linux-kernel - Re: [PATCH -mm] mm, memory-hotpulg: Rename movablenode boot option to movable

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Message-ID: <20131001054646.GA17220@gmail.com>
Date:	Tue, 1 Oct 2013 07:46:46 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>, linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, imtangchen@...il.com
Subject: Re: [PATCH -mm] mm, memory-hotpulg: Rename movablenode boot option
 to movable_node


* Zhang Yanfei <zhangyanfei.yes@...il.com> wrote:

> @@ -153,11 +153,18 @@ config MOVABLE_NODE
>  	help
>  	  Allow a node to have only movable memory.  Pages used by the kernel,
>  	  such as direct mapping pages cannot be migrated.  So the corresponding
> +	  memory device cannot be hotplugged.  This option allows the following
> +	  two things:
> +	  - When the system is booting, node full of hotpluggable memory can
> +	  be arranged to have only movable memory so that the whole node can
> +	  be hotplugged. (need movable_node boot option specified).

So this is _exactly_ what I complained about earlier: why is the 
movable_node boot option needed to get that extra functionality? It's 
clearly not just a drop-in substitute to CONFIG_MOVABLE_NODE but extends 
its functionality, right?

Boot options are _very_ poor user interface. If you don't want to enable 
it by default then turn this sub-functionality into 
CONFIG_MOVABLE_NODE_AUTO and keep it default-off - but don't pretend that 
this is only about CONFIG_MOVABLE_NODE alone - it isnt: as described above 
the 'movable_node' is needed for the full functionality to be available!

Thanks,

	Ingo
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