linux-kernel - Re: [1/7,v8] NUMA Hotplug Emulator: documentation

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Message-ID: <20101208181644.GA2152@mgebm.net>
Date:	Wed, 8 Dec 2010 11:16:44 -0700
From:	Eric B Munson <emunson@...bm.net>
To:	Shaohui Zheng <shaohui.zheng@...ux.intel.com>
Cc:	shaohui.zheng@...el.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	haicheng.li@...ux.intel.com, lethal@...ux-sh.org,
	ak@...ux.intel.com, rientjes@...gle.com, dave@...ux.vnet.ibm.com,
	gregkh@...e.de, Haicheng Li <haicheng.li@...el.com>
Subject: Re: [1/7,v8] NUMA Hotplug Emulator: documentation

Shaohui,

I was able to online a cpu to node 0 successfully.  My problem was that I did
not take the cpu offline before I released it.  Everything looks to be working
for me.

Thanks for your help,
Eric
On Wed, 08 Dec 2010, Shaohui Zheng wrote:

> On Tue, Dec 07, 2010 at 11:24:20AM -0700, Eric B Munson wrote:
> > Shaohui,
> > 
> > The documentation patch seems to be stale, it needs to be updated to match the
> > new file names.
> > 
> Eric,
> 	the major change on the patchset is on the interface, for the v8 emulator,
> we accept David's per-node debugfs add_memory interface, we already included
> in the documentation patch. the change is very small, so it is not obvious.
> 
> This is the change on the documentation compare with v7:
> +3) Memory hotplug emulation:
> +
> +The emulator reserves memory before OS boots, the reserved memory region is
> +removed from e820 table. Each online node has an add_memory interface, and
> +memory can be hot-added via the per-ndoe add_memory debugfs interface.
> +
> +The difficulty of Memory Release is well-known, we have no plan for it until
> +now.
> +
> + - reserve memory thru a kernel boot paramter
> + 	mem=1024m
> +
> + - add a memory section to node 3
> +    # echo 0x40000000 > mem_hotplug/node3/add_memory
> +	OR
> +    # echo 1024m > mem_hotplug/node3/add_memory
> +
> 
> -- 
> Thanks & Regards,
> Shaohui
> 

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