Process-related data structures in the Linux kernel (based on LINUX-MAINLINE-RC4)

1. Process Descriptor

struct Task_struct {

volatile long state;

.......

struct List_head tasks;

.......

struct mm_struct *mm, *active_mm;

.......

struct vm_area_struct *vmacache[vmacache_size];

......

pid_t pid;
pid_t Tgid;

.......
}
File: Include/linux/sched.h

2. The thread descriptor (current points to the descriptor, and the process descriptor is found by this descriptor)

struct Thread_info {
struct Task_struct *task; /* Main task structure */
Struct2.              Exec_domain *exec_domain; /* Execution Domain */
__U32 flags; /* Low Level flags */
__U32 status; /* Thread Synchronous Flags */
__U32 CPU; /* Current CPU */
int saved_preempt_count;
mm_segment_t Addr_limit;
struct Restart_block restart_block;
void __user *sysenter_return;
unsigned int sig_on_uaccess_error:1;
unsigned int uaccess_err:1; /* Uaccess failed */
};

File: arch/x86/include/asm/thread_info.h

3. Kernel stack of the process

Union thread_union {

struct Thread_info thread_info;

unsigned long stack[thread_size/sizeof (long)];

}

File: Include/linux/sched.h

　　　　

4. Running queue for a process

　struct Rt_prio_array {

Declare_bitmap (BITMAP, max_rt_prio+1);

struct List_head Queue[max_rt_prio];

}

File: Kernel/sched/sched.h