标识符
与进程相关的唯一标识符，用来区别正在执行的进程和其他进程。
状态
描述进程的状态，因为进程有挂起，阻塞，运行等好几个状态，所以都有个标识符来记录进程的执行状态。
优先级
如果有好几个进程正在执行，就涉及到进程被执行的先后顺序的问题，这和进程优先级这个标识符有关。
程序计数器
程序中即将被执行的下一条指令的地址。
内存指针
程序代码和进程相关数据的指针。
上下文数据
进程执行时处理器的寄存器中的数据。
I/O状态信息
包括显示的I/O请求，分配给进程的I/O设备和被进程使用的文件列表等。
记账信息
包括处理器的时间总和，记账号等等。
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_SMPstruct llist_node wake_entry;
int on_cpu;
#endifint on_rq;
int prio, static_prio, normal_prio;
unsigned int rt_priority;
conststruct sched_class *sched_class;
struct sched_entity se;
struct sched_rt_entity rt;
#ifdef CONFIG_CGROUP_SCHEDstruct task_group *sched_task_group;
#endif#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;
int nr_cpus_allowed;
cpumask_t cpus_allowed;
#ifdef CONFIG_PREEMPT_RCUint rcu_read_lock_nesting;
char rcu_read_unlock_special;
struct list_head rcu_node_entry;
#endif /* #ifdef CONFIG_PREEMPT_RCU */#ifdef CONFIG_TREE_PREEMPT_RCUstruct rcu_node *rcu_blocked_node;
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */#ifdef CONFIG_RCU_BOOSTstruct rt_mutex *rcu_boost_mutex;
#endif /* #ifdef CONFIG_RCU_BOOST */#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)struct sched_info sched_info;
#endifstruct list_head tasks;
#ifdef CONFIG_SMPstruct plist_node pushable_tasks;
#endifstruct 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 *//* Used for emulating ABI behavior of previous Linux versions */
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;
unsigned long atomic_flags; /* Flags needing atomic access. */
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 list_head thread_node;
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_NATIVEstruct cputime prev_cputime;
#endif#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
seqlock_t vtime_seqlock;
unsigned longlong vtime_snap;
enum {
VTIME_SLEEPING = 0,
VTIME_USER,
VTIME_SYS,
} vtime_snap_whence;
#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 */conststruct cred __rcu *real_cred; /* objective and real subjective task
* credentials (COW) */conststruct cred __rcu *cred; /* effective (overridable) subjective task
* credentials (COW) */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 callback_head *task_works;
struct audit_context *audit_context;
#ifdef CONFIG_AUDITSYSCALL
kuid_t loginuid;
unsigned int sessionid;
#endifstruct seccomp 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;
/* 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 */
seqcount_t mems_allowed_seq; /* Seqence no to catch updates */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_FUTEXstruct robust_list_head __user *robust_list;
#ifdef CONFIG_COMPATstruct compat_robust_list_head __user *compat_robust_list;
#endifstruct list_head pi_state_list;
struct futex_pi_state *pi_state_cache;
#endif#ifdef CONFIG_PERF_EVENTSstruct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
struct mutex perf_event_mutex;
struct list_head perf_event_list;
#endif#ifdef CONFIG_NUMAstruct mempolicy *mempolicy; /* Protected by alloc_lock */short il_next;
short pref_node_fork;
#endif#ifdef CONFIG_NUMA_BALANCINGint numa_scan_seq;
int numa_migrate_seq;
unsigned int numa_scan_period;
u64 node_stamp; /* migration stamp */struct callback_head numa_work;
#endif /* CONFIG_NUMA_BALANCING */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_ACCTstruct task_delay_info *delays;
#endif#ifdef CONFIG_FAULT_INJECTIONint make_it_fail;
#endif/*
* when (nr_dirtied >= nr_dirtied_pause), it's time to call
* balance_dirty_pages() for some dirty throttling pause
*/int nr_dirtied;
int nr_dirtied_pause;
unsigned long dirty_paused_when; /* start of a write-and-pause period */#ifdef CONFIG_LATENCYTOPint 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.
*/
unsigned long timer_slack_ns;
unsigned long default_timer_slack_ns;
#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;
/* time stamp for last schedule */
unsigned longlong ftrace_timestamp;
/*
* Number of functions that haven't been traced
* because of depth overrun.
*/
atomic_t trace_overrun;
/* Pause for the 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_MEMCG /* memcg uses this to do batch job */struct memcg_batch_info {
int do_batch; /* incremented when batch uncharge started */struct mem_cgroup *memcg; /* target memcg of uncharge */
unsigned long nr_pages; /* uncharged usage */
unsigned long memsw_nr_pages; /* uncharged mem+swap usage */
} memcg_batch;
unsigned int memcg_kmem_skip_account;
#endif#ifdef CONFIG_HAVE_HW_BREAKPOINT
atomic_t ptrace_bp_refcnt;
#endif#ifdef CONFIG_UPROBESstruct uprobe_task *utask;
#endif#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
unsigned int sequential_io;
unsigned int sequential_io_avg;
#endif
};
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