Current File : //usr/share/systemtap/examples/memory/pfaults.stp
#!/usr/bin/stap
global fault_entry_time, fault_address, fault_access
global time_offset
probe begin { time_offset = gettimeofday_us() }
probe vm.pagefault {
t = gettimeofday_us()
fault_entry_time[tid()] = t
fault_address[tid()] = address
fault_access[tid()] = write_access ? "w" : "r"
}
probe vm.pagefault.return {
t=gettimeofday_us()
if (!(tid() in fault_entry_time)) next
e = t - fault_entry_time[tid()]
if (vm_fault_contains(fault_type,VM_FAULT_MINOR)) {
ftype="minor"
} else if (vm_fault_contains(fault_type,VM_FAULT_MAJOR)) {
ftype="major"
} else {
next #only want to deal with minor and major page faults
}
printf("%d:%d:%id:%s:%s:%d\n",
t - time_offset, tid(), fault_address[tid()], fault_access[tid()], ftype, e)
#free up memory
delete fault_entry_time[tid()]
delete fault_address[tid()]
delete fault_access[tid()]
}
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