linux-kernel - Re: [PATCH 2/3] FUTEX : introduce private hashtables

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Date:	Thu, 15 Mar 2007 13:09:35 -0800
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	"Eric Dumazet" <dada1@...mosbay.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 2/3] FUTEX : introduce private hashtables

On 3/15/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> There should be little contention on the memory in the global hash anyway,
> because we can roughly reduce contention as a factor of hash-size/cacheline-size.
>
> What we will have are cache misses on the global table... but we're going to
> get cache misses on those private tables as well.

I'm thinking about NUMA cases.  If you have private tables for a
process which is pinned to some cluster in a NUMA machine the table is
local to the node.  If you have a global table you cannot optimize
your application for such a situation because at least some of the
pages of the global table are remote.
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