linux-kernel - Re: [7/7,v8] NUMA Hotplug Emulator: Implement per-node add

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Message-ID: <alpine.DEB.2.00.1012131255580.13478@chino.kir.corp.google.com>
Date:	Mon, 13 Dec 2010 12:56:13 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Shaohui Zheng <shaohui.zheng@...ux.intel.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, haicheng.li@...ux.intel.com,
	lethal@...ux-sh.org, Andi Kleen <ak@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [7/7,v8] NUMA Hotplug Emulator: Implement per-node add_memory
 debugfs interface

On Mon, 13 Dec 2010, Shaohui Zheng wrote:

> For the state transition to N_HIGH_MEMORY, it does not happen on the above too
> interfaces. It happens when the memory was onlined with sysfs /sys/device/system/memory/memoryXX/online
> interface.
> 
> That is the code path:
> store_mem_state
> 	->memory_block_change_state
> 	 	->memory_block_action
> 			->online_pages
> 
> 			if (onlined_pages) {
> 				kswapd_run(zone_to_nid(zone));
> 				node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
> 			}
> 
> does it address your question? thanks.
> 

Ok, thanks!
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