/* 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 */