lookup jiffies functions with kallsyms

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
typo

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Example with a probe on block issue/complete requests

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>