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

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Message-ID: <20100308025835.GC20695@one.firstfloor.org>
Date:	Mon, 8 Mar 2010 03:58:35 +0100
From:	Andi Kleen <andi@...stfloor.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>,
	Christoph Lameter <cl@...ux-foundation.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, Mar 05, 2010 at 02:47:04PM +0200, Anca Emanuel wrote:
> Dumb question: it is possible to hot remove the (bad) memory ? And add
> an good one ?

Not the complete DIMM, but if a specific page containing a stuck
bit or similar can be removed since 2.6.33 yes

In theory you could add new memory replacing that memory if your
hardware and your kernel supports that, but typically that's
not worth it for a few K.

> Where is the detection code for the bad module ?

Part of the code is in the kernel, part in mcelog.
It only works with ECC memory and supported systems ATM (currently
Nehalem class Intel Xeon systems)

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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