Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA improvements

Peter Zijlstra
2007-03-16T08:05:48Z

On Thu, 2007-03-15 at 20:10 +0100, Eric Dumazet wrote:
> Hi
>
> I'm pleased to present these patches which improve linux futex performance and
> scalability, on both UP, SMP and NUMA configs.
>
> I had this idea last year but I was not understood, probably because I gave
> not enough explanations. Sorry if this mail is really long...

I started playing with it after your last reference to it, I have some
code here (against -rt):
http://programming.kicks-ass.net/kernel-patches/futex-vma-cache/

Which I will post once I have the found what keeps pthread_join() from
completing :-(

It basically adds a per task vma lookup cache which can also activate
the private logic without explicit use of the new interface.