Hi all,
I have been looking the copy_process function (in fork.c file) to understand how the kernel create new processes.
In
line 1004, the function verify if the current user is able to create a
new process, by checking if the value stored in rlim[RLIMIT_PROC] is
equal or smaller than the number of processes owned by the user. This
comparison is performed after creating the new process task_struct
using dup_task_struct (line 993).
I'm wondering why the code does not perform the resource limit
comparison before creating the new process task_struct. In case the
user cannot create more processes, some cpu cycles will be saved. I'm
sure there is a good reason for not doing it as I'm think it should be.
Can anyone shed any light on this ?
Thanks in advance.
Regards.
