linux-kernel - Re: [patch] slab: add memory hotplug support

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Message-ID: <alpine.DEB.2.00.1003050808390.32229@router.home>
Date:	Fri, 5 Mar 2010 08:11:00 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Anca Emanuel <anca.emanuel@...il.com>
cc:	Nick Piggin <npiggin@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	"haicheng.li" <haicheng.li@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [patch] slab: add memory hotplug support

On Fri, 5 Mar 2010, Anca Emanuel wrote:

> Dumb question: it is possible to hot remove the (bad) memory ? And add
> an good one ?

Under certain conditions this is possible. If the bad memory was modified
then you have a condition that requires termination of all processes that
are using the memory. If its the kernel then you need to reboot.

If the memory contains a page from disk then the memory can be moved
elsewhere.

If you can clean up a whole range like that then its possible to replace
the memory.

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