linux-kernel - Re: [PATCH v2] slub: move kmem_cache

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Message-ID: <4BF79761.5000402@cs.helsinki.fi>
Date:	Sat, 22 May 2010 11:35:45 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
CC:	cl@...ux.com, linux-mm@...ck.org, alex.shi@...el.com,
	yanmin_zhang@...ux.intel.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, rjw@...k.pl
Subject: Re: [PATCH v2] slub: move kmem_cache_node into it's own cacheline

Alexander Duyck wrote:
> This patch is meant to improve the performance of SLUB by moving the local
> kmem_cache_node lock into it's own cacheline separate from kmem_cache.
> This is accomplished by simply removing the local_node when NUMA is enabled.
> 
> On my system with 2 nodes I saw around a 5% performance increase w/
> hackbench times dropping from 6.2 seconds to 5.9 seconds on average.  I
> suspect the performance gain would increase as the number of nodes
> increases, but I do not have the data to currently back that up.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>

Thanks for the fix, Alexander!

Yanmin and Alex, can I have your Tested-by or Acked-by please so we can 
close "[Bug #15713] hackbench regression due to commit 9dfc6e68bfe6e" 
after this patch is merged?

			Pekka
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