title: page level watchpoints in gdb
body: <p>Is there anyway in GDB to put a memory watchpoints on page level?
  I want to break on first access to a page, this access can be anywhere on that page, so i can't put a normal memory watchpoints - since I don't know the address -
  Also, is there anyway to change the page protection of memory page in GDB ( say change from r/w to no access ), this way any access to that page will cause an A/V and I can catch it
  Thanks</p>