linux-kernel - Re: [RFC, 3/7] NUMA hotplug emulator

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Message-ID: <4BECAEF6.2090009@linux.intel.com>
Date:	Fri, 14 May 2010 10:01:26 +0800
From:	Haicheng Li <haicheng.li@...ux.intel.com>
To:	Greg KH <gregkh@...e.de>
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,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Alex Chiang <achiang@...com>, linux-kernel@...r.kernel.org,
	ak@...ux.intel.com, fengguang.wu@...el.com,
	shaohui.zheng@...ux.intel.com
Subject: Re: [RFC, 3/7] NUMA hotplug emulator

Greg KH wrote:
>> Add a sysfs entry "probe" under /sys/devices/system/node/:
>>
>>  - to show all fake offlined nodes:
>>     $ cat /sys/devices/system/node/probe
>>
>>  - to hotadd a fake offlined node, e.g. nodeid is N:
>>     $ echo N > /sys/devices/system/node/probe
> 
> As you are trying to add a new sysfs file, please create the matching
> Documentation/ABI/ file as well.

Yes, we missed it. thank you.

> Also note that sysfs files are "one value per file", which I don't think
> this file follows, right?

Sorry, we didn't make the descriptions clear enough.
It should follow "one value per file". It intends to show acceptable parameters.

For example, if we have 4 fake offlined nodes, like node 2-5, then:
   $ cat /sys/devices/system/node/probe
     2-5

Then user hotadds node3 to system:
   $ echo 3 > /sys/devices/system/node/probe
   $ cat /sys/devices/system/node/probe
     2,4-5

-haicheng
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