Adding systemtap probe points in pthread library

[Christoph Hellwig]

On Wed, Jul 21, 2010 at 11:56:14AM -0400, Rayson Ho wrote:
> Purpose 
> ======= 
> The changes here are systemtap probe points that would enable systemtap understand pthread behavior -- esp. mutex and read/write lock & unlock operations. 

Care to do it so it works with the upstream uprobes / perf userspace
tracing instead of non-mainline code that in this form doesn't have any
chance to be merged?