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

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Message-Id: <1174032341.7124.9.camel@twins>
Date:	Fri, 16 Mar 2007 09:05:41 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Ulrich Drepper <drepper@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] FUTEX : new PRIVATE futexes, SMP and NUMA
	improvements

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.

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