linux-kernel - Re: [PATCH] Fake NUMA emulation for PowerPC (Take 2)

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Message-ID: <20080127150147.GA10914@balbir.in.ibm.com>
Date:	Sun, 27 Jan 2008 20:31:47 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linuxppc-dev@...abs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Fake NUMA emulation for PowerPC (Take 2)

* Paul Mackerras <paulus@...ba.org> [2008-01-27 22:55:43]:

> Balbir Singh writes:
> 
> > Here's a better and more complete fix for the problem. Could you
> > please see if it works for you? I tested it on a real NUMA box and it
> > seemed to work fine there.
> 
> There are a couple of other changes in behaviour that your patch
> introduces, and I'd like to understand them better before taking the
> patch.  First, with your patch we don't set nodes online if they end
> up having no memory in them because of the memory limit, whereas
> previously we did.  Secondly, in the case where we don't have NUMA
> information, we now set node 0 online after adding each LMB, whereas
> previously we only set it online once.
> 
> If in fact these changes are benign, then your patch description
> should mention them and explain why they are benign.
>

Yes, they are. I'll try and justify the changes with a good detailed
changelog. If people prefer it, I can hide fake NUMA nodes under a
config option, so that it does not come enabled by default.

Thanks for keeping me honest.

> Paul.
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...abs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
> 

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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