ftrace/perf_event leak

[Avi Kivity]

 I recently added perf_event support to kvm_stat, to display kvm 
tracepoints as statistics (I'd like to fold this to tools/perf 
eventually, but that's another story).  However I'm seeing a resource 
leak - after I quit the tool, there are quite a few references into the 
kvm module:

  kvm_intel              43655  0
  kvm                   272984  269 kvm_intel

The tool is just a python script that reads 
/sys/kernel/debug/tracing/events/kvm to find out which events are 
available, uses perf_event_open() to create one group per cpu to which a 
lot of events are attached.  The only special thing I can think of is 
that we use an ioctl to attach a filter to many perf_event descriptors.

You can find the source at 
http://git.kernel.org/?p=virt/kvm/qemu-kvm.git;a=blob_plain;f=kvm/kvm_stat;hb=5bd5f131b50cb373ff4e2a3632c6dad00a1f0b55.  
All it needs are the kvm modules loaded; no need to actually run a 
guest.  Run as root.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/