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

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Date:	Tue, 2 Mar 2010 13:53:06 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Andi Kleen <andi@...stfloor.org>,
	Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	haicheng.li@...el.com,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [patch] slab: add memory hotplug support

On Mon, Mar 01, 2010 at 02:24:43AM -0800, David Rientjes wrote:
> Slab lacks any memory hotplug support for nodes that are hotplugged
> without cpus being hotplugged.  This is possible at least on x86
> CONFIG_MEMORY_HOTPLUG_SPARSE kernels where SRAT entries are marked
> ACPI_SRAT_MEM_HOT_PLUGGABLE and the regions of RAM represent a seperate
> node.  It can also be done manually by writing the start address to
> /sys/devices/system/memory/probe for kernels that have
> CONFIG_ARCH_MEMORY_PROBE set, which is how this patch was tested, and
> then onlining the new memory region.

The patch looks far more complicated than my simple fix.

Is more complicated now better?

-Andi

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