linux-kernel - Re: [PATCH x86/mm] x86-64, NUMA: Don't call numa_set_distanc() for all possible node combinations during emulation

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Message-ID: <4D7A7272.70100@kernel.org>
Date:	Fri, 11 Mar 2011 11:05:22 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	David Rientjes <rientjes@...gle.com>, Ingo Molnar <mingo@...e.hu>,
	tglx@...utronix.de, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH x86/mm] x86-64, NUMA: Don't call numa_set_distanc() for
 all possible node combinations during emulation

On 03/11/2011 01:31 AM, Tejun Heo wrote:
> The distance transforming in numa_emulation() used to call
> numa_set_distance() for all MAX_NUMNODES * MAX_NUMNODES node
> combinations regardless of which are enabled.  As numa_set_distance()
> ignores all out-of-bound distance settings, this doesn't cause any
> problem other than looping unnecessarily many times during boot.
> 
> However, as MAX_NUMNODES * MAX_NUMNODES can be pretty high, update the
> code such that it iterates through only the enabled combinations.
> 
> Yinghai Lu identified the issue and provided an initial patch to
> address the issue; however, the patch was incorrect in that it didn't
> build emulated distance table when there's no physical distance table
> and unnecessarily complex.
> 
>   http://thread.gmane.org/gmane.linux.kernel/1107986/focus=1107988
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Yinghai Lu <yinghai@...nel.org>

Acked-by: Yinghai Lu <yinghai@...nel.org>
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