cregit-Linux how code gets into the kernel

Release 4.12 include/linux/sched.h

Directory: include/linux
#ifndef _LINUX_SCHED_H

#define _LINUX_SCHED_H

/*
 * Define 'struct task_struct' and provide the main scheduler
 * APIs (schedule(), wakeup variants, etc.)
 */

#include <uapi/linux/sched.h>

#include <asm/current.h>

#include <linux/pid.h>
#include <linux/sem.h>
#include <linux/shm.h>
#include <linux/kcov.h>
#include <linux/mutex.h>
#include <linux/plist.h>
#include <linux/hrtimer.h>
#include <linux/seccomp.h>
#include <linux/nodemask.h>
#include <linux/rcupdate.h>
#include <linux/resource.h>
#include <linux/latencytop.h>
#include <linux/sched/prio.h>
#include <linux/signal_types.h>
#include <linux/mm_types_task.h>
#include <linux/task_io_accounting.h>

/* task_struct member predeclarations (sorted alphabetically): */
struct audit_context;
struct backing_dev_info;
struct bio_list;
struct blk_plug;
struct cfs_rq;
struct fs_struct;
struct futex_pi_state;
struct io_context;
struct mempolicy;
struct nameidata;
struct nsproxy;
struct perf_event_context;
struct pid_namespace;
struct pipe_inode_info;
struct rcu_node;
struct reclaim_state;
struct robust_list_head;
struct sched_attr;
struct sched_param;
struct seq_file;
struct sighand_struct;
struct signal_struct;
struct task_delay_info;
struct task_group;

/*
 * 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.
 */

/* Used in tsk->state: */

#define TASK_RUNNING			0

#define TASK_INTERRUPTIBLE		1

#define TASK_UNINTERRUPTIBLE		2

#define __TASK_STOPPED			4

#define __TASK_TRACED			8
/* Used in tsk->exit_state: */

#define EXIT_DEAD			16

#define EXIT_ZOMBIE			32

#define EXIT_TRACE			(EXIT_ZOMBIE | EXIT_DEAD)
/* Used in tsk->state again: */

#define TASK_DEAD			64

#define TASK_WAKEKILL			128

#define TASK_WAKING			256

#define TASK_PARKED			512

#define TASK_NOLOAD			1024

#define TASK_NEW			2048

#define TASK_STATE_MAX			4096


#define TASK_STATE_TO_CHAR_STR		"RSDTtXZxKWPNn"

/* Convenience macros for the sake of set_current_state: */

#define TASK_KILLABLE			(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)

#define TASK_STOPPED			(TASK_WAKEKILL | __TASK_STOPPED)

#define TASK_TRACED			(TASK_WAKEKILL | __TASK_TRACED)


#define TASK_IDLE			(TASK_UNINTERRUPTIBLE | TASK_NOLOAD)

/* 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 | EXIT_ZOMBIE | EXIT_DEAD)


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


#define task_is_stopped(task)		((task->state & __TASK_STOPPED) != 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 && \
                                         (task->state & TASK_NOLOAD) == 0)

#ifdef CONFIG_DEBUG_ATOMIC_SLEEP


#define __set_current_state(state_value)			\
	do {                                                    \
                current->task_state_change = _THIS_IP_;         \
                current->state = (state_value);                 \
        } while (0)

#define set_current_state(state_value)				\
	do {                                                    \
                current->task_state_change = _THIS_IP_;         \
                smp_store_mb(current->state, (state_value));    \
        } while (0)

#else
/*
 * 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:
 *
 *   for (;;) {
 *      set_current_state(TASK_UNINTERRUPTIBLE);
 *      if (!need_sleep)
 *              break;
 *
 *      schedule();
 *   }
 *   __set_current_state(TASK_RUNNING);
 *
 * If the caller does not need such serialisation (because, for instance, the
 * condition test and condition change and wakeup are under the same lock) then
 * use __set_current_state().
 *
 * The above is typically ordered against the wakeup, which does:
 *
 *      need_sleep = false;
 *      wake_up_state(p, TASK_UNINTERRUPTIBLE);
 *
 * Where wake_up_state() (and all other wakeup primitives) imply enough
 * barriers to order the store of the variable against wakeup.
 *
 * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is,
 * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a
 * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING).
 *
 * This is obviously fine, since they both store the exact same value.
 *
 * Also see the comments of try_to_wake_up().
 */

#define __set_current_state(state_value) do { current->state = (state_value); } while (0)

#define set_current_state(state_value)	 smp_store_mb(current->state, (state_value))
#endif

/* Task command name length: */

#define TASK_COMM_LEN			16

extern cpumask_var_t			cpu_isolated_map;

extern void scheduler_tick(void);


#define	MAX_SCHEDULE_TIMEOUT		LONG_MAX

extern long schedule_timeout(long timeout);
extern long schedule_timeout_interruptible(long timeout);
extern long schedule_timeout_killable(long timeout);
extern long schedule_timeout_uninterruptible(long timeout);
extern long schedule_timeout_idle(long timeout);
asmlinkage void schedule(void);
extern void schedule_preempt_disabled(void);

extern int __must_check io_schedule_prepare(void);
extern void io_schedule_finish(int token);
extern long io_schedule_timeout(long timeout);
extern void io_schedule(void);

/**
 * struct prev_cputime - snapshot of system and user cputime
 * @utime: time spent in user mode
 * @stime: time spent in system mode
 * @lock: protects the above two fields
 *
 * Stores previous user/system time values such that we can guarantee
 * monotonicity.
 */

struct prev_cputime {
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	
u64				utime;
	
u64				stime;
	
raw_spinlock_t			lock;
#endif
};

/**
 * struct task_cputime - collected CPU time counts
 * @utime:              time spent in user mode, in nanoseconds
 * @stime:              time spent in kernel mode, in nanoseconds
 * @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 {
	
u64				utime;
	
u64				stime;
	
unsigned long long		sum_exec_runtime;
};

/* Alternate field names when used on cache expirations: */

#define virt_exp			utime

#define prof_exp			stime

#define sched_exp			sum_exec_runtime


struct sched_info {
#ifdef CONFIG_SCHED_INFO
	/* Cumulative counters: */

	/* # of times we have run on this CPU: */
	
unsigned long			pcount;

	/* Time spent waiting on a runqueue: */
	
unsigned long long		run_delay;

	/* Timestamps: */

	/* When did we last run on a CPU? */
	
unsigned long long		last_arrival;

	/* When were we last queued to run? */
	
unsigned long long		last_queued;

#endif /* CONFIG_SCHED_INFO */
};

/*
 * Integer metrics need fixed point arithmetic, e.g., sched/fair
 * has a few: load, load_avg, util_avg, freq, and capacity.
 *
 * We define a basic fixed point arithmetic range, and then formalize
 * all these metrics based on that basic range.
 */

# define SCHED_FIXEDPOINT_SHIFT		10

# define SCHED_FIXEDPOINT_SCALE		(1L << SCHED_FIXEDPOINT_SHIFT)


struct load_weight {
	
unsigned long			weight;
	
u32				inv_weight;
};

/*
 * The load_avg/util_avg accumulates an infinite geometric series
 * (see __update_load_avg() in kernel/sched/fair.c).
 *
 * [load_avg definition]
 *
 *   load_avg = runnable% * scale_load_down(load)
 *
 * where runnable% is the time ratio that a sched_entity is runnable.
 * For cfs_rq, it is the aggregated load_avg of all runnable and
 * blocked sched_entities.
 *
 * load_avg may also take frequency scaling into account:
 *
 *   load_avg = runnable% * scale_load_down(load) * freq%
 *
 * where freq% is the CPU frequency normalized to the highest frequency.
 *
 * [util_avg definition]
 *
 *   util_avg = running% * SCHED_CAPACITY_SCALE
 *
 * where running% is the time ratio that a sched_entity is running on
 * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
 * and blocked sched_entities.
 *
 * util_avg may also factor frequency scaling and CPU capacity scaling:
 *
 *   util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
 *
 * where freq% is the same as above, and capacity% is the CPU capacity
 * normalized to the greatest capacity (due to uarch differences, etc).
 *
 * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
 * themselves are in the range of [0, 1]. To do fixed point arithmetics,
 * we therefore scale them to as large a range as necessary. This is for
 * example reflected by util_avg's SCHED_CAPACITY_SCALE.
 *
 * [Overflow issue]
 *
 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
 * with the highest load (=88761), always runnable on a single cfs_rq,
 * and should not overflow as the number already hits PID_MAX_LIMIT.
 *
 * For all other cases (including 32-bit kernels), struct load_weight's
 * weight will overflow first before we do, because:
 *
 *    Max(load_avg) <= Max(load.weight)
 *
 * Then it is the load_weight's responsibility to consider overflow
 * issues.
 */

struct sched_avg {
	
u64				last_update_time;
	
u64				load_sum;
	
u32				util_sum;
	
u32				period_contrib;
	
unsigned long			load_avg;
	
unsigned long			util_avg;
};


struct sched_statistics {
#ifdef CONFIG_SCHEDSTATS
	
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 {
	/* For load-balancing: */
	
struct load_weight		load;
	
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;

	
struct sched_statistics		statistics;

#ifdef CONFIG_FAIR_GROUP_SCHED
	
int				depth;
	
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

#ifdef CONFIG_SMP
	/*
         * Per entity load average tracking.
         *
         * Put into separate cache line so it does not
         * collide with read-mostly values above.
         */
	
struct sched_avg		avg ____cacheline_aligned_in_smp;
#endif
};


struct sched_rt_entity {
	
struct list_head		run_list;
	
unsigned long			timeout;
	
unsigned long			watchdog_stamp;
	
unsigned int			time_slice;
	
unsigned short			on_rq;
	
unsigned short			on_list;

	
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 sched_dl_entity {
	
struct rb_node			rb_node;

	/*
         * Original scheduling parameters. Copied here from sched_attr
         * during sched_setattr(), they will remain the same until
         * the next sched_setattr().
         */
	
u64				dl_runtime;	/* Maximum runtime for each instance    */
	
u64				dl_deadline;	/* Relative deadline of each instance   */
	
u64				dl_period;	/* Separation of two instances (period) */
	
u64				dl_bw;		/* dl_runtime / dl_deadline             */

	/*
         * Actual scheduling parameters. Initialized with the values above,
         * they are continously updated during task execution. Note that
         * the remaining runtime could be < 0 in case we are in overrun.
         */
	
s64				runtime;	/* Remaining runtime for this instance  */
	
u64				deadline;	/* Absolute deadline for this instance  */
	
unsigned int			flags;		/* Specifying the scheduler behaviour   */

	/*
         * Some bool flags:
         *
         * @dl_throttled tells if we exhausted the runtime. If so, the
         * task has to wait for a replenishment to be performed at the
         * next firing of dl_timer.
         *
         * @dl_boosted tells if we are boosted due to DI. If so we are
         * outside bandwidth enforcement mechanism (but only until we
         * exit the critical section);
         *
         * @dl_yielded tells if task gave up the CPU before consuming
         * all its available runtime during the last job.
         */
	
int				dl_throttled;
	
int				dl_boosted;
	
int				dl_yielded;

	/*
         * Bandwidth enforcement timer. Each -deadline task has its
         * own bandwidth to be enforced, thus we need one timer per task.
         */
	
struct hrtimer			dl_timer;
};


union rcu_special {
	struct {
		
u8			blocked;
		
u8			need_qs;
		
u8			exp_need_qs;

		/* Otherwise the compiler can store garbage here: */
		
u8			pad;
	
} b; /* Bits. */
	
u32 s; /* Set of bits. */
};


enum perf_event_task_context {
	
perf_invalid_context = -1,
	
perf_hw_context = 0,
	
perf_sw_context,
	
perf_nr_task_contexts,
};


struct wake_q_node {
	
struct wake_q_node *next;
};


struct task_struct {
#ifdef CONFIG_THREAD_INFO_IN_TASK
	/*
         * For reasons of header soup (see current_thread_info()), this
         * must be the first element of task_struct.
         */
	
struct thread_info		thread_info;
#endif
	/* -1 unrunnable, 0 runnable, >0 stopped: */
	
volatile long			state;
	
void				*stack;
	
atomic_t			usage;
	/* Per task flags (PF_*), defined further below: */
	
unsigned int			flags;
	
unsigned int			ptrace;

#ifdef CONFIG_SMP
	
struct llist_node		wake_entry;
	
int				on_cpu;
#ifdef CONFIG_THREAD_INFO_IN_TASK
	/* Current CPU: */
	
unsigned int			cpu;
#endif
	
unsigned int			wakee_flips;
	
unsigned long			wakee_flip_decay_ts;
	
struct task_struct		*last_wakee;

	
int				wake_cpu;
#endif
	
int				on_rq;

	
int				prio;
	
int				static_prio;
	
int				normal_prio;
	
unsigned int			rt_priority;

	
const struct sched_class	*sched_class;
	
struct sched_entity		se;
	
struct sched_rt_entity		rt;
#ifdef CONFIG_CGROUP_SCHED
	
struct task_group		*sched_task_group;
#endif
	
struct sched_dl_entity		dl;

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

#ifdef CONFIG_BLK_DEV_IO_TRACE
	
unsigned int			btrace_seq;
#endif

	
unsigned int			policy;
	
int				nr_cpus_allowed;
	
cpumask_t			cpus_allowed;

#ifdef CONFIG_PREEMPT_RCU
	
int				rcu_read_lock_nesting;
	
union rcu_special		rcu_read_unlock_special;
	
struct list_head		rcu_node_entry;
	
struct rcu_node			*rcu_blocked_node;
#endif /* #ifdef CONFIG_PREEMPT_RCU */

#ifdef CONFIG_TASKS_RCU
	
unsigned long			rcu_tasks_nvcsw;
	
bool				rcu_tasks_holdout;
	
struct list_head		rcu_tasks_holdout_list;
	
int				rcu_tasks_idle_cpu;
#endif /* #ifdef CONFIG_TASKS_RCU */

	
struct sched_info		sched_info;

	
struct list_head		tasks;
#ifdef CONFIG_SMP
	
struct plist_node		pushable_tasks;
	
struct rb_node			pushable_dl_tasks;
#endif

	
struct mm_struct		*mm;
	
struct mm_struct		*active_mm;

	/* Per-thread vma caching: */
	
struct vmacache			vmacache;

#ifdef SPLIT_RSS_COUNTING
	
struct task_rss_stat		rss_stat;
#endif
	
int				exit_state;
	
int				exit_code;
	
int				exit_signal;
	/* The signal sent when the parent dies: */
	
int				pdeath_signal;
	/* JOBCTL_*, siglock protected: */
	
unsigned long			jobctl;

	/* Used for emulating ABI behavior of previous Linux versions: */
	
unsigned int			personality;

	/* Scheduler bits, serialized by scheduler locks: */
	
unsigned			sched_reset_on_fork:1;
	
unsigned			sched_contributes_to_load:1;
	
unsigned			sched_migrated:1;
	
unsigned			sched_remote_wakeup:1;
	/* Force alignment to the next boundary: */
	unsigned			:0;

	/* Unserialized, strictly 'current' */

	/* Bit to tell LSMs we're in execve(): */
	
unsigned			in_execve:1;
	
unsigned			in_iowait:1;
#ifndef TIF_RESTORE_SIGMASK
	
unsigned			restore_sigmask:1;
#endif
#ifdef CONFIG_MEMCG
	
unsigned			memcg_may_oom:1;
#ifndef CONFIG_SLOB
	
unsigned			memcg_kmem_skip_account:1;
#endif
#endif
#ifdef CONFIG_COMPAT_BRK
	
unsigned			brk_randomized:1;
#endif
#ifdef CONFIG_CGROUPS
	/* disallow userland-initiated cgroup migration */
	
unsigned			no_cgroup_migration:1;
#endif

	
unsigned long			atomic_flags; /* Flags requiring atomic access. */

	
struct restart_block		restart_block;

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

	/* Real parent process: */
	
struct task_struct __rcu	*real_parent;

	/* Recipient of SIGCHLD, wait4() reports: */
	
struct task_struct __rcu	*parent;

	/*
         * Children/sibling form the list of natural children:
         */
	
struct list_head		children;
	
struct list_head		sibling;
	
struct task_struct		*group_leader;

	/*
         * 'ptraced' is the list of tasks this task is using ptrace() on.
         *
         * This includes both natural children and PTRACE_ATTACH targets.
         * 'ptrace_entry' is this task'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 list_head		thread_node;

	
struct completion		*vfork_done;

	/* CLONE_CHILD_SETTID: */
	
int __user			*set_child_tid;

	/* CLONE_CHILD_CLEARTID: */
	
int __user			*clear_child_tid;

	
u64				utime;
	
u64				stime;
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
	
u64				utimescaled;
	
u64				stimescaled;
#endif
	
u64				gtime;
	
struct prev_cputime		prev_cputime;
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
	
seqcount_t			vtime_seqcount;
	
unsigned long long		vtime_snap;
	enum {
		/* Task is sleeping or running in a CPU with VTIME inactive: */
		
VTIME_INACTIVE = 0,
		/* Task runs in userspace in a CPU with VTIME active: */
		
VTIME_USER,
		/* Task runs in kernelspace in a CPU with VTIME active: */
		
VTIME_SYS,
        } 
vtime_snap_whence;
#endif

#ifdef CONFIG_NO_HZ_FULL
	
atomic_t			tick_dep_mask;
#endif
	/* Context switch counts: */
	
unsigned long			nvcsw;
	
unsigned long			nivcsw;

	/* Monotonic time in nsecs: */
	
u64				start_time;

	/* Boot based time in nsecs: */
	
u64				real_start_time;

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

#ifdef CONFIG_POSIX_TIMERS
	
struct task_cputime		cputime_expires;
	
struct list_head		cpu_timers[3];
#endif

	/* Process credentials: */

	/* Tracer's credentials at attach: */
	
const struct cred __rcu		*ptracer_cred;

	/* Objective and real subjective task credentials (COW): */
	
const struct cred __rcu		*real_cred;

	/* Effective (overridable) subjective task credentials (COW): */
	
const struct cred __rcu		*cred;

	/*
         * executable name, excluding path.
         *
         * - normally initialized setup_new_exec()
         * - access it with [gs]et_task_comm()
         * - lock it with task_lock()
         */
	
char				comm[TASK_COMM_LEN];

	
struct nameidata		*nameidata;

#ifdef CONFIG_SYSVIPC
	
struct sysv_sem			sysvsem;
	
struct sysv_shm			sysvshm;
#endif
#ifdef CONFIG_DETECT_HUNG_TASK
	
unsigned long			last_switch_count;
#endif
	/* 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;
	
sigset_t			real_blocked;
	/* Restored if set_restore_sigmask() was used: */
	
sigset_t			saved_sigmask;
	
struct sigpending		pending;
	
unsigned long			sas_ss_sp;
	
size_t				sas_ss_size;
	
unsigned int			sas_ss_flags;

	
struct callback_head		*task_works;

	
struct audit_context		*audit_context;
#ifdef CONFIG_AUDITSYSCALL
	
kuid_t				loginuid;
	
unsigned int			sessionid;
#endif
	
struct seccomp			seccomp;

	/* Thread group tracking: */
	
u32				parent_exec_id;
	
u32				self_exec_id;

	/* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */
	
spinlock_t			alloc_lock;

	/* Protection of the PI data structures: */
	
raw_spinlock_t			pi_lock;

	
struct wake_q_node		wake_q;

#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task: */
	
struct rb_root			pi_waiters;
	
struct rb_node			*pi_waiters_leftmost;
	/* Updated under owner's pi_lock and rq lock */
	
struct task_struct		*pi_top_task;
	/* 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

#ifdef CONFIG_UBSAN
	
unsigned int			in_ubsan;
#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;

	/* Ptrace state: */
	
unsigned long			ptrace_message;
	
siginfo_t			*last_siginfo;

	
struct task_io_accounting	ioac;
#ifdef CONFIG_TASK_XACCT
	/* Accumulated RSS usage: */
	
u64				acct_rss_mem1;
	/* Accumulated virtual memory usage: */
	
u64				acct_vm_mem1;
	/* stime + utime since last update: */
	
u64				acct_timexpd;
#endif
#ifdef CONFIG_CPUSETS
	/* Protected by ->alloc_lock: */
	
nodemask_t			mems_allowed;
	/* Seqence number to catch updates: */
	
seqcount_t			mems_allowed_seq;
	
int				cpuset_mem_spread_rotor;
	
int				cpuset_slab_spread_rotor;
#endif
#ifdef CONFIG_CGROUPS
	/* Control Group info protected by css_set_lock: */
	
struct css_set __rcu		*cgroups;
	/* cg_list protected by css_set_lock and tsk->alloc_lock: */
	
struct list_head		cg_list;
#endif
#ifdef CONFIG_INTEL_RDT_A
	
int				closid;
#endif
#ifdef CONFIG_FUTEX
	
struct robust_list_head __user	*robust_list;
#ifdef CONFIG_COMPAT
	
struct compat_robust_list_head __user *compat_robust_list;
#endif
	
struct list_head		pi_state_list;
	
struct futex_pi_state		*pi_state_cache;
#endif
#ifdef CONFIG_PERF_EVENTS
	
struct perf_event_context	*perf_event_ctxp[perf_nr_task_contexts];
	
struct mutex			perf_event_mutex;
	
struct list_head		perf_event_list;
#endif
#ifdef CONFIG_DEBUG_PREEMPT
	
unsigned long			preempt_disable_ip;
#endif
#ifdef CONFIG_NUMA
	/* Protected by alloc_lock: */
	
struct mempolicy		*mempolicy;
	
short				il_next;
	
short				pref_node_fork;
#endif
#ifdef CONFIG_NUMA_BALANCING
	
int				numa_scan_seq;
	
unsigned int			numa_scan_period;
	
unsigned int			numa_scan_period_max;
	
int				numa_preferred_nid;
	
unsigned long			numa_migrate_retry;
	/* Migration stamp: */
	
u64				node_stamp;
	
u64				last_task_numa_placement;
	
u64				last_sum_exec_runtime;
	
struct callback_head		numa_work;

	
struct list_head		numa_entry;
	
struct numa_group		*numa_group;

	/*
         * numa_faults is an array split into four regions:
         * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
         * in this precise order.
         *
         * faults_memory: Exponential decaying average of faults on a per-node
         * basis. Scheduling placement decisions are made based on these
         * counts. The values remain static for the duration of a PTE scan.
         * faults_cpu: Track the nodes the process was running on when a NUMA
         * hinting fault was incurred.
         * faults_memory_buffer and faults_cpu_buffer: Record faults per node
         * during the current scan window. When the scan completes, the counts
         * in faults_memory and faults_cpu decay and these values are copied.
         */
	
unsigned long			*numa_faults;
	
unsigned long			total_numa_faults;

	/*
         * numa_faults_locality tracks if faults recorded during the last
         * scan window were remote/local or failed to migrate. The task scan
         * period is adapted based on the locality of the faults with different
         * weights depending on whether they were shared or private faults
         */
	
unsigned long			numa_faults_locality[3];

	
unsigned long			numa_pages_migrated;
#endif /* CONFIG_NUMA_BALANCING */

	
struct tlbflush_unmap_batch	tlb_ubc;

	
struct rcu_head			rcu;

	/* Cache last used pipe for splice(): */
	
struct pipe_inode_info		*splice_pipe;

	
struct page_frag		task_frag;

#ifdef CONFIG_TASK_DELAY_ACCT
	
struct task_delay_info		*delays;
#endif

#ifdef CONFIG_FAULT_INJECTION
	
int				make_it_fail;
#endif
	/*
         * When (nr_dirtied >= nr_dirtied_pause), it's time to call
         * balance_dirty_pages() for a dirty throttling pause:
         */
	
int				nr_dirtied;
	
int				nr_dirtied_pause;
	/* Start of a write-and-pause period: */
	
unsigned long			dirty_paused_when;

#ifdef CONFIG_LATENCYTOP
	
int				latency_record_count;
	
struct latency_record		latency_record[LT_SAVECOUNT];
#endif
	/*
         * Time slack values; these are used to round up poll() and
         * select() etc timeout values. These are in nanoseconds.
         */
	
u64				timer_slack_ns;
	
u64				default_timer_slack_ns;

#ifdef CONFIG_KASAN
	
unsigned int			kasan_depth;
#endif

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	/* Index of current stored address in ret_stack: */
	
int				curr_ret_stack;

	/* Stack of return addresses for return function tracing: */
	
struct ftrace_ret_stack		*ret_stack;

	/* Timestamp for last schedule: */
	
unsigned long long		ftrace_timestamp;

	/*
         * Number of functions that haven't been traced
         * because of depth overrun:
         */
	
atomic_t			trace_overrun;

	/* Pause tracing: */
	
atomic_t			tracing_graph_pause;
#endif

#ifdef CONFIG_TRACING
	/* State flags for use by tracers: */
	
unsigned long			trace;

	/* Bitmask and counter of trace recursion: */
	
unsigned long			trace_recursion;
#endif /* CONFIG_TRACING */

#ifdef CONFIG_KCOV
	/* Coverage collection mode enabled for this task (0 if disabled): */
	
enum kcov_mode			kcov_mode;

	/* Size of the kcov_area: */
	
unsigned int			kcov_size;

	/* Buffer for coverage collection: */
	
void				*kcov_area;

	/* KCOV descriptor wired with this task or NULL: */
	
struct kcov			*kcov;
#endif

#ifdef CONFIG_MEMCG
	
struct mem_cgroup		*memcg_in_oom;
	
gfp_t				memcg_oom_gfp_mask;
	
int				memcg_oom_order;

	/* Number of pages to reclaim on returning to userland: */
	
unsigned int			memcg_nr_pages_over_high;
#endif

#ifdef CONFIG_UPROBES
	
struct uprobe_task		*utask;
#endif
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
	
unsigned int			sequential_io;
	
unsigned int			sequential_io_avg;
#endif
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
	
unsigned long			task_state_change;
#endif
	
int				pagefault_disabled;
#ifdef CONFIG_MMU
	
struct task_struct		*oom_reaper_list;
#endif
#ifdef CONFIG_VMAP_STACK
	
struct vm_struct		*stack_vm_area;
#endif
#ifdef CONFIG_THREAD_INFO_IN_TASK
	/* A live task holds one reference: */
	
atomic_t			stack_refcount;
#endif
#ifdef CONFIG_LIVEPATCH
	
int patch_state;
#endif
#ifdef CONFIG_SECURITY
	/* Used by LSM modules for access restriction: */
	
void				*security;
#endif
	/* CPU-specific state of this task: */
	
struct thread_struct		thread;

	/*
         * WARNING: on x86, 'thread_struct' contains a variable-sized
         * structure.  It *MUST* be at the end of 'task_struct'.
         *
         * Do not put anything below here!
         */
};




static inline struct pid *task_pid(struct task_struct *task)
{
	return task->pids[PIDTYPE_PID].pid;
}


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static inline struct pid *task_tgid(struct task_struct *task)
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}


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/*
 * Without tasklist or RCU lock it is not safe to dereference
 * the result of task_pgrp/task_session even if task == current,
 * we can race with another thread doing sys_setsid/sys_setpgid.
 */



static inline struct pid *task_pgrp(struct task_struct *task)
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}


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static inline struct pid *task_session(struct task_struct *task)
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}


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/*
 * the helpers to get the task's different pids as they are seen
 * from various namespaces
 *
 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
 * task_xid_nr_ns()  : id seen from the ns specified;
 *
 * set_task_vxid()   : assigns a virtual id to a task;
 *
 * see also pid_nr() etc in include/linux/pid.h
 */
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns);




static inline pid_t task_pid_nr(struct task_struct *tsk)
{
	return tsk->pid;
}


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static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
}


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static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
}



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static inline pid_t task_tgid_nr(struct task_struct *tsk)
{
	return tsk->tgid;
}


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extern pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);




static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_tgid(tsk));
}


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/**
 * pid_alive - check that a task structure is not stale
 * @p: Task structure to be checked.
 *
 * Test if a process is not yet dead (at most zombie state)
 * If pid_alive fails, then pointers within the task structure
 * can be stale and must not be dereferenced.
 *
 * Return: 1 if the process is alive. 0 otherwise.
 */



static inline int pid_alive(const struct task_struct *p)
{
	return p->pids[PIDTYPE_PID].pid != NULL;
}


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static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
{
	pid_t pid = 0;

	rcu_read_lock();
	if (pid_alive(tsk))
		pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
	rcu_read_unlock();

	return pid;
}


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static inline pid_t task_ppid_nr(const struct task_struct *tsk)
{
	return task_ppid_nr_ns(tsk, &init_pid_ns);
}


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static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
}


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static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
}



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static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
}


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static inline pid_t task_session_vnr(struct task_struct *tsk)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
}


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/* Obsolete, do not use: */



static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
	return task_pgrp_nr_ns(tsk, &init_pid_ns);
}


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/**
 * is_global_init - check if a task structure is init. Since init
 * is free to have sub-threads we need to check tgid.
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
 *
 * Return: 1 if the task structure is init. 0 otherwise.
 */



static inline int is_global_init(struct task_struct *tsk)
{
	return task_tgid_nr(tsk) == 1;
}


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extern struct pid *cad_pid;

/*
 * Per process flags
 */

#define PF_IDLE			0x00000002	
/* I am an IDLE thread */

#define PF_EXITING		0x00000004	
/* Getting shut down */

#define PF_EXITPIDONE		0x00000008	
/* PI exit done on shut down */

#define PF_VCPU			0x00000010	
/* I'm a virtual CPU */

#define PF_WQ_WORKER		0x00000020	
/* I'm a workqueue worker */

#define PF_FORKNOEXEC		0x00000040	
/* Forked but didn't exec */

#define PF_MCE_PROCESS		0x00000080      
/* Process policy on mce errors */

#define PF_SUPERPRIV		0x00000100	
/* Used super-user privileges */

#define PF_DUMPCORE		0x00000200	
/* Dumped core */

#define PF_SIGNALED		0x00000400	
/* Killed by a signal */

#define PF_MEMALLOC		0x00000800	
/* Allocating memory */

#define PF_NPROC_EXCEEDED	0x00001000	
/* set_user() noticed that RLIMIT_NPROC was exceeded */

#define PF_USED_MATH		0x00002000	
/* If unset the fpu must be initialized before use */

#define PF_USED_ASYNC		0x00004000	
/* Used async_schedule*(), used by module init */

#define PF_NOFREEZE		0x00008000	
/* This thread should not be frozen */

#define PF_FROZEN		0x00010000	
/* Frozen for system suspend */

#define PF_KSWAPD		0x00020000	
/* I am kswapd */

#define PF_MEMALLOC_NOFS	0x00040000	
/* All allocation requests will inherit GFP_NOFS */

#define PF_MEMALLOC_NOIO	0x00080000	
/* All allocation requests will inherit GFP_NOIO */

#define PF_LESS_THROTTLE	0x00100000	
/* Throttle me less: I clean memory */

#define PF_KTHREAD		0x00200000	
/* I am a kernel thread */

#define PF_RANDOMIZE		0x00400000	
/* Randomize virtual address space */

#define PF_SWAPWRITE		0x00800000	
/* Allowed to write to swap */

#define PF_NO_SETAFFINITY	0x04000000	
/* Userland is not allowed to meddle with cpus_allowed */

#define PF_MCE_EARLY		0x08000000      
/* Early kill for mce process policy */

#define PF_MUTEX_TESTER		0x20000000	
/* Thread belongs to the rt mutex tester */

#define PF_FREEZER_SKIP		0x40000000	
/* Freezer should not count it as freezable */

#define PF_SUSPEND_TASK		0x80000000      
/* This thread called freeze_processes() and should not be frozen */

/*
 * Only the _current_ task can read/write to tsk->flags, but other
 * tasks can access tsk->flags in readonly mode for example
 * with tsk_used_math (like during threaded core dumping).
 * There is however an exception to this rule during ptrace
 * or during fork: the ptracer task is allowed to write to the
 * child->flags of its traced child (same goes for fork, the parent
 * can write to the child->flags), because we're guaranteed the
 * child is not running and in turn not changing child->flags
 * at the same time the parent does it.
 */

#define clear_stopped_child_used_math(child)	do { (child)->flags &= ~PF_USED_MATH; } while (0)

#define set_stopped_child_used_math(child)	do { (child)->flags |= PF_USED_MATH; } while (0)

#define clear_used_math()			clear_stopped_child_used_math(current)

#define set_used_math()				set_stopped_child_used_math(current)


#define conditional_stopped_child_used_math(condition, child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)


#define conditional_used_math(condition)	conditional_stopped_child_used_math(condition, current)


#define copy_to_stopped_child_used_math(child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)

/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */

#define tsk_used_math(p)			((p)->flags & PF_USED_MATH)

#define used_math()				tsk_used_math(current)

/* Per-process atomic flags. */

#define PFA_NO_NEW_PRIVS		0	
/* May not gain new privileges. */

#define PFA_SPREAD_PAGE			1	
/* Spread page cache over cpuset */

#define PFA_SPREAD_SLAB			2	
/* Spread some slab caches over cpuset */



#define TASK_PFA_TEST(name, func)					\
	static inline bool task_##func(struct task_struct *p)           \
        { return test_bit(PFA_##name, &p->atomic_flags); }


#define TASK_PFA_SET(name, func)					\
	static inline void task_set_##func(struct task_struct *p)       \
        { set_bit(PFA_##name, &p->atomic_flags); }


#define TASK_PFA_CLEAR(name, func)					\
	static inline void task_clear_##func(struct task_struct *p)     \
        { clear_bit(PFA_##name, &p->atomic_flags); }

TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)

TASK_PFA_TEST(SPREAD_PAGE, spread_page)
TASK_PFA_SET(SPREAD_PAGE, spread_page)
TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)

TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
TASK_PFA_SET(SPREAD_SLAB, spread_slab)
TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)



static inline void

current_restore_flags(unsigned long orig_flags, unsigned long flags)
{
	current->flags &= ~flags;
	current->flags |= orig_flags & flags;
}


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extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed);
#ifdef CONFIG_SMP
extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask);
extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask);
#else



static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
}

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static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
{
	if (!cpumask_test_cpu(0, new_mask))
		return -EINVAL;
	return 0;
}

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#endif

#ifndef cpu_relax_yield

#define cpu_relax_yield() cpu_relax()
#endif

extern int yield_to(struct task_struct *p, bool preempt);
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);

/**
 * task_nice - return the nice value of a given task.
 * @p: the task in question.
 *
 * Return: The nice value [ -20 ... 0 ... 19 ].
 */



static inline int task_nice(const struct task_struct *p)
{
	return PRIO_TO_NICE((p)->static_prio);
}


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extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
extern int idle_cpu(int cpu);
extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *);
extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *);
extern int sched_setattr(struct task_struct *, const struct sched_attr *);
extern struct task_struct *idle_task(int cpu);

/**
 * is_idle_task - is the specified task an idle task?
 * @p: the task in question.
 *
 * Return: 1 if @p is an idle task. 0 otherwise.
 */



static inline bool is_idle_task(const struct task_struct *p)
{
	return !!(p->flags & PF_IDLE);
}


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extern struct task_struct *curr_task(int cpu);
extern void ia64_set_curr_task(int cpu, struct task_struct *p);

void yield(void);


union thread_union {
#ifndef CONFIG_THREAD_INFO_IN_TASK
	
struct thread_info thread_info;
#endif
	
unsigned long stack[THREAD_SIZE/sizeof(long)];
};

#ifdef CONFIG_THREAD_INFO_IN_TASK



static inline struct thread_info *task_thread_info(struct task_struct *task)
{
	return &task->thread_info;
}

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#elif !defined(__HAVE_THREAD_FUNCTIONS)

# define task_thread_info(task)	((struct thread_info *)(task)->stack)
#endif

/*
 * find a task by one of its numerical ids
 *
 * find_task_by_pid_ns():
 *      finds a task by its pid in the specified namespace
 * find_task_by_vpid():
 *      finds a task by its virtual pid
 *
 * see also find_vpid() etc in include/linux/pid.h
 */

extern struct task_struct *find_task_by_vpid(pid_t nr);
extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns);

extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
extern void wake_up_new_task(struct task_struct *tsk);

#ifdef CONFIG_SMP
extern void kick_process(struct task_struct *tsk);
#else



static inline void kick_process(struct task_struct *tsk) { }

Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar11100.00%1100.00%


Total11100.00%1100.00%



#endif

extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);




static inline void set_task_comm(struct task_struct *tsk, const char *from)
{
	__set_task_comm(tsk, from, false);
}


Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar2076.92%150.00%


Jim Houston623.08%150.00%


Total26100.00%2100.00%



extern char *get_task_comm(char *to, struct task_struct *tsk);

#ifdef CONFIG_SMP
void scheduler_ipi(void);
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
#else



static inline void scheduler_ipi(void) { }

Contributors
PersonTokensPropCommitsCommitProp
Oleg Nesterov450.00%150.00%


Ingo Molnar450.00%150.00%


Total8100.00%2100.00%






static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state)
{
	return 1;
}

Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar1894.74%375.00%


Kirill Korotaev15.26%125.00%


Total19100.00%4100.00%



#endif

/*
 * Set thread flags in other task's structures.
 * See asm/thread_info.h for TIF_xxxx flags available:
 */



static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
	set_ti_thread_flag(task_thread_info(tsk), flag);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells2288.00%150.00%


Al Viro312.00%150.00%


Total25100.00%2100.00%






static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
	clear_ti_thread_flag(task_thread_info(tsk), flag);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells2288.00%150.00%


Al Viro312.00%150.00%


Total25100.00%2100.00%






static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells2388.46%150.00%


Al Viro311.54%150.00%


Total26100.00%2100.00%






static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells2388.46%150.00%


Al Viro311.54%150.00%


Total26100.00%2100.00%






static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
{
	return test_ti_thread_flag(task_thread_info(tsk), flag);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells2388.46%150.00%


Al Viro311.54%150.00%


Total26100.00%2100.00%






static inline void set_tsk_need_resched(struct task_struct *tsk)
{
	set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells19100.00%1100.00%


Total19100.00%1100.00%






static inline void clear_tsk_need_resched(struct task_struct *tsk)
{
	clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}


Contributors
PersonTokensPropCommitsCommitProp
David Howells19100.00%1100.00%


Total19100.00%1100.00%






static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}


Contributors
PersonTokensPropCommitsCommitProp
Gregory Haskins23100.00%1100.00%


Total23100.00%1100.00%



/*
 * cond_resched() and cond_resched_lock(): latency reduction via
 * explicit rescheduling in places that are safe. The return
 * value indicates whether a reschedule was done in fact.
 * cond_resched_lock() will drop the spinlock before scheduling,
 * cond_resched_softirq() will enable bhs before scheduling.
 */
#ifndef CONFIG_PREEMPT
extern int _cond_resched(void);
#else



static inline int _cond_resched(void) { return 0; }

Contributors
PersonTokensPropCommitsCommitProp
Peter Zijlstra12100.00%1100.00%


Total12100.00%1100.00%



#endif


#define cond_resched() ({                      \
        ___might_sleep(__FILE__, __LINE__, 0);  \
        _cond_resched();                        \
})

extern int __cond_resched_lock(spinlock_t *lock);


#define cond_resched_lock(lock) ({                              \
        ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
        __cond_resched_lock(lock);                              \
})

extern int __cond_resched_softirq(void);


#define cond_resched_softirq() ({                                      \
        ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);     \
        __cond_resched_softirq();                                       \
})




static inline void cond_resched_rcu(void)
{
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
	rcu_read_unlock();
	cond_resched();
	rcu_read_lock();
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Simon Horman32100.00%1100.00%


Total32100.00%1100.00%



/*
 * Does a critical section need to be broken due to another
 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
 */



static inline int spin_needbreak(spinlock_t *lock)
{
#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
	return 0;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton1244.44%133.33%


Nicholas Piggin1037.04%133.33%


Ingo Molnar518.52%133.33%


Total27100.00%3100.00%






static __always_inline bool need_resched(void)
{
	return unlikely(tif_need_resched());
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Zijlstra16100.00%1100.00%


Total16100.00%1100.00%



/*
 * Wrappers for p->thread_info->cpu access. No-op on UP.
 */
#ifdef CONFIG_SMP




static inline unsigned int task_cpu(const struct task_struct *p)
{
#ifdef CONFIG_THREAD_INFO_IN_TASK
	return p->cpu;
#else
	return task_thread_info(p)->cpu;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar1852.94%125.00%


Andrew Lutomirski1235.29%125.00%


Al Viro38.82%125.00%


Keith Owens12.94%125.00%


Total34100.00%4100.00%



extern void set_task_cpu(struct task_struct *p, unsigned int cpu);

#else




static inline unsigned int task_cpu(const struct task_struct *p)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar1694.12%150.00%


Keith Owens15.88%150.00%


Total17100.00%2100.00%






static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
{
}


Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar15100.00%1100.00%


Total15100.00%1100.00%



#endif /* CONFIG_SMP */

/*
 * In order to reduce various lock holder preemption latencies provide an
 * interface to see if a vCPU is currently running or not.
 *
 * This allows us to terminate optimistic spin loops and block, analogous to
 * the native optimistic spin heuristic of testing if the lock owner task is
 * running or not.
 */
#ifndef vcpu_is_preempted

# define vcpu_is_preempted(cpu)	false
#endif

extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);

#ifndef TASK_SIZE_OF

#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
Ingo Molnar83820.35%5211.21%


Peter Zijlstra3067.43%439.27%


Linus Torvalds (pre-git)2145.20%449.48%


Pavel Emelyanov1984.81%51.08%


David Howells1874.54%71.51%


Oleg Nesterov1132.74%91.94%


Eric W. Biedermann1122.72%51.08%


Andrew Morton892.16%224.74%


Paul E. McKenney872.11%112.37%


Richard Guy Briggs862.09%20.43%


Frédéric Weisbecker842.04%143.02%


Li Zefan811.97%30.65%


Andrew Lutomirski741.80%51.08%


Linus Torvalds711.72%153.23%


Andrea Arcangeli691.68%20.43%


Matthew Wilcox641.55%30.65%


Dario Faggioli621.51%51.08%


Tejun Heo541.31%102.16%


Mel Gorman511.24%81.72%


Arjan van de Ven441.07%61.29%


Lucas De Marchi411.00%10.22%


Juri Lelli380.92%40.86%


Rusty Russell370.90%40.86%


Motohiro Kosaki350.85%20.43%


Simon Horman320.78%10.22%


Al Viro320.78%61.29%


Keith Owens310.75%30.65%


Thomas Gleixner290.70%81.72%


Harvey Harrison280.68%10.22%


Richard Kennedy280.68%20.43%


Gregory Haskins270.66%20.43%


Frank Mayhar250.61%10.22%


Neil Brown250.61%40.86%


Jens Axboe240.58%40.86%


Dmitriy Vyukov230.56%10.22%


Anton Blanchard210.51%10.22%


Kent Overstreet210.51%10.22%


Roland McGrath210.51%30.65%


Dean Nelson210.51%10.22%


Nicholas Piggin200.49%40.86%


Steven Rostedt190.46%30.65%


Rik Van Riel190.46%40.86%


Yuyang Du190.46%30.65%


Mike Galbraith190.46%30.65%


Kees Cook190.46%20.43%


Andrey Ryabinin180.44%20.43%


David Woodhouse180.44%20.43%


Hiroshi Shimamoto180.44%20.43%


Dongsheng Yang170.41%20.43%


Alexey Dobriyan170.41%40.86%


Dave Hansen160.39%20.43%


Johannes Weiner160.39%40.86%


Rick Lindsley160.39%10.22%


Nishanth Aravamudan160.39%10.22%


Paul Turner140.34%20.43%


Paul Menage140.34%20.43%


Michal Hocko130.32%20.43%


Pan Xinhui130.32%10.22%


Matt Mackall130.32%10.22%


Serge E. Hallyn130.32%20.43%


Paul Jackson130.32%30.65%


Jim Houston120.29%10.22%


Kamezawa Hiroyuki110.27%20.43%


Vladimir Davydov110.27%20.43%


Christian Bornträger100.24%10.22%


Fengguang Wu100.24%20.43%


Shailabh Nagar100.24%10.22%


Akinobu Mita90.22%20.43%


Andi Kleen90.22%10.22%


Avi Kivity90.22%10.22%


Fenghua Yu80.19%10.22%


Josh Poimboeuf80.19%10.22%


Srikar Dronamraju80.19%10.22%


Daniel Jacobowitz80.19%20.43%


Mike Travis80.19%20.43%


Tetsuo Handa80.19%10.22%


Michael Wang70.17%10.22%


Jay Lan70.17%20.43%


Eric Dumazet70.17%20.43%


Laurent Vivier70.17%20.43%


Xunlei Pang60.15%10.22%


Jack Miller60.15%10.22%


Cédric Le Goater60.15%10.22%


Stanislaw Gruszka60.15%10.22%


Prasanna Meda50.12%10.22%


William Cohen50.12%10.22%


Balbir Singh50.12%10.22%


Pavel Machek50.12%10.22%


Nico Pitre50.12%10.22%


Ying Xue40.10%10.22%


Lennart Poettering40.10%10.22%


Colin Cross40.10%10.22%


Eric Paris40.10%10.22%


Christoph Lameter40.10%10.22%


Rafael J. Wysocki40.10%10.22%


Vasiliy Kulikov40.10%10.22%


Alexey Kuznetsov40.10%10.22%


Ming Lei40.10%10.22%


Sergey Senozhatsky40.10%10.22%


Kentaro Takeda40.10%10.22%


Harald Gustafsson30.07%10.22%


Jack Steiner30.07%10.22%


Christoph Hellwig30.07%20.43%


Davidlohr Bueso A30.07%10.22%


Paul Mackerras30.07%10.22%


David Rientjes30.07%10.22%


Arnd Bergmann30.07%20.43%


Stas Sergeev30.07%10.22%


David Hildenbrand30.07%10.22%


Chandra Seetharaman20.05%10.22%


Roman Zippel20.05%10.22%


Hugh Dickins20.05%10.22%


Michael Neuling20.05%10.22%


Will Drewry20.05%10.22%


Vincent Guittot20.05%10.22%


Alex Shi20.05%10.22%


Iulia Manda20.05%10.22%


Jiri Pirko20.05%10.22%


Dave Olien20.05%10.22%


Srivatsa Vaddagiri20.05%10.22%


Markus Metzger20.05%20.43%


Tomas Janousek20.05%10.22%


Tony Luck20.05%10.22%


Peter Williams20.05%10.22%


John Stultz20.05%10.22%


Jiri Olsa20.05%10.22%


Pranith Kumar10.02%10.22%


Mandeep Singh Baines10.02%10.22%


Kirill Korotaev10.02%10.22%


Herbert Xu10.02%10.22%


Masanari Iida10.02%10.22%


Miao Xie10.02%10.22%


Yacine Belkadi10.02%10.22%


Dan Carpenter10.02%10.22%


Martin Schwidefsky10.02%10.22%


Naveen N. Rao10.02%10.22%


Palmer Dabbelt10.02%10.22%


Jonathan Lim10.02%10.22%


xiaofeng.yan10.02%10.22%


David S. Miller10.02%10.22%


Ken Chen0.00%00.00%


Total4118100.00%464100.00%


Directory: include/linux



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