【一】 sched.h
第一个数据结构体是 task_struct ，这个数据结构被内核用来表示进程，包含其所有信息。
定义于文件 include/linux/sched.h 中，先看看其完整定义
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_CGROUP_SCHED
struct 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_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:;
#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:;
unsigned in_execve:; /* Tell the LSMs that the process is doing an
* execve */
unsigned in_iowait:;
/* Revert to default priority/policy when forking */
unsigned sched_reset_on_fork:;
unsigned sched_contributes_to_load:;
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 */
#ifdef CONFIG_MTK_SCHED_CMP_TGS
raw_spinlock_t thread_group_info_lock;
struct thread_group_info_t thread_group_info[NUM_CLUSTER];
#endif
/*
* 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_NATIVE
struct cputime prev_cputime;
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
seqlock_t vtime_seqlock;
unsigned long long vtime_snap;
enum {
VTIME_SLEEPING = ,
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;
/* for thrashing accounting */
#ifdef CONFIG_ZRAM
unsigned long fm_flt, swap_in, swap_out;
#endif
struct task_cputime cputime_expires;
struct list_head cpu_timers[];
/* 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) */
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;
#endif
struct 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_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;
short pref_node_fork;
#endif
#ifdef CONFIG_NUMA_BALANCING
int 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_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 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_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.
*/
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 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 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;
struct memcg_oom_info {
struct mem_cgroup *memcg;
gfp_t gfp_mask;
int order;
unsigned int may_oom:;
} memcg_oom;
#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT
atomic_t ptrace_bp_refcnt;
#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
};
下面一个结构一个结构的看
1. volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */
当前进程的状态，由以下宏定义
/*
* 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_PARKED 512
#define TASK_STATE_MAX 1024
宏定义还包含了exit state的状态
还有以下组合宏，以方便使用
/* 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)
判断task状态的宏
#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)) != )
#define task_contributes_to_load(task) \
((task->state & TASK_UNINTERRUPTIBLE) != && \
(task->flags & PF_FROZEN) == )
设置task state的宏，分为mb顺序执行版本和读写内存操作乱序执行版本
#define __set_task_state(tsk, state_value) \
do { (tsk)->state = (state_value); } while ()
#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 ()
#define set_current_state(state_value) \
set_mb(current->state, (state_value))
task command名长度宏
/* Task command name length */
#define TASK_COMM_LEN 16
下边这两个不知道干什么用的
#define TASK_STATE_TO_CHAR_STR "RSDTtZXxKWP" extern char ___assert_task_state[ - *!!(
sizeof(TASK_STATE_TO_CHAR_STR)- != ilog2(TASK_STATE_MAX)+)];
2. void *stack;
指明进程stack地址
3. atomic_t usage;
fork里边用到，但暂时不知道作用
4. unsigned int flags; /* per process flags, defined below */
每个进程的flag，定义如下
/*
* Per process flags
*/
#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_FSTRANS 0x00020000 /* inside a filesystem transaction */
#define PF_KSWAPD 0x00040000 /* I am kswapd */
#define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */
#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_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
#define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
#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_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
#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_MTKPASR 0x80000000 /* I am in MTKPASR process */
下边的宏操作flag，mtk的定制flag和fpu的使用有关，包括了current和非current的
#define task_in_mtkpasr(task) unlikely(task->flags & PF_MTKPASR) /*
* 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 : ; } while ()
#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 ()
/* 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)
memory alloc no io相关的操作
/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
* __GFP_FS is also cleared as it implies __GFP_IO.
*/
static inline gfp_t memalloc_noio_flags(gfp_t flags)
{
if (unlikely(current->flags & PF_MEMALLOC_NOIO))
flags &= ~(__GFP_IO | __GFP_FS);
return flags;
} static inline unsigned int memalloc_noio_save(void)
{
unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
current->flags |= PF_MEMALLOC_NOIO;
return flags;
} static inline void memalloc_noio_restore(unsigned int flags)
{
current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
}
5. unsigned int ptrace;
跟ptrace相关，目前不知道怎么用
6.
#ifdef CONFIG_SMP
struct llist_node wake_entry;
被唤醒对象的linked list
7.
int on_cpu;
#endif
进程跑在哪个CPU上
8. int on_rq;
不清楚
9. 10. 11. int prio, static_prio, normal_prio;
进程的优先级
12. unsigned int rt_priority;
实时优先级
13. const struct sched_class *sched_class;
调度类别
14. struct sched_entity se;
调度实体
15. struct sched_rt_entity rt;
实时调度实体
16.
#ifdef CONFIG_CGROUP_SCHED
struct task_group *sched_task_group;
#endif
调度任务组
17.
#ifdef CONFIG_PREEMPT_NOTIFIERS
/* list of struct preempt_notifier: */
struct hlist_head preempt_notifiers;
#endif
抢占通知hlist，MTK没定义宏 CONFIG_PREEMPT_NOTIFIERS
18.
/*
* 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;
不清楚
19.
#ifdef CONFIG_BLK_DEV_IO_TRACE
unsigned int btrace_seq;
#endif
不清楚
20. unsigned int policy;
策略
21. int nr_cpus_allowed;
允许的CPU数量
22. cpumask_t cpus_allowed;
不清楚，类型 cpumask_t 要看
23.
#ifdef CONFIG_PREEMPT_RCU
int rcu_read_lock_nesting
rcu读锁的嵌套层数
24. 25.
char rcu_read_unlock_special;
struct list_head rcu_node_entry;
#endif /* #ifdef CONFIG_PREEMPT_RCU */
不清楚
26.
#ifdef CONFIG_TREE_PREEMPT_RCU
struct rcu_node *rcu_blocked_node;
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
不清楚
27.
#ifdef CONFIG_RCU_BOOST
struct rt_mutex *rcu_boost_mutex;
#endif /* #ifdef CONFIG_RCU_BOOST */
不清楚,MTK没定义宏 CONFIG_RCU_BOOST
28.
#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
struct sched_info sched_info;
#endif
调度信息，宏 CONFIG_SCHEDSTATS 和 CONFIG_TASK_DELAY_ACCT 未定义
29. struct list_head tasks;
tasks列表，不知道是否为子进程列表
30.
#ifdef CONFIG_SMP
struct plist_node pushable_tasks;
#endif
不清楚
31. 32 struct mm_struct *mm, *active_mm;
该进程内存管理的数据结构
33.
#ifdef CONFIG_COMPAT_BRK
unsigned brk_randomized:;
#endif
不清楚
34.
#if defined(SPLIT_RSS_COUNTING)
struct task_rss_stat rss_stat;
#endif
不清楚
35.
/* task state */
int exit_state;
进程退出时的状态
36. 37. int exit_code, exit_signal;
进程退出码和退出信号量
38. int pdeath_signal; /* The signal sent when the parent dies */
父进程死掉的信号量
39. unsigned int jobctl; /* JOBCTL_*, siglock protected */
job ctrl，信号锁保护
与之相关的宏定义如下
/*
* task->jobctl flags
*/
#define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */
#define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */
#define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */
#define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */
#define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */
#define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */
#define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT)
#define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT)
#define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT)
#define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT)
#define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT)
#define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT)
#define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
#define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
操作函数的声明如下，具体的实现位于 kernel/signal.c 文件中
extern bool task_set_jobctl_pending(struct task_struct *task,
unsigned int mask);
extern void task_clear_jobctl_trapping(struct task_struct *task);
extern void task_clear_jobctl_pending(struct task_struct *task,
unsigned int mask);
40.
/* Used for emulating ABI behavior of previous Linux versions */
unsigned int personality;
不清楚
41. unsigned did_exec:;
不清楚
42.
unsigned in_execve:; /* Tell the LSMs that the process is doing an
* execve */
进程在执行中
43. unsigned in_iowait:;
进程在IO等待中
44.
/* Revert to default priority/policy when forking */
unsigned sched_reset_on_fork:;
在fork的时候调度reset
45. unsigned sched_contributes_to_load:;
调度对负载的影响
46. unsigned long atomic_flags; /* Flags needing atomic access. */
需要原子操作的flag
下边为跟此flag有关的宏和函数
/* Per-process atomic flags. */
#define PFA_NO_NEW_PRIVS 0x00000001 /* May not gain new privileges. */ static inline bool task_no_new_privs(struct task_struct *p)
{
return test_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
} static inline void task_set_no_new_privs(struct task_struct *p)
{
set_bit(PFA_NO_NEW_PRIVS, &p->atomic_flags);
}
47. pid_t pid;
进程pid
48. pid_t tgid;
threadgroup id
49.
#ifdef CONFIG_CC_STACKPROTECTOR
/* Canary value for the -fstack-protector gcc feature */
unsigned long stack_canary;
#endif
栈金丝雀，防止栈被篡改，宏 CONFIG_CC_STACKPROTECTOR 未定义
50.
/*
* 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 */
真正的父进程
51. struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
不清楚
52.
/*
* children/sibling forms the list of my natural children
*/
struct list_head children; /* list of my children */
子进程的list
53. struct list_head sibling; /* linkage in my parent's children list */
兄弟姐妹的list
54. struct task_struct *group_leader; /* threadgroup leader */
thread group的leader
55. 56.
#ifdef CONFIG_MTK_SCHED_CMP_TGS
raw_spinlock_t thread_group_info_lock;
struct thread_group_info_t thread_group_info[NUM_CLUSTER];
#endif
不清楚，宏 CONFIG_MTK_SCHED_CMP_TGS 未定义
57. 58.
/*
* 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;
不清楚
59.
/* PID/PID hash table linkage. */
struct pid_link pids[PIDTYPE_MAX];
跟进程namespace相关，不清楚
60. struct list_head thread_group;
thread group
61. struct list_head thread_node;
不清楚
62. struct completion *vfork_done; /* for vfork() */
不清楚
63. struct completion *vfork_done; /* for vfork() */
vfork是否完成
64. 65.
int __user *set_child_tid; /* CLONE_CHILD_SETTID */
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */
不清楚
66. 67. 68. 69. 70.
cputime_t utime, stime, utimescaled, stimescaled;
cputime_t gtime;
不清楚
71.
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
struct cputime prev_cputime;
#endif
不清楚，宏 CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 未定义
72. 73.
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
seqlock_t vtime_seqlock;
unsigned long long vtime_snap;
enum {
VTIME_SLEEPING = ,
VTIME_USER,
VTIME_SYS,
} vtime_snap_whence;
#endif
不清楚，宏 CONFIG_VIRT_CPU_ACCOUNTING_GEN 未定义
74. 75.
unsigned long nvcsw, nivcsw; /* context switch counts */
不清楚
76. struct timespec start_time; /* monotonic time */
不清楚，单调时间不清楚
77. struct timespec real_start_time; /* boot based time */
真实启动时间
78. 79.
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
unsigned long min_flt, maj_flt;
不清楚
80. 81. 82.
/* for thrashing accounting */
#ifdef CONFIG_ZRAM
unsigned long fm_flt, swap_in, swap_out;
#endif
不清楚，宏 CONFIG_ZRAM 未定义
83. struct task_cputime cputime_expires;
cputime到期
84. struct list_head cpu_timers[];
不清楚
85. 86. 87.
/* 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) */
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 */
不清楚，什么是process credential
88. 89.
/* file system info */
int link_count, total_link_count;
link数和总共link数
90.
#ifdef CONFIG_SYSVIPC
/* ipc stuff */
struct sysv_sem sysvsem;
#endif
IPC相关，宏 CONFIG_SYSVIPC 未定义
91.
#ifdef CONFIG_DETECT_HUNG_TASK
/* hung task detection */
unsigned long last_switch_count;
#endif
task hung检测，宏 CONFIG_DETECT_HUNG_TASK 未定义
92.
/* CPU-specific state of this task */
struct thread_struct thread;
task跟cpu相关的状态
93.
/* filesystem information */
struct fs_struct *fs;
这个进程与之相关的文件系统
94.
/* open file information */
struct files_struct *files;
这个进程打开的文件
95.
/* namespaces */
struct nsproxy *nsproxy;
进程的namespace代理
96.
/* signal handlers */
struct signal_struct *signal;
进程的信号
97. struct sighand_struct *sighand;
signal handler
98. 99. 100. 101.
sigset_t blocked, real_blocked;
sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
struct sigpending pending;
不清楚
102.
unsigned long sas_ss_sp;
size_t sas_ss_size;
不清楚
103. 104. 105.
int (*notifier)(void *priv);
void *notifier_data;
sigset_t *notifier_mask;
notifier相关，不清楚具体通知什么
106. struct callback_head *task_works;
进程的回调队列
107. struct audit_context *audit_context;
不清楚
108.
#ifdef CONFIG_AUDITSYSCALL
kuid_t loginuid;
unsigned int sessionid;
#endif
不清楚，宏 CONFIG_AUDITSYSCALL 未定义
109. struct seccomp seccomp;
不清楚
110. 111.
/* Thread group tracking */
u32 parent_exec_id;
u32 self_exec_id;
thread group中parent和self的执行id
112.
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
* mempolicy */
spinlock_t alloc_lock;
mm、files、fs、tty、keyrings、mems_allowed、mempolicy分配的锁
113.
/* Protection of the PI data structures: */
raw_spinlock_t pi_lock;
pi data锁，不清楚pi是什么
114. 115.
#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
不清楚，宏 CONFIG_RT_MUTEXES 有定义
116.
#ifdef CONFIG_DEBUG_MUTEXES
/* mutex deadlock detection */
struct mutex_waiter *blocked_on;
#endif
不清楚，宏 CONFIG_DEBUG_MUTEXES 未定义
117. 118. 119. 120. 121. 122. 123. 124. 125. 126. 127. 128. 129.
#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
中断跟踪，包括总的中断数、hard和soft中断的enable、disable中断数，不清楚ip是什么意思
130. 131. 132. 133. 134.
#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
跟锁依赖有关，不清楚具体做什么
135.
/* journalling filesystem info */
void *journal_info;
文件系统的日志
136.
/* stacked block device info */
struct bio_list *bio_list;
被存入堆栈的block device io list
137.
#ifdef CONFIG_BLOCK
/* stack plugging */
struct blk_plug *plug;
#endif
block device的插拔
138.
/* VM state */
struct reclaim_state *reclaim_state;
不清楚
139. struct backing_dev_info *backing_dev_info;
不清楚
140. struct io_context *io_context;
进程的io context
141. unsigned long ptrace_message;
ptrace message
142. siginfo_t *last_siginfo; /* For ptrace use. */
最后的signal信息
143. struct task_io_accounting ioac;
task io计数
144. 145. 146.
#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
累积的rss memory、virtual memory、time话费，宏 CONFIG_TASK_XACCT 未定义
147. 148. 149. 150.
#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
不清楚，宏 CONFIG_CPUSETS 未定义
151. 152.
#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
css（cgroups subsys state)的cgroups和cgroup list
153. 154. 155. 156
#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
不清楚，宏 CONFIG_FUTEX 未定义
157. 158. 159.
#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
performance相关的event context数组、event mutex、event list
160. 161. 162.
#ifdef CONFIG_NUMA
struct mempolicy *mempolicy; /* Protected by alloc_lock */
short il_next;
short pref_node_fork;
#endif
不清楚，宏 CONFIG_NUMA （Non-uniform memory access ）未定义
163. 164. 165. 166. 167.
#ifdef CONFIG_NUMA_BALANCING
int 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 */
不清楚
168. struct rcu_head rcu;
read copy update头
169.
/*
* cache last used pipe for splice
*/
struct pipe_inode_info *splice_pipe;
不清楚
170.
/*
* cache last used pipe for splice
*/
struct pipe_inode_info *splice_pipe;
splice pipe的信息
171. struct page_frag task_frag;
task的page fragment
172.
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info *delays;
#endif
不清楚，宏 CONFIG_TASK_DELAY_ACCT 未定义
173.
#ifdef CONFIG_FAULT_INJECTION
int make_it_fail;
#endif
不清楚
174. 175. 176.
/*
* 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 */
dirty page相关
177. 178.
#ifdef CONFIG_LATENCYTOP
int latency_record_count;
struct latency_record latency_record[LT_SAVECOUNT];
#endif
不清楚，宏 CONFIG_LATENCYTOP 未定义
179. 180.
/*
* 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;
poll()和select()等的timeout值
181. 182. 183. 184. 185.
#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
ftrace的图形化跟踪变量，宏 CONFIG_FUNCTION_GRAPH_TRACER 未定义
186. 187.
#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 */
trace的flag和trace递归的数量和bitmask
188. 189. 190
#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;
struct memcg_oom_info {
struct mem_cgroup *memcg;
gfp_t gfp_mask;
int order;
unsigned int may_oom:;
} memcg_oom;
#endif
不清楚，宏 CONFIG_MEMCG 未定义
191.
#ifdef CONFIG_HAVE_HW_BREAKPOINT
atomic_t ptrace_bp_refcnt;
#endif
ptrace的断点引用数量
192.
#ifdef CONFIG_UPROBES
struct uprobe_task *utask;
#endif
不清楚，宏 CONFIG_UPROBES 未定义
193. 194.
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
unsigned int sequential_io;
unsigned int sequential_io_avg;
#endif
不清楚，宏 CONFIG_BCACHE 和 CONFIG_BCACHE 未定义
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