Re: [patch 01/23] Fall back on interrupt disable in cmpxchg8b on 80386 and 80486

Christoph Lameter
2007-08-20T20:47:29Z

On Mon, 20 Aug 2007, Mathieu Desnoyers wrote:

> Yes, I use it as synchronization mechanism for my buffer management algorithm
> in LTTng. Since I write in per-cpu buffers and want to be as reentrant
> as possible wrt other contexts (dealing with NMI as worse case, but also
> applies to MCE..), I use local_cmpxchg to reserve space in my buffers.
> It is faster than the standard cmpxchg.

Ok I have seen these numbers in the OLS papers but I could not reproduce
them in SLUB.