晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib/python3.6/site-packages/tuned/plugins/plugin_rtentsk.py
from . import base
from .decorators import *
import tuned.logs
from tuned.utils.commands import commands
import glob
import socket
import time

log = tuned.logs.get()

class RTENTSKPlugin(base.Plugin):
	"""
	`rtentsk`::
	
	Plugin for avoiding interruptions due to static key IPIs due
        to opening socket with timestamping enabled (by opening a
        socket ourselves the static key is kept enabled).
	"""

	def _instance_init(self, instance):
		instance._has_static_tuning = True
		instance._has_dynamic_tuning = False

		# SO_TIMESTAMP nor SOF_TIMESTAMPING_OPT_TX_SWHW is defined by
		# the socket class

		SO_TIMESTAMP = 29 # see include/uapi/asm-generic/socket.h
		#define SO_TIMESTAMP 0x4012 # parisc!
		SOF_TIMESTAMPING_OPT_TX_SWHW = (1<<14) # see include/uapi/linux/net_tstamp.h

		s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
		s.setsockopt(socket.SOL_SOCKET, SO_TIMESTAMP, SOF_TIMESTAMPING_OPT_TX_SWHW)
		self.rtentsk_socket = s
		log.info("opened SOF_TIMESTAMPING_OPT_TX_SWHW socket")

	def _instance_cleanup(self, instance):
		s = self.rtentsk_socket
		s.close()

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