You can check if your kernel has built with I/O account by just simply checking /proc/self/io file. If it exists then you have I/O accounting built-in.
$ cat /proc/self/io rchar: 3809 wchar: 0 syscr: 10 syscw: 0 read_bytes: 0 write_bytes: 0 cancelled_write_bytes: 0
Field Descriptions: rchar - bytes read wchar - byres written syscr - number of read syscalls syscw - number of write syscalls read_bytes - number of bytes caused by this process to read from underlying storage write_bytes - number of bytes caused by this process to written from underlying storage
As you know, ever process is presented by it's pid number under /proc directory. You can access any process's I/O accounting values by just looking /proc/#pid/io file.
There is a utility called iotop which collects these values and shows you in like top utility. You see your processes I/O activity with iotop utility.