CCP In PPP

Hi,
I am using linux-2.6.10 mandrake. In which i am establishing PPP sessions with the peer.During the PPP negotiations i negotiate even CCP-deflate compression option.
I just wanted to know the amount of memory which is being used in kernel space by the compression algorithms,when a ccp compressed session is established.
Or in general how will i come to know about the amount of memory being used in kernel space at run time.Becoz top command shows memory being used only in user space.

Regards,
Sriram..