Re: [PATCH 0/4] convert perf to local64_t

Frederic Weisbecker
2010-05-26T10:08:52Z

On Fri, May 21, 2010 at 03:42:05PM +0200, Peter Zijlstra wrote:
> These patches introduce local64_t.
>
> Since perf_event:count is only modified cross-cpu when child-counters
> feed back their changes on exit, and we can use a secondary variable
> for that, we can convert perf to use local64_t instead of atomic64_t
> and use instructions without buslock semantics.
>
> The local64_t implementation uses local_t for 64 bits, since local_t is
> of type long, for 32 bit it falls back to atomic64_t. Architectures can
> provide their own implementation as usual.

It seems nobody disagrees with it. Can we give it a try?

Thanks.