linux-kernel - Re: [patch 2/2 v2] mm: add node hotplug emulation

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Message-ID: <20101128051749.GA11474@suse.de>
Date:	Sat, 27 Nov 2010 21:17:49 -0800
From:	Greg KH <gregkh@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shaohui Zheng <shaohui.zheng@...el.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Haicheng Li <haicheng.li@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [patch 2/2 v2] mm: add node hotplug emulation

On Sat, Nov 27, 2010 at 05:52:03PM -0800, David Rientjes wrote:
> On Sun, 21 Nov 2010, Greg KH wrote:
> 
> > > Add an interface to allow new nodes to be added when performing memory
> > > hot-add.  This provides a convenient interface to test memory hotplug
> > > notifier callbacks and surrounding hotplug code when new nodes are
> > > onlined without actually having a machine with such hotpluggable SRAT
> > > entries.
> > > 
> > > This adds a new debugfs interface at /sys/kernel/debug/hotplug/add_node
> > 
> > The rule for debugfs is "there are no rules", but perhaps you might want
> > to name "hotplug" a bit more specific for what you are doing?  "hotplug"
> > means pretty much anything these days, so how about s/hotplug/node/
> > instead as that is what you are controlling.
> > 
> > Just a suggestion...
> > 
> 
> Hmm, how strongly do you feel about that?  There's nothing node specific 
> in the memory hotplug code where this lives, so we'd probably have to 
> define the dentry elsewhere and even then it would only needed for 
> CONFIG_MEMORY_HOTPLUG.
> 
> I personally don't see this as a node debugging but rather memory hotplug 
> callback debugging.

Then name it as such, not the generic "hotplug" like you just did.
"mem_hotplug" would make sense, right?

thanks,

greg k-h
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