linux-kernel - Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory sections

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Message-ID: <1285687056.19976.6155.camel@nimitz>
Date:	Tue, 28 Sep 2010 08:17:36 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Nathan Fontenot <nfont@...tin.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...abs.org, Greg KH <greg@...ah.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 0/8] v2 De-Couple sysfs memory directories from memory
 sections

On Tue, 2010-09-28 at 14:44 +0200, Avi Kivity wrote:
> Why not update sysfs directory creation to be fast, for example by using 
> an rbtree instead of a linked list.  This fixes an implementation 
> problem in the kernel instead of working around it and creating a new ABI.
> 
> New ABIs mean old tools won't work, and new tools need to understand 
> both ABIs.

Just to be clear _these_ patches do not change the existing ABI.

They do add a new ABI: the end_phys_index file.  But, it is completely
redundant at the moment.  It could be taken out of these patches.

That said, fixing the directory creation speed is probably a worthwhile
endeavor too.

-- Dave

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