在系统调用中获取Cpu和内存信息

Question

I am trying to achieve CPU and Memory usage information of current process, inside a system call. I can get current process name, pid and uid by using :

current->comm //process name
current->pid //process id
current_uid() //uid

but that seems to be all.(I am using kernel 3.2.0-24-generic)

As I have seen from Memory usage of current process in C , reading(vfs_read) and parsing /proc/pid/status seems to be the only option to get memory and cpu usage.

Is there a better way to obtain this information, or am I on the right track?

I also test my code as a kernel module first, since both system calls and kernel modules are running in kernel space. Is that also bad approach?

Answer 1

current->mm is the place where all memory information is stored.
current->mm->mmap is a list of memory mappings for the process, so you can iterate it and see what you find there.

current->utime and current->stime may be useful for getting CPU information.