How to browse the code

Folks, Can you tell me how to effectively browse linux kernel code. I am familiar with lxr etc but they do not do what I want or atleast I do not know how to. I am looking for something that can list all the places that a certain field of a certain structure is used. For example, sk_buff has a field called destructor, but so do many other data structures. How do I search for places where just the destructor field of sk_buff. Thanks a lot. -- CS1