linux-kernel - Re: [PATCH 0/4] De-couple sysfs memory directories from memory sections

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Date:	Mon, 10 Jan 2011 12:47:22 -0600
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	Greg KH <greg@...ah.com>
CC:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Robin Holt <holt@....com>
Subject: Re: [PATCH 0/4] De-couple sysfs memory directories from memory sections

On 01/10/2011 12:44 PM, Greg KH wrote:
> On Mon, Jan 10, 2011 at 12:08:56PM -0600, Nathan Fontenot wrote:
>> This is a re-send of the remaining patches that did not make it
>> into the last kernel release for de-coupling sysfs memory
>> directories from memory sections.  The first three patches of the
>> previous set went in, and this is the remaining patches that
>> need to be applied.
> 
> Well, it's a bit late right now, as we are merging stuff that is already
> in our trees, and we are busy with that, so this is likely to be ignored
> until after .38-rc1 is out.
> 
> So, care to resend this after .38-rc1 is out so people can pay attention
> to it?

I was afraid of this. I didn't get a chance to get it out sooner but thought
I would send it out anyway.

> 
> 
>> The root of this issue is in sysfs directory creation. Every time
>> a directory is created a string compare is done against all sibling
>> directories to ensure we do not create duplicates.  The list of
>> directory nodes in sysfs is kept as an unsorted list which results
>> in this being an exponentially longer operation as the number of
>> directories are created.
> 
> Are you sure this is still an issue?  I thought we solved this last
> kernel or so with a simple patch?

I'll go back and look at this again.

thanks,
-Nathan
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