Thanks,
This did what I needed:
read_lock(&tasklist_lock);
do_each_thread(g,p){
touch_nmi_watchdog();
printk(" p=%d\n",p->pid);
} while_each_thread(g,p);
read_unlock(&tasklist_lock);
> I ran the piece of code.
>
> [om@turyx ~/prg/pid_list_test]$ dmesg | grep parent| wc -l; ps ax | wc -l
> 97
> 99
>
> second entry is 99 because of ps and wc. Seems like it is ok.
>
> --
> The public demands certainties; it must be told definitely and a bit
> raucously that this is true and that is false. But there are no certainties.
> -- H.L. Mencken, "Prejudice"
>
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