Re: [PATCH 1/2] lib: Provide generic atomic64_t implementation

Linus Torvalds
2009-06-13T20:26:14Z

On Sat, 13 Jun 2009, Linus Torvalds wrote:
>
> On Sat, 13 Jun 2009, Paul Mackerras wrote:
> >
> > Linus, Andrew: OK if this goes in via the powerpc tree?
>
> Ok by me.

Btw, do 32-bit architectures really necessarily want 64-bit performance
counters?

I realize that 32-bit counters will overflow pretty easily, but I do
wonder about the performance impact of doing things like hashed spinlocks
for 64-bit counters. Maybe the downsides of 64-bit perf counters on such
architectures might outweight the upsides?

Linus