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Preview: plugin_vm.py Size: 3.48 KB

/lib/python3.6/site-packages/tuned/plugins/plugin_vm.py

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

Name	Size	Perms	Modified	Actions
instance DIR	-	drwxr-xr-x	2025-03-30 04:15:50	Edit Download recursive recursive
__pycache__ DIR	-	drwxr-xr-x	2025-03-30 04:15:50	Edit Download recursive recursive
base.py	21.89 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
decorators.py	983 B	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
exceptions.py	99 B	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
hotplug.py	3.84 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_acpi.py	2.39 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_audio.py	3.13 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_bootloader.py	25.31 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_cpu.py	27.56 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_disk.py	16.65 KB	lrw-r--r--	2025-03-11 07:42:24	Edit Download recursive recursive
plugin_eeepc_she.py	2.88 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_irqbalance.py	3.47 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_modules.py	4.81 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_mounts.py	5.45 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_net.py	22.71 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_rtentsk.py	1.08 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_scheduler.py	54.94 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_script.py	3.76 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_scsi_host.py	3.08 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_selinux.py	2.27 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_service.py	10.47 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_sysctl.py	6.74 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_sysfs.py	2.63 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_systemd.py	5.30 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_uncore.py	4.61 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_usb.py	1.97 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_video.py	3.72 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
plugin_vm.py	3.48 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
repository.py	1.49 KB	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive
__init__.py	49 B	lrw-r--r--	2024-02-22 12:23:28	Edit Download recursive recursive

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