linux-kernel - Re: [PATCH v2] mm/hotplug, x86: Disable ARCH_MEMORY

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Date:	Thu, 25 Jul 2013 23:38:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Toshi Kani <toshi.kani@...com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, dave@...1.net,
	kosaki.motohiro@...il.com, isimatu.yasuaki@...fujitsu.com,
	tangchen@...fujitsu.com, vasilis.liaskovitis@...fitbricks.com
Subject: Re: [PATCH v2] mm/hotplug, x86: Disable ARCH_MEMORY_PROBE by default


* Toshi Kani <toshi.kani@...com> wrote:

> > You claimed that the only purpose of this on x86 was 
> > that testing was done on non-hotplug systems, using 
> > this interface. Non-hotplug systems have e820 maps.
> 
> Right.  Sorry, I first thought that the interface needed 
> to work as defined, i.e. detect a new memory.  But for 
> the test purpose on non-hotplug systems, that is not 
> necessary.  So, I agree that we can check e820.
> 
> I summarized two options in the email below.
> https://lkml.org/lkml/2013/7/23/602
> 
> Option 1) adds a check with e820.  Option 2) deprecates 
> the interface by removing the config option from x86 
> Kconfig.  I was thinking that we could evaluate two 
> options after this patch gets in.  Does it make sense?

Yeah.

That having said, if the e820 check is too difficult to 
pull off straight away, I also don't mind keeping it as-is 
if it's useful for testing. Just make sure you document it 
as "you need to be careful with this" (beyond it being a 
root-only interface to begin with).

Thanks,

	Ingo
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