, value, \
no_error = [errno.ENOENT] if remove else False)
return value
else:
if not sim:
log.warn("Option 'transparent_hugepage.defrag' is not supported on current hardware.")
return None
@command_get("transparent_hugepage.defrag")
def _get_transparent_hugepage_defrag(self):
sys_file = os.path.join(self._thp_path(), "defrag")
if os.path.exists(sys_file):
return cmd.get_active_option(cmd.read_file(sys_file))
else:
return None