linux-kernel - [PATCH 3/3] FUTEX : NUMA friendly global hashtable

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Message-Id: <200703152020.43707.dada1@cosmosbay.com>
Date:	Thu, 15 Mar 2007 20:20:43 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>,
	Ulrich Drepper <drepper@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	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: [PATCH 3/3] FUTEX : NUMA friendly global hashtable

[PATCH 3/3] FUTEX : NUMA friendly global hashtable

On NUMA machines, we should get better performance using a big futex 
hashtable, allocated with vmalloc() so that it is spreaded on several nodes.

I chose a static size of four pages. (Very big NUMA machines have 64k page 
size)

This patch should have a temporary effect, as most futexes are expected to be 
stored in process private tables. We probably can drop it  in five years :)

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 kernel/futex.c |   26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

View attachment "futex_p3.patch" of type "text/plain" (1771 bytes)