malloc() and spinlocks

[Wolfram Gloger]

> This patch is still not in glibc as far as I can see.  Wolfram, what
> should happen with it?

I've still got on my TODO to check how NPTL handles fast inline
spinlocks, to avoid that \approx1.5% penalty for the single-threaded
case.  As I said, the patch could also be applied as-is to get the
\approx10% improvement for the threaded case on ix86.

Regards,
Wolfram.