Questions about tool #bcc


I have some questions about tool.
Why the total accesses is defined as the times of entering mark_page_accessed plus mark_buffer_dirty functions?
Doesn't enter mark_buffer_dirty must also enter mark_page_accessed, that is, doesn't they overlap?
I don't really get it...... If someone can tell me why, I will be grateful!                                                                

Join { to automatically receive all group messages.