Re: Return values for vm.pagefault.return changed with newer kernels

[William Cohen <wcohen at redhat dot com>]

Frank Ch. Eigler wrote:
> William Cohen <wcohen@redhat.com> writes:
> 
>> [...]
>> Seems like the saner way to take care of this is to move the this information
>> into the tapsets/memory.stp [...]
>>
>> function vm_fault_minor(long:fault_no)
>> function vm_fault_major(long:fault_no)
>> function vm_fault_oom(long:fault_no)
>> function vm_fault_sigbus(long:fault_no)
>> function vm_fault_error(long:fault_no)
> 
> I guess we need to speculate about future uses and possible future
> changes of this stuff.  It would make about as much sense to have
> something smaller api-wise:
> 
> a single test function
>    function vm_fault_class_p(fault_number:long, class:string)
> and a variable that lists available classes
>    global vm_fault_classes:string []
> 
> ... or else to have code that converts the old style enums to new
> style bit masks in some tapset variable.
> 
> 
> - FChE

I was thinking about an alternative that converted the fault number into a
string, similar to the errno_str function in the errno.stp.

function vm_fault_str(long:fault_no)

Multiple bits would be separated with |. Thus, vm_fault_str(0xc) would return
"VM_FAULT_MAJOR|VM_FAULT_WRITE"

-Will