unsigned int flags; /* per process flags, defined below */#define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */ #define PF_STARTING 0x00000002 /* being created */ #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_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ #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_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ #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_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ #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_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */
5、表示进程亲属关系的成员
struct task_struct *real_parent; /* real parent process */struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */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 */
int exit_code, exit_signal;
int pdeath_signal; /* The signal sent when the parent dies *//* ??? */unsignedint personality;
unsigned did_exec:1;
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
* execve */unsigned in_iowait:1;
/* Revert todefault priority/policy when forking */
unsigned sched_reset_on_fork:1;
/* file system info */int link_count, total_link_count;
/* filesystem information */struct fs_struct *fs;
/* open file information */struct files_struct *files;
#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_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
（30）、JFS文件系统
/* journalling filesystem info */void *journal_info;
（31）、块设备链表
/* stacked block device info */struct bio_list *bio_list;
（32）、内存回收
struct reclaim_state *reclaim_state;
（33）、存放块设备I/O数据流量信息
struct backing_dev_info *backing_dev_info;
（34）、I/O调度器所使用的信息
struct io_context *io_context;
（35）、记录进程的I/O计数
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
（36）、CPUSET功能
#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
（37）、Control Groups
#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_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
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
/* Index of current stored address in ret_stack */
int curr_ret_stack;
/* Stack ofreturn addresses forreturnfunction 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 of trace recursion */
unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
本文介绍了Linux系统如何通过task_struct结构体管理进程，详细解释了进程状态、标识符、内核栈、亲属关系等关键概念。
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