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

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Message-ID: <20101207232000.GA5353@shaohui>
Date:	Wed, 8 Dec 2010 07:20:00 +0800
From:	Shaohui Zheng <shaohui.zheng@...ux.intel.com>
To:	Eric B Munson <emunson@...bm.net>
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

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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