5 Apr
2012
5 Apr
'12
2:32 p.m.
Hello. I want to trace all write page-faults from an application. I use the pager that wait for page-fault and maps the fpage to thread calling l4_ipc_send_and_wait setting L4_ITEM_MAP. For tracing only write page-faults I map fpage as L4_FPAGE_RO if it was read-pf and then I map the same fpage with L4_FPAGE_RW if the next write-pf occurs. (I mean I map the same fpage with the different flags twice). But an application doesn't continue run. Also I have tried to l4_task_unmap(L4_FP_OTHER_SPACES) this fpage before mapping it as L4_FPAGE_RW. It doesn't work. What should I use to change fpage's rights to L4_FPAGE_RW for fpage that is already mapped as L4_FPAGE_RO for an application?
Ivan Bludov