SystemTap vs. FC5 Xen kernels (was: 03-23-2006 Meeting minutes)

[William Cohen]

Stone, Joshua I wrote:

> I found two differences in the config files that will prevent SystemTap
> from running on the Xen kernels.  In 2054_FC5 and 2054_FC5kdump, the
> config files have:
> 
>     CONFIG_KPROBES=y
>     ...
>     CONFIG_DEBUG_INFO=y
> 
> Whereas in 2054_FC5xen0 and 2054_xenU, the config files have:
> 
>     # CONFIG_KPROBES is not set
> 
> ... with no mention of CONFIG_DEBUG_INFO.  This might explain the
> missing dwarf info in the kernel-debuginfo package.  And of course for
> SystemTap we need CONFIG_KPROBES=y.
> 
> 
> Josh

Sometimes the options are turned off on purpose. Do the Xen kernels 
build with "CONFIG_KPROBES=y"?

If kernels are built, do the resulting kernels actually have kprobe 
support? It use to be that xen kernels copy and pasted code from other 
arches. What additional patches are needed to bring the kprobe support 
in the xen kernel in line with the various architectures?

-Will