linux-kernel - Re: [RFC, 6/7] NUMA hotplug emulator

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Date:	Mon, 24 May 2010 09:26:39 +0800
From:	Shaohui Zheng <shaohui.zheng@...el.com>
To:	Ankita Garg <ankita@...ibm.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [RFC, 6/7] NUMA hotplug emulator

On Fri, May 21, 2010 at 03:41:04PM +0530, Ankita Garg wrote:
> Hi,
> 
> On Thu, May 13, 2010 at 08:00:16PM +0800, Shaohui Zheng wrote:
> > hotplug emulator:extend memory probe interface to support NUMA
> > 
> > Signed-off-by: Shaohui Zheng <shaohui.zheng@...el.com>
> > Signed-off-by: Haicheng Li <haicheng.li@...el.com>
> > Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> > ---
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 54ccb0d..787024f 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -1239,6 +1239,17 @@ config ARCH_CPU_PROBE_RELEASE
> >  	  is for cpu hot-add/hot-remove to specified node in software method.
> >  	  This is for debuging and testing purpose
> > 
> > +config ARCH_MEMORY_PROBE
> 
> The above symbol exists already...
Yes, we create CONFIG_NUMA_HOTPLUG_EMU, CONFIG_NODE_HOTPLUG_EMU and CONFIG_ARCH_CPU_PROBE_RELEASE options,
and move CONFIG_ARCH_MEMORY_PROBE together with the above 3 options.


> 
> > +	def_bool y
> > +	bool "Memory hotplug emulation"
> > +	depends on NUMA_HOTPLUG_EMU
> > +	---help---
> > +	  Enable memory hotplug emulation. Reserve memory with grub parameter
> > +	  "mem=N"(such as mem=1024M), where N is the initial memory size, the
> > +	  rest physical memory will be removed from e820 table; the memory probe
> > +	  interface is for memory hot-add to specified node in software method.
> > +	  This is for debuging and testing purpose
> > +
> >  config NODES_SHIFT
> >  	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
> >  	range 1 10
> 
> 
> -- 
> Regards,                                                                        
> Ankita Garg (ankita@...ibm.com)                                                 
> Linux Technology Center                                                         
> IBM India Systems & Technology Labs,                                            
> Bangalore, India

-- 
Thanks & Regards,
Shaohui

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