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

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Message-ID: <20100513180550.GA26440@suse.de>
Date:	Thu, 13 May 2010 11:05:51 -0700
From:	Greg KH <gregkh@...e.de>
To:	Dave Hansen <dave@...ux.vnet.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,
	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,
	haicheng.li@...ux.intel.com, shaohui.zheng@...ux.intel.com
Subject: Re: [RFC, 3/7] NUMA hotplug emulator

On Thu, May 13, 2010 at 10:54:52AM -0700, Dave Hansen wrote:
> On Thu, 2010-05-13 at 09:55 -0700, 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.
> > 
> > Also note that sysfs files are "one value per file", which I don't think
> > this file follows, right?
> 
> I think in this case, it was meant to be a list of acceptable parameters
> rather than a set of values, kinda like /sys/power/state.  Instead, I
> guess we could have:
> 
> 	/sys/devices/system/node/probeable/3
> 	/sys/devices/system/node/probeable/43
> 	/sys/devices/system/node/probeable/65
> 	/sys/devices/system/node/probeable/5145
> 
> and the knowledge that you need to pick one of those to echo
> into /sys/devices/system/node/probe.  But, it's a lot more self
> explanatory if you 'cat /sys/devices/system/node/probe', and then pick
> one of those to echo back into the file.
> 
> Seems like a decent place to violate the "rule". :)

How big would this "list" be?  What will it look like exactly?

thanks,

greg k-h
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