linux-kernel - Re: [PATCH] memory hotplug disable boot option

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Message-ID: <1277769867.8354.531.camel@nimitz>
Date:	Mon, 28 Jun 2010 17:04:27 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Nathan Fontenot <nfont@...tin.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] memory hotplug disable boot option

On Mon, 2010-06-28 at 08:44 -0700, Greg KH wrote:
> > The directories being created are the standard directories, one for each of the memory
> > sections present at boot.  I think the most used files in each of these directories
> > is the state and removable file used to do memory hotplug.
> 
> And perhaps we shouldn't really be creating so many directories?  Why
> not work with the memory hotplug developers to change their interface to
> not abuse sysfs in such a manner? 

Heh, it wasn't abuse until we got this much memory.  But, I think this
one is pretty much 100% my fault.

Nathan, I think the right fix here is probably to untie sysfs from the
sections a bit.  We should be able to have sysfs dirs that represent
more than one contiguous SECTION_SIZE area of memory.

It will mean re-teaching some of the tools how things work.  They'll
have to know that you can split mem sections, and we'll have to come up
with a way to do the splitting.  

Does ppc *really* remove 16MB sections of RAM these days?  It's probably
worth checking with the firmware folks to see what the limits are in
practice.

-- Dave

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