kernel学习之task_struct

程序和进程：

程序是存放在磁盘上的一系列代码和数据的可执行镜像，是一个静态的实体；

进程是一个执行的程序，它是动态的实体，它除了包含指令段，数据段等静态数据外（数据是可以是动态变化的），还包括当前的状态信息，如临时数据堆栈信息，当前处理器的寄存器信息等动态信息。这些动态信息通常称为进程上下文。

从内核角度来看，进程是操作系统分配内存，cpu时间片等资源的最小单位。其中它用到的数据和信息大部分都是在动态变化的。在linux内核中进程上下文通常用task_struct来描述，进程切换负责保存当前进程的上下文，恢复合适进程的上下文到cpu和寄存器中。

进程和线程：

随着计算机产业的发展，计算机的应用范围越来越广，计算机要解决的范围从处理器密集型的科学计算向IO密集型的用户交互式程序。为了解决日益复杂的问题。人们提出了分而治之（divide and comquer）的思想，也就是提出了进程。随着计算机的发展和对此技术的研究，人们发现，进程间的切换带来了相当大的系统开销（overload），人们又提出了线程的概念。线程是对进程的进一步抽象。一个进程有两部分组成：线程集合和资源集合。线程是进程中的一个动态对象，一组动态的指令流。进程中的所有线程将共享进程的中的资源，但每个线程又有独立的程序计数器，堆栈和寄存器。

linux中线程、进程都是用struct task_struct来描述。进程描述符task_struct用来刻画进程的状态属性，是内核操作和维护进程状态的唯一手段,其定义在linux 2.6.xx/include/linux/sched.h中。这个结构体相当的大

truct task_struct {  
    /*这个是进程的运行时状态，-1代表不可运行，0代表可运行，>0代表已停止*/
    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;  
      
    int lock_depth;     /* BKL lock depth */
      
#ifdef CONFIG_SMP  
#ifdef __ARCH_WANT_UNLOCKED_CTXSW  
    int oncpu;  
#endif  
#endif  
      
    int prio, static_prio, normal_prio;  
    /*表示此进程的运行优先级*/
    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  
      
    /* 查看本栏目更多精彩内容：http://www.bianceng.cn/OS/unix/
     * 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 */  
      
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)  
    struct sched_info sched_info;  
#endif  
      
    struct list_head tasks;  
    struct plist_node pushable_tasks;  
    /*该结构体记录了进程内存使用的相关情况*/
    struct mm_struct *mm, *active_mm;  
#if defined(SPLIT_RSS_COUNTING)  
    struct task_rss_stat    rss_stat;  
#endif  
/* task state */
    /*进程退出时的状态*/
    int exit_state;  
    int exit_code, exit_signal;  
    int pdeath_signal;  /*  The signal sent when the parent dies  */
    /* ??? */
    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;  
      
    /*进程号*/
    pid_t pid;  
    /*组进程号*/
    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) 
     */
     /*创建该进程的父进程*/
    struct task_struct *real_parent; /* real parent process */
    /*parent是该进程现在的父进程，有可能是”继父“*/
    struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */
    /* 
     * children/sibling forms the list of my natural children 
     */
     /*这里children指的是该进程孩子的链表，可以得到所有孩子的进程描述符*/
    struct list_head children;  /* list of my children */
    /*sibling该进程兄弟的链表，也就是其父亲的所有孩子的链表*/
    struct list_head sibling;   /* linkage in my parent's children list */
    /*这个是主线程的进程描述符，linux并没有单独实现线程的相关结构体，只是用一个进程来代替线程，然后对其做一些特殊的处理*/
    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];  
    /*该进程所有线程的链表*/
    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 */
      
    /*这个是该进程使用cpu时间的信息，utime是在用户态下执行的时间，stime是在内核态下执行的时间*/
    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 */
    /*启动的时间，只是时间基准不一样*/
    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 */
      
    /*保存该进程名字的字符数组*/
    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 */
/* 文件系统信息计数*/
    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 */
/*该进程在特定CPU下的状态*/
    struct thread_struct thread;  
/* filesystem information */
/* 文件系统相关信息结构体*/
    struct fs_struct *fs;  
/* open file information */
/* 打开的文件相关信息结构体,对驱动开发者来说此结构会常见到*/
    struct files_struct *files;  
/* namespaces */
    struct nsproxy *nsproxy;  
/* signal handlers */
/* 信号相关信息的句柄*/
    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;  
      
/* 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;  
    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_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_NUMA  
    struct mempolicy *mempolicy;    /* Protected by alloc_lock */
    short il_next;  
#endif  
    atomic_t fs_excl;   /* holding fs exclusive resources */
    struct rcu_head rcu;  
      
    /* 
     * cache last used pipe for splice 
     */
    struct pipe_inode_info *splice_pipe;  
#ifdef  CONFIG_TASK_DELAY_ACCT  
    struct task_delay_info *delays;  
#endif  
#ifdef CONFIG_FAULT_INJECTION  
    int make_it_fail;  
#endif  
    struct prop_local_single dirties;  
#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. 
     */
     /*这些是松弛时间值，用来规定select()和poll()的超时时间，单位是纳秒nanoseconds  */
    unsigned long timer_slack_ns;  
    unsigned long default_timer_slack_ns;  
      
    struct list_head    *scm_work_list;  
#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 long long 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 of trace recursion */
    unsigned long trace_recursion;  
#endif /* CONFIG_TRACING */  
#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* 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 bytes;        /* uncharged usage */
        unsigned long memsw_bytes; /* uncharged mem+swap usage */
    } memcg_batch;  
#endif  
};

上面只是一些简单注释，后面会重点介绍某些重要的结构体，和它们的相关操作和用途。

Author：csdn博客 muge0913

（编辑：佛山站长网）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!