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Re: [libvirt] [PATCH 0/7] Update systemtap probing



On Wed, Oct 26, 2011 at 01:50:04PM +0800, lvroyce wrote:
> I believe enable systemtap will be very helpful for debugging.But I
> encountered belowing  error when enable systemtap support:
> 
> *emantic error: probe point mismatch at position 0 (alternatives:
> __nfs __scheduler __signal __tcpmib __vm _linuxmib _signal _sunrpc
> _syscall _vfs begin begin(number) end end(number) error
> error(number) generic ioblock ioblock_trace ioscheduler
> ioscheduler_trace ipmib irq_handler kernel kprobe kprocess linuxmib
> module(string) nd_syscall netdev never nfs nfsd perf process
> process(number) process(string) procfs procfs(string) scheduler scsi
> signal socket softirq stap staprun sunrpc syscall tcp tcpmib timer
> tty udp vfs vm workqueue): identifier 'libvirt' at :130:7 while
> resolving probe point libvirt.event_poll.run
>         source: probe libvirt.event_poll.run {
>                       ^
> Pass 2: analysis failed.  Try again with another '--vp 01' option.
> 
> *Here's my environment:
> *    Ubuntu 11.04 amd64
>     configured --with-dtrace --enable-shared=no --with-pic(fPIC flag
> also tried)
>     dtrace installed and compile probe with dtrace -64*
> 
> Would somebody pls give me some advice with this systemtap issue?

This means the libvirt_probes.stp file was not found in
/usr/share/systemtap/tapset.  Presumably you didn't do a
'make install' step, or you didn't set --prefix=/usr when
building. If you installed into a different directory, you
can try doing 'stap -I/your/other/location/share/systemtap/tapset demo.stp'

Regards,
Daniel
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