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 : //usr/include/linux/cgroupstats.h
/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */
/* cgroupstats.h - exporting per-cgroup statistics
 *
 * Copyright IBM Corporation, 2007
 * Author Balbir Singh <balbir@linux.vnet.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef _LINUX_CGROUPSTATS_H
#define _LINUX_CGROUPSTATS_H

#include <linux/types.h>
#include <linux/taskstats.h>

/*
 * Data shared between user space and kernel space on a per cgroup
 * basis. This data is shared using taskstats.
 *
 * Most of these states are derived by looking at the task->state value
 * For the nr_io_wait state, a flag in the delay accounting structure
 * indicates that the task is waiting on IO
 *
 * Each member is aligned to a 8 byte boundary.
 */
struct cgroupstats {
	__u64	nr_sleeping;		/* Number of tasks sleeping */
	__u64	nr_running;		/* Number of tasks running */
	__u64	nr_stopped;		/* Number of tasks in stopped state */
	__u64	nr_uninterruptible;	/* Number of tasks in uninterruptible */
					/* state */
	__u64	nr_io_wait;		/* Number of tasks waiting on IO */
};

/*
 * Commands sent from userspace
 * Not versioned. New commands should only be inserted at the enum's end
 * prior to __CGROUPSTATS_CMD_MAX
 */

enum {
	CGROUPSTATS_CMD_UNSPEC = __TASKSTATS_CMD_MAX,	/* Reserved */
	CGROUPSTATS_CMD_GET,		/* user->kernel request/get-response */
	CGROUPSTATS_CMD_NEW,		/* kernel->user event */
	__CGROUPSTATS_CMD_MAX,
};

#define CGROUPSTATS_CMD_MAX (__CGROUPSTATS_CMD_MAX - 1)

enum {
	CGROUPSTATS_TYPE_UNSPEC = 0,	/* Reserved */
	CGROUPSTATS_TYPE_CGROUP_STATS,	/* contains name + stats */
	__CGROUPSTATS_TYPE_MAX,
};

#define CGROUPSTATS_TYPE_MAX (__CGROUPSTATS_TYPE_MAX - 1)

enum {
	CGROUPSTATS_CMD_ATTR_UNSPEC = 0,
	CGROUPSTATS_CMD_ATTR_FD,
	__CGROUPSTATS_CMD_ATTR_MAX,
};

#define CGROUPSTATS_CMD_ATTR_MAX (__CGROUPSTATS_CMD_ATTR_MAX - 1)

#endif /* _LINUX_CGROUPSTATS_H */

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