Subject: Re: [PATCH 0/8] v5 De-couple sysfs memory directories from memory
 sections
From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Nathan Fontenot <nfont@austin.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@ozlabs.org,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Greg KH <greg@kroah.com>
In-Reply-To: <4C60407C.2080608@austin.ibm.com>
References: <4C60407C.2080608@austin.ibm.com>
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Date: Wed, 11 Aug 2010 08:18:52 -0700
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On Mon, 2010-08-09 at 12:53 -0500, Nathan Fontenot wrote:
> This set of patches de-couples the idea that there is a single
> directory in sysfs for each memory section.  The intent of the
> patches is to reduce the number of sysfs directories created to
> resolve a boot-time performance issue.  On very large systems
> boot time are getting very long (as seen on powerpc hardware)
> due to the enormous number of sysfs directories being created.
> On a system with 1 TB of memory we create ~63,000 directories.
> For even larger systems boot times are being measured in hours. 

Hi Nathan,

The set is looking pretty good to me.  We _might_ want to up the ante in
the future and allow it to be even more dynamic than this, but this
looks like a good start to me.

BTW, have you taken a look at what the hotplug events look like if only
a single section (not filling up a whole block) is added?  

Feel free to add my:

Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>

-- Dave

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