Linux Kernel Development -- list all processes in the system

1. List all processes in the kernel module:

Traverse the kernel linked list from init_task and output all processes

# Include <Linux/module. h> # Include <Linux/list. h> # Include <Linux/init. h> # Include <Linux/sched. h> Module_license (  "  Dual BSD/GPL  "  );  Static   Int Test_init ( Void  ){ Struct Task_struct * task ,* P;  Struct List_head * Pos;  Int Count = 0  ; Printk (kern_alert  "  Test Module init \ n  "  ); Task = & Init_task; list_for_each (Pos, & Task-> Tasks) {P = List_entry (Pos,Struct  Task_struct, tasks); count ++ ; Printk (kern_alert  "  % S [% d] \ n  " , P-> comm, p-> PID);} printk (kern_alert  "  Total % d Tasks \ n  "  , Count );  Return   0  ;}  Static  Void Test_exit ( Void  ) {Printk (kern_alert  "  Test Module exit! \ N  "  );} Module_init (test_init); module_exit (test_exit ); 

Makefile

Ifneq ($ (kernelrelease),) OBJ-M: =Test. oElseKdir:=/Lib/modules/$ (shell uname-R )/Buildpwd:=$ (Shell PWD)Default: $ (Make)-C $ (kdir) M =$ (PWD) modulesendif
 

2. Use systemtap to output all processes:

//Process_list.stp%{# Include<Linux/list. h># Include<Linux/sched. h> %} Function process_list ()%{StructTask_struct *P;StructList_head * _ p ,*_ N; for_each_process (p) {_ stp_printf ("%-15 s (%-5d) \ n", P-> comm, p->PID );}%} Probe begin {process_list (); exit ()}
 

Running Method

# STAP-G process_list.stp Init (  1  ) Kthreadd (  2  ) Migration / 0 ( 3  ) Ksoftirqd / 0 ( 4  ) Migration / 0 ( 5  ) Watchdog /0 ( 6  ) Migration / 1 ( 7  ) Migration / 1 ( 8  ) Ksoftirqd / 1 ( 9  ) Watchdog / 1 ( 10 ) Events / 0 ( 11  ) Events / 1 ( 12  ) Cpuset (  13  ) Khelper (  14  ) Netns (  15  ).... 

3. Use systemtap to print the UTS namespace information of the process

  // Namespace_uts.stp % {# Include <Linux/list. h> # Include <Linux/sched. h> # Include <Linux/nsproxy. h> # Include <Linux/utsname. h> % } Function process_list () % {  Struct Task_struct * P;  Struct List_head * _ p ,* _ N;  Struct Uts_namespace * Uts;  Struct New_utsname * Utsname; for_each_process (p) {Uts = P-> nsproxy-> Uts_ns; utsname = & (UTS-> Name); _ stp_printf (  "  %-15 s (%-5d) %-24 S %-16s \ n  " , P-> comm, p-> PID, utsname-> release, utsname-> Sysname );} % } Probe begin {process_list (); exit ()} 

# STAP-G namespace_uts.stp Init (  1 ) 2.6 . 32 - 220  . El6.x86 _ 64 Linux kthreadd (  2 ) 2.6 . 32 - 220  . El6.x86 _ 64 Linux migration / 0 ( 3 )2.6 . 32 - 220  . El6.x86 _ 64 Linux ksoftirqd / 0 ( 4 ) 2.6 . 32 - 220  . El6.x86 _ 64 Linux migration / 0 ( 5 ) 2.6 .32 - 220  . El6.x86 _ 64 Linux Watchdog / 0 ( 6 ) 2.6 . 32 - 220  . El6.x86 _ 64 Linux migration / 1 ( 7 ) 2.6 . 32 -220  . El6.x86 _ 64 Linux migration / 1 ( 8 ) 2.6 . 32 - 220  . El6.x86 _ 64 Linux .... 

Reference:

Http://blog.csdn.net/lzuzhp06/article/details/6933525

Linux Kernel Development