c - In the Linux kernel, what does it mean for a process to be "whole"? -


this code file /fs/proc/array.c in linux headers. int whole parameter mean? want know why need accumulate min_flt , maj_flts sig_struct , other times it's ok read values straight out of task_struct

346 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 347       struct pid *pid, struct task_struct *task, int whole) ... 406     /* add live thread stats @ group level */ 407     if (whole) { 408       struct task_struct *t = task; 409       { 410         min_flt += t->min_flt; 411         maj_flt += t->maj_flt; 412         gtime = cputime_add(gtime, t->gtime); 413         t = next_thread(t); 414       } while (t != task); 415  416       min_flt += sig->min_flt; 417       maj_flt += sig->maj_flt; 418       thread_group_times(task, &utime, &stime); 419       gtime = cputime_add(gtime, sig->gtime); 420     } ... 431   if (!whole) { 432     min_flt = task->min_flt; 433     maj_flt = task->maj_flt; 434     task_times(task, &utime, &stime); 435     gtime = task->gtime; 436   }

"whole" argument name , in context seems indicate "do_task_stat whole thread group".

do_task_stat static function used within /fs/proc/array.c used in 2 places: proc_tid_stat (tid "thread id") , proc_tgid_stat (tgid "thread group id").

see linux - threads , process explaination of thread groups.


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