#ifndef _LINUX_SCHED_H
  #define _LINUX_SCHED_H

  /*
   * cloning flags:
   */
  #define CSIGNAL		0x000000ff	/* signal mask to be sent at exit */
  #define CLONE_VM	0x00000100	/* set if VM shared between processes */
  #define CLONE_FS	0x00000200	/* set if fs info shared between processes */
  #define CLONE_FILES	0x00000400	/* set if open files shared between processes */
  #define CLONE_SIGHAND	0x00000800	/* set if signal handlers and blocked signals shared */
  #define CLONE_PTRACE	0x00002000	/* set if we want to let tracing continue on the child too */
  #define CLONE_VFORK	0x00004000	/* set if the parent wants the child to wake it up on mm_release */
  #define CLONE_PARENT	0x00008000	/* set if we want to have the same parent as the cloner */
  #define CLONE_THREAD	0x00010000	/* Same thread group? */
  #define CLONE_NEWNS	0x00020000	/* New namespace group? */
  #define CLONE_SYSVSEM	0x00040000	/* share system V SEM_UNDO semantics */
  #define CLONE_SETTLS	0x00080000	/* create a new TLS for the child */
  #define CLONE_PARENT_SETTID	0x00100000	/* set the TID in the parent */
  #define CLONE_CHILD_CLEARTID	0x00200000	/* clear the TID in the child */
  #define CLONE_DETACHED		0x00400000	/* Unused, ignored */
  #define CLONE_UNTRACED		0x00800000	/* set if the tracing process can't force CLONE_PTRACE on this clone */
  #define CLONE_CHILD_SETTID	0x01000000	/* set the TID in the child */

  /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state)
     and is now available for re-use. */

  #define CLONE_NEWUTS		0x04000000	/* New utsname group? */

  #define CLONE_NEWIPC		0x08000000	/* New ipcs */

  #define CLONE_NEWUSER		0x10000000	/* New user namespace */

  #define CLONE_NEWPID		0x20000000	/* New pid namespace */

  #define CLONE_NEWNET		0x40000000	/* New network namespace */

  #define CLONE_IO		0x80000000	/* Clone io context */

  
  /*
   * Scheduling policies
   */
  #define SCHED_NORMAL		0
  #define SCHED_FIFO		1
  #define SCHED_RR		2
  #define SCHED_BATCH		3

  /* SCHED_ISO: reserved but not implemented yet */
  #define SCHED_IDLE		5

  /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */
  #define SCHED_RESET_ON_FORK     0x40000000

  #ifdef __KERNEL__

  
  struct sched_param {
  	int sched_priority;
  };

  #include <asm/param.h>	/* for HZ */

  #include <linux/capability.h>
  #include <linux/threads.h>
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/timex.h>
  #include <linux/jiffies.h>
  #include <linux/rbtree.h>
  #include <linux/thread_info.h>
  #include <linux/cpumask.h>
  #include <linux/errno.h>
  #include <linux/nodemask.h>

  #include <linux/mm_types.h>

  
  #include <asm/system.h>

  #include <asm/page.h>
  #include <asm/ptrace.h>

  #include <asm/cputime.h>
  
  #include <linux/smp.h>
  #include <linux/sem.h>
  #include <linux/signal.h>

  #include <linux/compiler.h>
  #include <linux/completion.h>
  #include <linux/pid.h>
  #include <linux/percpu.h>
  #include <linux/topology.h>

  #include <linux/proportions.h>

  #include <linux/seccomp.h>

  #include <linux/rcupdate.h>

  #include <linux/rculist.h>

  #include <linux/rtmutex.h>

  #include <linux/time.h>
  #include <linux/param.h>
  #include <linux/resource.h>
  #include <linux/timer.h>
  #include <linux/hrtimer.h>

  #include <linux/task_io_accounting.h>

  #include <linux/latencytop.h>

  #include <linux/cred.h>

  #include <linux/llist.h>

  
  #include <asm/processor.h>

  struct exec_domain;

  struct futex_pi_state;

  struct robust_list_head;

  struct bio_list;

  struct fs_struct;

  struct perf_event_context;

  struct blk_plug;

  
  /*

   * List of flags we want to share for kernel threads,
   * if only because they are not used by them anyway.
   */
  #define CLONE_KERNEL	(CLONE_FS | CLONE_FILES | CLONE_SIGHAND)
  
  /*
   * These are the constant used to fake the fixed-point load-average
   * counting. Some notes:
   *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
   *    a load-average precision of 10 bits integer + 11 bits fractional
   *  - if you want to count load-averages more often, you need more
   *    precision, or rounding will get you. With 2-second counting freq,
   *    the EXP_n values would be 1981, 2034 and 2043 if still using only
   *    11 bit fractions.
   */
  extern unsigned long avenrun[];		/* Load averages */

  extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);

  
  #define FSHIFT		11		/* nr of bits of precision */
  #define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */

  #define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */

  #define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
  #define EXP_5		2014		/* 1/exp(5sec/5min) */
  #define EXP_15		2037		/* 1/exp(5sec/15min) */
  
  #define CALC_LOAD(load,exp,n) \
  	load *= exp; \
  	load += n*(FIXED_1-exp); \
  	load >>= FSHIFT;
  
  extern unsigned long total_forks;
  extern int nr_threads;

  DECLARE_PER_CPU(unsigned long, process_counts);
  extern int nr_processes(void);
  extern unsigned long nr_running(void);
  extern unsigned long nr_uninterruptible(void);
  extern unsigned long nr_iowait(void);

  extern unsigned long nr_iowait_cpu(int cpu);

  extern unsigned long this_cpu_load(void);

  extern void calc_global_load(unsigned long ticks);

  extern unsigned long get_parent_ip(unsigned long addr);

  struct seq_file;
  struct cfs_rq;

  struct task_group;

  #ifdef CONFIG_SCHED_DEBUG
  extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
  extern void proc_sched_set_task(struct task_struct *p);
  extern void

  print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);

  #else
  static inline void
  proc_sched_show_task(struct task_struct *p, struct seq_file *m)
  {
  }
  static inline void proc_sched_set_task(struct task_struct *p)
  {
  }
  static inline void

  print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)

  {
  }
  #endif

  /*
   * Task state bitmask. NOTE! These bits are also
   * encoded in fs/proc/array.c: get_task_state().
   *
   * We have two separate sets of flags: task->state
   * is about runnability, while task->exit_state are
   * about the task exiting. Confusing, but this way
   * modifying one set can't modify the other one by
   * mistake.
   */

  #define TASK_RUNNING		0
  #define TASK_INTERRUPTIBLE	1
  #define TASK_UNINTERRUPTIBLE	2

  #define __TASK_STOPPED		4
  #define __TASK_TRACED		8

  /* in tsk->exit_state */
  #define EXIT_ZOMBIE		16
  #define EXIT_DEAD		32
  /* in tsk->state again */

  #define TASK_DEAD		64

  #define TASK_WAKEKILL		128

  #define TASK_WAKING		256

  #define TASK_STATE_MAX		512

  #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW"

  extern char ___assert_task_state[1 - 2*!!(
  		sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];

  
  /* Convenience macros for the sake of set_task_state */
  #define TASK_KILLABLE		(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
  #define TASK_STOPPED		(TASK_WAKEKILL | __TASK_STOPPED)
  #define TASK_TRACED		(TASK_WAKEKILL | __TASK_TRACED)

  /* Convenience macros for the sake of wake_up */
  #define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)

  #define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)

  
  /* get_task_state() */
  #define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \

  				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
  				 __TASK_TRACED)

  #define task_is_traced(task)	((task->state & __TASK_TRACED) != 0)
  #define task_is_stopped(task)	((task->state & __TASK_STOPPED) != 0)

  #define task_is_dead(task)	((task)->exit_state != 0)

  #define task_is_stopped_or_traced(task)	\

  			((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)

  #define task_contributes_to_load(task)	\

  				((task->state & TASK_UNINTERRUPTIBLE) != 0 && \

  				 (task->flags & PF_FROZEN) == 0)

  
  #define __set_task_state(tsk, state_value)		\
  	do { (tsk)->state = (state_value); } while (0)
  #define set_task_state(tsk, state_value)		\
  	set_mb((tsk)->state, (state_value))

  /*
   * set_current_state() includes a barrier so that the write of current->state
   * is correctly serialised wrt the caller's subsequent test of whether to
   * actually sleep:
   *
   *	set_current_state(TASK_UNINTERRUPTIBLE);
   *	if (do_i_need_to_sleep())
   *		schedule();
   *
   * If the caller does not need such serialisation then use __set_current_state()
   */

  #define __set_current_state(state_value)			\
  	do { current->state = (state_value); } while (0)
  #define set_current_state(state_value)		\
  	set_mb(current->state, (state_value))
  
  /* Task command name length */
  #define TASK_COMM_LEN 16

  #include <linux/spinlock.h>
  
  /*
   * This serializes "schedule()" and also protects
   * the run-queue from deletions/modifications (but
   * _adding_ to the beginning of the run-queue has
   * a separate lock).
   */
  extern rwlock_t tasklist_lock;
  extern spinlock_t mmlist_lock;

  struct task_struct;

  #ifdef CONFIG_PROVE_RCU
  extern int lockdep_tasklist_lock_is_held(void);
  #endif /* #ifdef CONFIG_PROVE_RCU */

  extern void sched_init(void);
  extern void sched_init_smp(void);

  extern asmlinkage void schedule_tail(struct task_struct *prev);

  extern void init_idle(struct task_struct *idle, int cpu);

  extern void init_idle_bootup_task(struct task_struct *idle);

  extern int runqueue_is_locked(int cpu);

  #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)

  extern void select_nohz_load_balancer(int stop_tick);

  extern void set_cpu_sd_state_idle(void);

  extern int get_nohz_timer_target(void);

  #else

  static inline void select_nohz_load_balancer(int stop_tick) { }

  static inline void set_cpu_sd_state_idle(void) { }

  #endif

  /*

   * Only dump TASK_* tasks. (0 for all tasks)

   */
  extern void show_state_filter(unsigned long state_filter);
  
  static inline void show_state(void)
  {

  	show_state_filter(0);

  }

  extern void show_regs(struct pt_regs *);
  
  /*
   * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
   * task), SP is the stack pointer of the first frame that should be shown in the back
   * trace (or NULL if the entire call-chain of the task should be shown).
   */
  extern void show_stack(struct task_struct *task, unsigned long *sp);
  
  void io_schedule(void);
  long io_schedule_timeout(long timeout);
  
  extern void cpu_init (void);
  extern void trap_init(void);
  extern void update_process_times(int user);
  extern void scheduler_tick(void);

  extern void sched_show_task(struct task_struct *p);

  #ifdef CONFIG_LOCKUP_DETECTOR

  extern void touch_softlockup_watchdog(void);

  extern void touch_softlockup_watchdog_sync(void);

  extern void touch_all_softlockup_watchdogs(void);

  extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
  				  void __user *buffer,
  				  size_t *lenp, loff_t *ppos);

  extern unsigned int  softlockup_panic;

  void lockup_detector_init(void);

  #else

  static inline void touch_softlockup_watchdog(void)
  {
  }

  static inline void touch_softlockup_watchdog_sync(void)
  {
  }

  static inline void touch_all_softlockup_watchdogs(void)
  {
  }

  static inline void lockup_detector_init(void)
  {
  }

  #endif

  #ifdef CONFIG_DETECT_HUNG_TASK
  extern unsigned int  sysctl_hung_task_panic;
  extern unsigned long sysctl_hung_task_check_count;
  extern unsigned long sysctl_hung_task_timeout_secs;
  extern unsigned long sysctl_hung_task_warnings;
  extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,

  					 void __user *buffer,

  					 size_t *lenp, loff_t *ppos);

  #else
  /* Avoid need for ifdefs elsewhere in the code */
  enum { sysctl_hung_task_timeout_secs = 0 };

  #endif

  /* Attach to any functions which should be ignored in wchan output. */
  #define __sched		__attribute__((__section__(".sched.text")))

  
  /* Linker adds these: start and end of __sched functions */
  extern char __sched_text_start[], __sched_text_end[];

  /* Is this address in the __sched functions? */
  extern int in_sched_functions(unsigned long addr);
  
  #define	MAX_SCHEDULE_TIMEOUT	LONG_MAX

  extern signed long schedule_timeout(signed long timeout);

  extern signed long schedule_timeout_interruptible(signed long timeout);

  extern signed long schedule_timeout_killable(signed long timeout);

  extern signed long schedule_timeout_uninterruptible(signed long timeout);

  asmlinkage void schedule(void);

  extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner);

  struct nsproxy;

  struct user_namespace;

  /*
   * Default maximum number of active map areas, this limits the number of vmas
   * per mm struct. Users can overwrite this number by sysctl but there is a
   * problem.
   *
   * When a program's coredump is generated as ELF format, a section is created
   * per a vma. In ELF, the number of sections is represented in unsigned short.
   * This means the number of sections should be smaller than 65535 at coredump.
   * Because the kernel adds some informative sections to a image of program at
   * generating coredump, we need some margin. The number of extra sections is
   * 1-3 now and depends on arch. We use "5" as safe margin, here.
   */
  #define MAPCOUNT_ELF_CORE_MARGIN	(5)

  #define DEFAULT_MAX_MAP_COUNT	(USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN)

  
  extern int sysctl_max_map_count;
  
  #include <linux/aio.h>

  #ifdef CONFIG_MMU
  extern void arch_pick_mmap_layout(struct mm_struct *mm);

  extern unsigned long
  arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
  		       unsigned long, unsigned long);
  extern unsigned long
  arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
  			  unsigned long len, unsigned long pgoff,
  			  unsigned long flags);

  extern void arch_unmap_area(struct mm_struct *, unsigned long);
  extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long);

  #else
  static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
  #endif

  extern void set_dumpable(struct mm_struct *mm, int value);
  extern int get_dumpable(struct mm_struct *mm);
  
  /* mm flags */

  /* dumpable bits */

  #define MMF_DUMPABLE      0  /* core dump is permitted */
  #define MMF_DUMP_SECURELY 1  /* core file is readable only by root */

  #define MMF_DUMPABLE_BITS 2

  #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)

  
  /* coredump filter bits */
  #define MMF_DUMP_ANON_PRIVATE	2
  #define MMF_DUMP_ANON_SHARED	3
  #define MMF_DUMP_MAPPED_PRIVATE	4
  #define MMF_DUMP_MAPPED_SHARED	5

  #define MMF_DUMP_ELF_HEADERS	6

  #define MMF_DUMP_HUGETLB_PRIVATE 7
  #define MMF_DUMP_HUGETLB_SHARED  8

  #define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS

  #define MMF_DUMP_FILTER_BITS	7

  #define MMF_DUMP_FILTER_MASK \
  	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
  #define MMF_DUMP_FILTER_DEFAULT \

  	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\

  	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)
  
  #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
  # define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
  #else
  # define MMF_DUMP_MASK_DEFAULT_ELF	0
  #endif

  					/* leave room for more dump flags */
  #define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */

  #define MMF_VM_HUGEPAGE		17	/* set when VM_HUGEPAGE is set on vma */

  
  #define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)

  struct sighand_struct {
  	atomic_t		count;
  	struct k_sigaction	action[_NSIG];
  	spinlock_t		siglock;

  	wait_queue_head_t	signalfd_wqh;

  };

  struct pacct_struct {

  	int			ac_flag;
  	long			ac_exitcode;

  	unsigned long		ac_mem;

  	cputime_t		ac_utime, ac_stime;
  	unsigned long		ac_minflt, ac_majflt;

  };

  struct cpu_itimer {
  	cputime_t expires;
  	cputime_t incr;

  	u32 error;
  	u32 incr_error;

  };

  /**
   * struct task_cputime - collected CPU time counts
   * @utime:		time spent in user mode, in &cputime_t units
   * @stime:		time spent in kernel mode, in &cputime_t units
   * @sum_exec_runtime:	total time spent on the CPU, in nanoseconds

   *

   * This structure groups together three kinds of CPU time that are
   * tracked for threads and thread groups.  Most things considering
   * CPU time want to group these counts together and treat all three
   * of them in parallel.
   */
  struct task_cputime {
  	cputime_t utime;
  	cputime_t stime;
  	unsigned long long sum_exec_runtime;
  };
  /* Alternate field names when used to cache expirations. */
  #define prof_exp	stime
  #define virt_exp	utime
  #define sched_exp	sum_exec_runtime

  #define INIT_CPUTIME	\
  	(struct task_cputime) {					\

  		.utime = 0,					\
  		.stime = 0,					\

  		.sum_exec_runtime = 0,				\
  	}

  /*
   * Disable preemption until the scheduler is running.
   * Reset by start_kernel()->sched_init()->init_idle().

   *
   * We include PREEMPT_ACTIVE to avoid cond_resched() from working
   * before the scheduler is active -- see should_resched().

   */

  #define INIT_PREEMPT_COUNT	(1 + PREEMPT_ACTIVE)

  /**

   * struct thread_group_cputimer - thread group interval timer counts
   * @cputime:		thread group interval timers.
   * @running:		non-zero when there are timers running and
   * 			@cputime receives updates.
   * @lock:		lock for fields in this struct.

   *
   * This structure contains the version of task_cputime, above, that is

   * used for thread group CPU timer calculations.

   */

  struct thread_group_cputimer {
  	struct task_cputime cputime;
  	int running;

  	raw_spinlock_t lock;

  };

  #include <linux/rwsem.h>

  struct autogroup;

  /*

   * NOTE! "signal_struct" does not have its own

   * locking, because a shared signal_struct always
   * implies a shared sighand_struct, so locking
   * sighand_struct is always a proper superset of
   * the locking of signal_struct.
   */
  struct signal_struct {

  	atomic_t		sigcnt;

  	atomic_t		live;

  	int			nr_threads;

  
  	wait_queue_head_t	wait_chldexit;	/* for wait4() */
  
  	/* current thread group signal load-balancing target: */

  	struct task_struct	*curr_target;

  
  	/* shared signal handling: */
  	struct sigpending	shared_pending;
  
  	/* thread group exit support */
  	int			group_exit_code;
  	/* overloaded:
  	 * - notify group_exit_task when ->count is equal to notify_count
  	 * - everyone except group_exit_task is stopped during signal delivery
  	 *   of fatal signals, group_exit_task processes the signal.
  	 */

  	int			notify_count;

  	struct task_struct	*group_exit_task;

  
  	/* thread group stop support, overloads group_exit_code too */
  	int			group_stop_count;
  	unsigned int		flags; /* see SIGNAL_* flags below */
  
  	/* POSIX.1b Interval Timers */
  	struct list_head posix_timers;
  
  	/* ITIMER_REAL timer for the process */

  	struct hrtimer real_timer;

  	struct pid *leader_pid;

  	ktime_t it_real_incr;

  	/*
  	 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
  	 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
  	 * values are defined to 0 and 1 respectively
  	 */
  	struct cpu_itimer it[2];

  	/*

  	 * Thread group totals for process CPU timers.
  	 * See thread_group_cputimer(), et al, for details.

  	 */

  	struct thread_group_cputimer cputimer;

  
  	/* Earliest-expiration cache. */
  	struct task_cputime cputime_expires;
  
  	struct list_head cpu_timers[3];

  	struct pid *tty_old_pgrp;

  	/* boolean value for session group leader */
  	int leader;
  
  	struct tty_struct *tty; /* NULL if no tty */

  #ifdef CONFIG_SCHED_AUTOGROUP
  	struct autogroup *autogroup;
  #endif

  	/*
  	 * Cumulative resource counters for dead threads in the group,
  	 * and for reaped dead child processes forked by this group.
  	 * Live threads maintain their own counters and add to these
  	 * in __exit_signal, except for the group leader.
  	 */

  	cputime_t utime, stime, cutime, cstime;

  	cputime_t gtime;
  	cputime_t cgtime;

  #ifndef CONFIG_VIRT_CPU_ACCOUNTING
  	cputime_t prev_utime, prev_stime;
  #endif

  	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
  	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;

  	unsigned long inblock, oublock, cinblock, coublock;

  	unsigned long maxrss, cmaxrss;

  	struct task_io_accounting ioac;

  
  	/*

  	 * Cumulative ns of schedule CPU time fo dead threads in the
  	 * group, not including a zombie group leader, (This only differs
  	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
  	 * other than jiffies.)
  	 */
  	unsigned long long sum_sched_runtime;
  
  	/*

  	 * We don't bother to synchronize most readers of this at all,
  	 * because there is no reader checking a limit that actually needs
  	 * to get both rlim_cur and rlim_max atomically, and either one
  	 * alone is a single word that can safely be read normally.
  	 * getrlimit/setrlimit use task_lock(current->group_leader) to
  	 * protect this instead of the siglock, because they really
  	 * have no need to disable irqs.
  	 */
  	struct rlimit rlim[RLIM_NLIMITS];

  #ifdef CONFIG_BSD_PROCESS_ACCT
  	struct pacct_struct pacct;	/* per-process accounting information */
  #endif

  #ifdef CONFIG_TASKSTATS

  	struct taskstats *stats;
  #endif

  #ifdef CONFIG_AUDIT
  	unsigned audit_tty;
  	struct tty_audit_buf *tty_audit_buf;
  #endif

  #ifdef CONFIG_CGROUPS
  	/*

  	 * group_rwsem prevents new tasks from entering the threadgroup and
  	 * member tasks from exiting,a more specifically, setting of
  	 * PF_EXITING.  fork and exit paths are protected with this rwsem
  	 * using threadgroup_change_begin/end().  Users which require
  	 * threadgroup to remain stable should use threadgroup_[un]lock()
  	 * which also takes care of exec path.  Currently, cgroup is the
  	 * only user.

  	 */

  	struct rw_semaphore group_rwsem;

  #endif

  	int oom_adj;		/* OOM kill score adjustment (bit shift) */
  	int oom_score_adj;	/* OOM kill score adjustment */

  	int oom_score_adj_min;	/* OOM kill score adjustment minimum value.
  				 * Only settable by CAP_SYS_RESOURCE. */

  
  	struct mutex cred_guard_mutex;	/* guard against foreign influences on
  					 * credential calculations
  					 * (notably. ptrace) */

  };

  /* Context switch must be unlocked if interrupts are to be enabled */
  #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
  # define __ARCH_WANT_UNLOCKED_CTXSW
  #endif

  /*
   * Bits in flags field of signal_struct.
   */
  #define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */

  #define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */
  #define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */

  /*
   * Pending notifications to parent.
   */
  #define SIGNAL_CLD_STOPPED	0x00000010
  #define SIGNAL_CLD_CONTINUED	0x00000020
  #define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)

  #define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

  /* If true, all threads except ->group_exit_task have pending SIGKILL */
  static inline int signal_group_exit(const struct signal_struct *sig)
  {
  	return	(sig->flags & SIGNAL_GROUP_EXIT) ||
  		(sig->group_exit_task != NULL);
  }

  /*
   * Some day this will be a full-fledged user tracking system..
   */
  struct user_struct {
  	atomic_t __count;	/* reference count */
  	atomic_t processes;	/* How many processes does this user have? */
  	atomic_t files;		/* How many open files does this user have? */
  	atomic_t sigpending;	/* How many pending signals does this user have? */

  #ifdef CONFIG_INOTIFY_USER

  	atomic_t inotify_watches; /* How many inotify watches does this user have? */
  	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
  #endif

  #ifdef CONFIG_FANOTIFY
  	atomic_t fanotify_listeners;
  #endif

  #ifdef CONFIG_EPOLL

  	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */

  #endif

  #ifdef CONFIG_POSIX_MQUEUE

  	/* protected by mq_lock	*/
  	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */

  #endif

  	unsigned long locked_shm; /* How many pages of mlocked shm ? */
  
  #ifdef CONFIG_KEYS
  	struct key *uid_keyring;	/* UID specific keyring */
  	struct key *session_keyring;	/* UID's default session keyring */
  #endif
  
  	/* Hash table maintenance information */

  	struct hlist_node uidhash_node;

  	uid_t uid;

  	struct user_namespace *user_ns;

  #ifdef CONFIG_PERF_EVENTS

  	atomic_long_t locked_vm;
  #endif

  };

  extern int uids_sysfs_init(void);

  extern struct user_struct *find_user(uid_t);
  
  extern struct user_struct root_user;
  #define INIT_USER (&root_user)

  struct backing_dev_info;
  struct reclaim_state;

  #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)

  struct sched_info {
  	/* cumulative counters */

  	unsigned long pcount;	      /* # of times run on this cpu */

  	unsigned long long run_delay; /* time spent waiting on a runqueue */

  
  	/* timestamps */

  	unsigned long long last_arrival,/* when we last ran on a cpu */
  			   last_queued;	/* when we were last queued to run */

  };

  #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */

  #ifdef CONFIG_TASK_DELAY_ACCT
  struct task_delay_info {
  	spinlock_t	lock;
  	unsigned int	flags;	/* Private per-task flags */
  
  	/* For each stat XXX, add following, aligned appropriately
  	 *
  	 * struct timespec XXX_start, XXX_end;
  	 * u64 XXX_delay;
  	 * u32 XXX_count;
  	 *
  	 * Atomicity of updates to XXX_delay, XXX_count protected by
  	 * single lock above (split into XXX_lock if contention is an issue).
  	 */

  
  	/*
  	 * XXX_count is incremented on every XXX operation, the delay
  	 * associated with the operation is added to XXX_delay.
  	 * XXX_delay contains the accumulated delay time in nanoseconds.
  	 */
  	struct timespec blkio_start, blkio_end;	/* Shared by blkio, swapin */
  	u64 blkio_delay;	/* wait for sync block io completion */
  	u64 swapin_delay;	/* wait for swapin block io completion */
  	u32 blkio_count;	/* total count of the number of sync block */
  				/* io operations performed */
  	u32 swapin_count;	/* total count of the number of swapin block */
  				/* io operations performed */

  
  	struct timespec freepages_start, freepages_end;
  	u64 freepages_delay;	/* wait for memory reclaim */
  	u32 freepages_count;	/* total count of memory reclaim */

  };

  #endif	/* CONFIG_TASK_DELAY_ACCT */
  
  static inline int sched_info_on(void)
  {
  #ifdef CONFIG_SCHEDSTATS
  	return 1;
  #elif defined(CONFIG_TASK_DELAY_ACCT)
  	extern int delayacct_on;
  	return delayacct_on;
  #else
  	return 0;

  #endif

  }

  enum cpu_idle_type {
  	CPU_IDLE,
  	CPU_NOT_IDLE,
  	CPU_NEWLY_IDLE,
  	CPU_MAX_IDLE_TYPES

  };
  
  /*

   * Increase resolution of nice-level calculations for 64-bit architectures.
   * The extra resolution improves shares distribution and load balancing of
   * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
   * hierarchies, especially on larger systems. This is not a user-visible change
   * and does not change the user-interface for setting shares/weights.
   *
   * We increase resolution only if we have enough bits to allow this increased
   * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution
   * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the
   * increased costs.

   */

  #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load  */

  # define SCHED_LOAD_RESOLUTION	10
  # define scale_load(w)		((w) << SCHED_LOAD_RESOLUTION)
  # define scale_load_down(w)	((w) >> SCHED_LOAD_RESOLUTION)
  #else
  # define SCHED_LOAD_RESOLUTION	0
  # define scale_load(w)		(w)
  # define scale_load_down(w)	(w)
  #endif

  #define SCHED_LOAD_SHIFT	(10 + SCHED_LOAD_RESOLUTION)

  #define SCHED_LOAD_SCALE	(1L << SCHED_LOAD_SHIFT)

  /*
   * Increase resolution of cpu_power calculations
   */
  #define SCHED_POWER_SHIFT	10
  #define SCHED_POWER_SCALE	(1L << SCHED_POWER_SHIFT)

  /*
   * sched-domains (multiprocessor balancing) declarations:
   */

  #ifdef CONFIG_SMP

  #define SD_LOAD_BALANCE		0x0001	/* Do load balancing on this domain. */
  #define SD_BALANCE_NEWIDLE	0x0002	/* Balance when about to become idle */
  #define SD_BALANCE_EXEC		0x0004	/* Balance on exec */
  #define SD_BALANCE_FORK		0x0008	/* Balance on fork, clone */

  #define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */

  #define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */

  #define SD_PREFER_LOCAL		0x0040  /* Prefer to keep tasks local to this domain */

  #define SD_SHARE_CPUPOWER	0x0080	/* Domain members share cpu power */
  #define SD_POWERSAVINGS_BALANCE	0x0100	/* Balance for power savings */
  #define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
  #define SD_SERIALIZE		0x0400	/* Only a single load balancing instance */

  #define SD_ASYM_PACKING		0x0800  /* Place busy groups earlier in the domain */

  #define SD_PREFER_SIBLING	0x1000	/* Prefer to place tasks in a sibling domain */

  #define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */

  enum powersavings_balance_level {
  	POWERSAVINGS_BALANCE_NONE = 0,  /* No power saving load balance */
  	POWERSAVINGS_BALANCE_BASIC,	/* Fill one thread/core/package
  					 * first for long running threads
  					 */
  	POWERSAVINGS_BALANCE_WAKEUP,	/* Also bias task wakeups to semi-idle
  					 * cpu package for power savings
  					 */
  	MAX_POWERSAVINGS_BALANCE_LEVELS
  };

  extern int sched_mc_power_savings, sched_smt_power_savings;

  static inline int sd_balance_for_mc_power(void)
  {
  	if (sched_smt_power_savings)
  		return SD_POWERSAVINGS_BALANCE;

  	if (!sched_mc_power_savings)
  		return SD_PREFER_SIBLING;
  
  	return 0;

  }

  static inline int sd_balance_for_package_power(void)
  {
  	if (sched_mc_power_savings | sched_smt_power_savings)
  		return SD_POWERSAVINGS_BALANCE;

  	return SD_PREFER_SIBLING;

  }

  extern int __weak arch_sd_sibiling_asym_packing(void);

  /*
   * Optimise SD flags for power savings:

   * SD_BALANCE_NEWIDLE helps aggressive task consolidation and power savings.

   * Keep default SD flags if sched_{smt,mc}_power_saving=0
   */
  
  static inline int sd_power_saving_flags(void)
  {
  	if (sched_mc_power_savings | sched_smt_power_savings)
  		return SD_BALANCE_NEWIDLE;
  
  	return 0;
  }

  struct sched_group_power {

  	atomic_t ref;

  	/*
  	 * CPU power of this group, SCHED_LOAD_SCALE being max power for a

  	 * single CPU.

  	 */

  	unsigned int power, power_orig;

  	/*
  	 * Number of busy cpus in this group.
  	 */
  	atomic_t nr_busy_cpus;

  };
  
  struct sched_group {
  	struct sched_group *next;	/* Must be a circular list */
  	atomic_t ref;

  	unsigned int group_weight;

  	struct sched_group_power *sgp;

  	/*
  	 * The CPUs this group covers.
  	 *
  	 * NOTE: this field is variable length. (Allocated dynamically
  	 * by attaching extra space to the end of the structure,
  	 * depending on how many CPUs the kernel has booted up with)

  	 */
  	unsigned long cpumask[0];

  };

  static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
  {

  	return to_cpumask(sg->cpumask);

  }

  /**
   * group_first_cpu - Returns the first cpu in the cpumask of a sched_group.
   * @group: The group whose first cpu is to be returned.
   */
  static inline unsigned int group_first_cpu(struct sched_group *group)
  {
  	return cpumask_first(sched_group_cpus(group));
  }

  struct sched_domain_attr {
  	int relax_domain_level;
  };
  
  #define SD_ATTR_INIT	(struct sched_domain_attr) {	\
  	.relax_domain_level = -1,			\
  }

  extern int sched_domain_level_max;

  struct sched_domain {
  	/* These fields must be setup */
  	struct sched_domain *parent;	/* top domain must be null terminated */

  	struct sched_domain *child;	/* bottom domain must be null terminated */

  	struct sched_group *groups;	/* the balancing groups of the domain */

  	unsigned long min_interval;	/* Minimum balance interval ms */
  	unsigned long max_interval;	/* Maximum balance interval ms */
  	unsigned int busy_factor;	/* less balancing by factor if busy */
  	unsigned int imbalance_pct;	/* No balance until over watermark */

  	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */

  	unsigned int busy_idx;
  	unsigned int idle_idx;
  	unsigned int newidle_idx;
  	unsigned int wake_idx;

  	unsigned int forkexec_idx;

  	unsigned int smt_gain;

  	int flags;			/* See SD_* */

  	int level;

  
  	/* Runtime fields. */
  	unsigned long last_balance;	/* init to jiffies. units in jiffies */
  	unsigned int balance_interval;	/* initialise to 1. units in ms. */
  	unsigned int nr_balance_failed; /* initialise to 0 */

  	u64 last_update;

  #ifdef CONFIG_SCHEDSTATS
  	/* load_balance() stats */

  	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
  	unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];

  
  	/* Active load balancing */

  	unsigned int alb_count;
  	unsigned int alb_failed;
  	unsigned int alb_pushed;

  	/* SD_BALANCE_EXEC stats */

  	unsigned int sbe_count;
  	unsigned int sbe_balanced;
  	unsigned int sbe_pushed;

  	/* SD_BALANCE_FORK stats */

  	unsigned int sbf_count;
  	unsigned int sbf_balanced;
  	unsigned int sbf_pushed;

  	/* try_to_wake_up() stats */

  	unsigned int ttwu_wake_remote;
  	unsigned int ttwu_move_affine;
  	unsigned int ttwu_move_balance;

  #endif

  #ifdef CONFIG_SCHED_DEBUG
  	char *name;
  #endif

  	union {
  		void *private;		/* used during construction */
  		struct rcu_head rcu;	/* used during destruction */
  	};

  	unsigned int span_weight;

  	/*
  	 * Span of all CPUs in this domain.
  	 *
  	 * NOTE: this field is variable length. (Allocated dynamically
  	 * by attaching extra space to the end of the structure,
  	 * depending on how many CPUs the kernel has booted up with)

  	 */
  	unsigned long span[0];

  };

  static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
  {

  	return to_cpumask(sd->span);

  }

  extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],

  				    struct sched_domain_attr *dattr_new);

  /* Allocate an array of sched domains, for partition_sched_domains(). */
  cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
  void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);

  /* Test a flag in parent sched domain */
  static inline int test_sd_parent(struct sched_domain *sd, int flag)
  {
  	if (sd->parent && (sd->parent->flags & flag))
  		return 1;
  
  	return 0;
  }

  unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu);
  unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu);

  #else /* CONFIG_SMP */

  struct sched_domain_attr;

  static inline void

  partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],

  			struct sched_domain_attr *dattr_new)
  {

  }

  #endif	/* !CONFIG_SMP */

  struct io_context;			/* See blkdev.h */

  #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK

  extern void prefetch_stack(struct task_struct *t);

  #else
  static inline void prefetch_stack(struct task_struct *t) { }
  #endif

  
  struct audit_context;		/* See audit.c */
  struct mempolicy;

  struct pipe_inode_info;

  struct uts_namespace;

  struct rq;
  struct sched_domain;

  /*
   * wake flags
   */
  #define WF_SYNC		0x01		/* waker goes to sleep after wakup */

  #define WF_FORK		0x02		/* child wakeup after fork */

  #define WF_MIGRATED	0x04		/* internal use, task got migrated */

  #define ENQUEUE_WAKEUP		1

  #define ENQUEUE_HEAD		2
  #ifdef CONFIG_SMP
  #define ENQUEUE_WAKING		4	/* sched_class::task_waking was called */
  #else
  #define ENQUEUE_WAKING		0
  #endif

  
  #define DEQUEUE_SLEEP		1

  struct sched_class {

  	const struct sched_class *next;

  	void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
  	void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);

  	void (*yield_task) (struct rq *rq);

  	bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt);

  	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags);

  	struct task_struct * (*pick_next_task) (struct rq *rq);

  	void (*put_prev_task) (struct rq *rq, struct task_struct *p);

  #ifdef CONFIG_SMP

  	int  (*select_task_rq)(struct task_struct *p, int sd_flag, int flags);

  	void (*pre_schedule) (struct rq *this_rq, struct task_struct *task);
  	void (*post_schedule) (struct rq *this_rq);

  	void (*task_waking) (struct task_struct *task);

  	void (*task_woken) (struct rq *this_rq, struct task_struct *task);

  	void (*set_cpus_allowed)(struct task_struct *p,

  				 const struct cpumask *newmask);

  	void (*rq_online)(struct rq *rq);
  	void (*rq_offline)(struct rq *rq);

  #endif
  
  	void (*set_curr_task) (struct rq *rq);
  	void (*task_tick) (struct rq *rq, struct task_struct *p, int queued);

  	void (*task_fork) (struct task_struct *p);

  	void (*switched_from) (struct rq *this_rq, struct task_struct *task);
  	void (*switched_to) (struct rq *this_rq, struct task_struct *task);

  	void (*prio_changed) (struct rq *this_rq, struct task_struct *task,

  			     int oldprio);

  	unsigned int (*get_rr_interval) (struct rq *rq,
  					 struct task_struct *task);

  #ifdef CONFIG_FAIR_GROUP_SCHED

  	void (*task_move_group) (struct task_struct *p, int on_rq);

  #endif

  };
  
  struct load_weight {
  	unsigned long weight, inv_weight;
  };

  #ifdef CONFIG_SCHEDSTATS

  struct sched_statistics {

  	u64			wait_start;

  	u64			wait_max;

  	u64			wait_count;
  	u64			wait_sum;

  	u64			iowait_count;
  	u64			iowait_sum;

  	u64			sleep_start;

  	u64			sleep_max;

  	s64			sum_sleep_runtime;
  
  	u64			block_start;

  	u64			block_max;
  	u64			exec_max;

  	u64			slice_max;

  	u64			nr_migrations_cold;
  	u64			nr_failed_migrations_affine;
  	u64			nr_failed_migrations_running;
  	u64			nr_failed_migrations_hot;
  	u64			nr_forced_migrations;

  
  	u64			nr_wakeups;
  	u64			nr_wakeups_sync;
  	u64			nr_wakeups_migrate;
  	u64			nr_wakeups_local;
  	u64			nr_wakeups_remote;
  	u64			nr_wakeups_affine;
  	u64			nr_wakeups_affine_attempts;
  	u64			nr_wakeups_passive;
  	u64			nr_wakeups_idle;

  };
  #endif
  
  struct sched_entity {
  	struct load_weight	load;		/* for load-balancing */
  	struct rb_node		run_node;
  	struct list_head	group_node;
  	unsigned int		on_rq;
  
  	u64			exec_start;
  	u64			sum_exec_runtime;
  	u64			vruntime;
  	u64			prev_sum_exec_runtime;

  	u64			nr_migrations;

  #ifdef CONFIG_SCHEDSTATS
  	struct sched_statistics statistics;

  #endif

  #ifdef CONFIG_FAIR_GROUP_SCHED
  	struct sched_entity	*parent;
  	/* rq on which this entity is (to be) queued: */
  	struct cfs_rq		*cfs_rq;
  	/* rq "owned" by this entity/group: */
  	struct cfs_rq		*my_q;
  #endif
  };

  struct sched_rt_entity {
  	struct list_head run_list;

  	unsigned long timeout;

  	unsigned int time_slice;

  	int nr_cpus_allowed;

  	struct sched_rt_entity *back;

  #ifdef CONFIG_RT_GROUP_SCHED

  	struct sched_rt_entity	*parent;
  	/* rq on which this entity is (to be) queued: */
  	struct rt_rq		*rt_rq;
  	/* rq "owned" by this entity/group: */
  	struct rt_rq		*my_q;
  #endif

  };

  struct rcu_node;

  enum perf_event_task_context {
  	perf_invalid_context = -1,
  	perf_hw_context = 0,

  	perf_sw_context,

  	perf_nr_task_contexts,
  };

  struct task_struct {
  	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */

  	void *stack;

  	atomic_t usage;

  	unsigned int flags;	/* per process flags, defined below */
  	unsigned int ptrace;

  #ifdef CONFIG_SMP

  	struct llist_node wake_entry;

  	int on_cpu;

  #endif

  	int on_rq;

  	int prio, static_prio, normal_prio;

  	unsigned int rt_priority;

  	const struct sched_class *sched_class;

  	struct sched_entity se;

  	struct sched_rt_entity rt;

  #ifdef CONFIG_PREEMPT_NOTIFIERS
  	/* list of struct preempt_notifier: */
  	struct hlist_head preempt_notifiers;
  #endif

  	/*
  	 * fpu_counter contains the number of consecutive context switches
  	 * that the FPU is used. If this is over a threshold, the lazy fpu
  	 * saving becomes unlazy to save the trap. This is an unsigned char
  	 * so that after 256 times the counter wraps and the behavior turns
  	 * lazy again; this to deal with bursty apps that only use FPU for
  	 * a short time
  	 */
  	unsigned char fpu_counter;

  #ifdef CONFIG_BLK_DEV_IO_TRACE

  	unsigned int btrace_seq;

  #endif

  	unsigned int policy;

  	cpumask_t cpus_allowed;

  #ifdef CONFIG_PREEMPT_RCU

  	int rcu_read_lock_nesting;

  	char rcu_read_unlock_special;

  	struct list_head rcu_node_entry;

  #endif /* #ifdef CONFIG_PREEMPT_RCU */
  #ifdef CONFIG_TREE_PREEMPT_RCU
  	struct rcu_node *rcu_blocked_node;

  #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */

  #ifdef CONFIG_RCU_BOOST
  	struct rt_mutex *rcu_boost_mutex;
  #endif /* #ifdef CONFIG_RCU_BOOST */

  #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)

  	struct sched_info sched_info;
  #endif
  
  	struct list_head tasks;

  #ifdef CONFIG_SMP

  	struct plist_node pushable_tasks;

  #endif

  
  	struct mm_struct *mm, *active_mm;

  #ifdef CONFIG_COMPAT_BRK
  	unsigned brk_randomized:1;
  #endif

  #if defined(SPLIT_RSS_COUNTING)
  	struct task_rss_stat	rss_stat;
  #endif

  /* task state */

  	int exit_state;

  	int exit_code, exit_signal;
  	int pdeath_signal;  /*  The signal sent when the parent dies  */

  	unsigned int jobctl;	/* JOBCTL_*, siglock protected */

  	/* ??? */

  	unsigned int personality;

  	unsigned did_exec:1;

  	unsigned in_execve:1;	/* Tell the LSMs that the process is doing an
  				 * execve */

  	unsigned in_iowait:1;

  
  	/* Revert to default priority/policy when forking */
  	unsigned sched_reset_on_fork:1;

  	unsigned sched_contributes_to_load:1;

  	pid_t pid;
  	pid_t tgid;

  #ifdef CONFIG_CC_STACKPROTECTOR

  	/* Canary value for the -fstack-protector gcc feature */
  	unsigned long stack_canary;

  #endif

  	/* 
  	 * pointers to (original) parent process, youngest child, younger sibling,
  	 * older sibling, respectively.  (p->father can be replaced with 

  	 * p->real_parent->pid)

  	 */

  	struct task_struct __rcu *real_parent; /* real parent process */
  	struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */

  	/*

  	 * children/sibling forms the list of my natural children

  	 */
  	struct list_head children;	/* list of my children */
  	struct list_head sibling;	/* linkage in my parent's children list */
  	struct task_struct *group_leader;	/* threadgroup leader */

  	/*
  	 * ptraced is the list of tasks this task is using ptrace on.
  	 * This includes both natural children and PTRACE_ATTACH targets.
  	 * p->ptrace_entry is p's link on the p->parent->ptraced list.
  	 */
  	struct list_head ptraced;
  	struct list_head ptrace_entry;

  	/* PID/PID hash table linkage. */

  	struct pid_link pids[PIDTYPE_MAX];

  	struct list_head thread_group;

  
  	struct completion *vfork_done;		/* for vfork() */
  	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
  	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */

  	cputime_t utime, stime, utimescaled, stimescaled;

  	cputime_t gtime;

  #ifndef CONFIG_VIRT_CPU_ACCOUNTING

  	cputime_t prev_utime, prev_stime;

  #endif

  	unsigned long nvcsw, nivcsw; /* context switch counts */

  	struct timespec start_time; 		/* monotonic time */
  	struct timespec real_start_time;	/* boot based time */

  /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
  	unsigned long min_flt, maj_flt;

  	struct task_cputime cputime_expires;

  	struct list_head cpu_timers[3];
  
  /* process credentials */

  	const struct cred __rcu *real_cred; /* objective and real subjective task

  					 * credentials (COW) */

  	const struct cred __rcu *cred;	/* effective (overridable) subjective task

  					 * credentials (COW) */

  	struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */

  	char comm[TASK_COMM_LEN]; /* executable name excluding path
  				     - access with [gs]et_task_comm (which lock
  				       it with task_lock())

  				     - initialized normally by setup_new_exec */

  /* file system info */
  	int link_count, total_link_count;

  #ifdef CONFIG_SYSVIPC

  /* ipc stuff */
  	struct sysv_sem sysvsem;

  #endif

  #ifdef CONFIG_DETECT_HUNG_TASK

  /* hung task detection */

  	unsigned long last_switch_count;
  #endif

  /* CPU-specific state of this task */
  	struct thread_struct thread;
  /* filesystem information */
  	struct fs_struct *fs;
  /* open file information */
  	struct files_struct *files;

  /* namespaces */

  	struct nsproxy *nsproxy;

  /* signal handlers */
  	struct signal_struct *signal;
  	struct sighand_struct *sighand;
  
  	sigset_t blocked, real_blocked;

  	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */

  	struct sigpending pending;
  
  	unsigned long sas_ss_sp;
  	size_t sas_ss_size;
  	int (*notifier)(void *priv);
  	void *notifier_data;
  	sigset_t *notifier_mask;

  	struct audit_context *audit_context;

  #ifdef CONFIG_AUDITSYSCALL
  	uid_t loginuid;

  	unsigned int sessionid;

  #endif

  	seccomp_t seccomp;
  
  /* Thread group tracking */
     	u32 parent_exec_id;
     	u32 self_exec_id;

  /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
   * mempolicy */

  	spinlock_t alloc_lock;

  #ifdef CONFIG_GENERIC_HARDIRQS
  	/* IRQ handler threads */
  	struct irqaction *irqaction;
  #endif

  	/* Protection of the PI data structures: */

  	raw_spinlock_t pi_lock;

  #ifdef CONFIG_RT_MUTEXES
  	/* PI waiters blocked on a rt_mutex held by this task */
  	struct plist_head pi_waiters;
  	/* Deadlock detection and priority inheritance handling */
  	struct rt_mutex_waiter *pi_blocked_on;

  #endif

  #ifdef CONFIG_DEBUG_MUTEXES
  	/* mutex deadlock detection */
  	struct mutex_waiter *blocked_on;
  #endif

  #ifdef CONFIG_TRACE_IRQFLAGS
  	unsigned int irq_events;

  	unsigned long hardirq_enable_ip;

  	unsigned long hardirq_disable_ip;

  	unsigned int hardirq_enable_event;

  	unsigned int hardirq_disable_event;

  	int hardirqs_enabled;
  	int hardirq_context;

  	unsigned long softirq_disable_ip;

  	unsigned long softirq_enable_ip;

  	unsigned int softirq_disable_event;

  	unsigned int softirq_enable_event;

  	int softirqs_enabled;

  	int softirq_context;
  #endif

  #ifdef CONFIG_LOCKDEP

  # define MAX_LOCK_DEPTH 48UL

  	u64 curr_chain_key;
  	int lockdep_depth;

  	unsigned int lockdep_recursion;

  	struct held_lock held_locks[MAX_LOCK_DEPTH];

  	gfp_t lockdep_reclaim_gfp;

  #endif

  /* journalling filesystem info */
  	void *journal_info;

  /* stacked block device info */

  	struct bio_list *bio_list;

  #ifdef CONFIG_BLOCK
  /* stack plugging */
  	struct blk_plug *plug;
  #endif

  /* VM state */
  	struct reclaim_state *reclaim_state;

  	struct backing_dev_info *backing_dev_info;
  
  	struct io_context *io_context;
  
  	unsigned long ptrace_message;
  	siginfo_t *last_siginfo; /* For ptrace use.  */

  	struct task_io_accounting ioac;

  #if defined(CONFIG_TASK_XACCT)

  	u64 acct_rss_mem1;	/* accumulated rss usage */
  	u64 acct_vm_mem1;	/* accumulated virtual memory usage */

  	cputime_t acct_timexpd;	/* stime + utime since last update */

  #endif
  #ifdef CONFIG_CPUSETS

  	nodemask_t mems_allowed;	/* Protected by alloc_lock */

  	int mems_allowed_change_disable;