linux-kernel - Re: [PATCHSET 2.6.22-rc2-mm1] sysfs: reduce memory footprint of sysfs

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Date:	Tue, 29 May 2007 12:04:30 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Tejun Heo" <htejun@...il.com>
Cc:	gregkh@...e.de, cornelia.huck@...ibm.com, oneukum@...e.de,
	rpurdie@...ys.net, stern@...land.harvard.edu, maneesh@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET 2.6.22-rc2-mm1] sysfs: reduce memory footprint of sysfs_dirent

Hi Tejun,

On 5/28/07, Tejun Heo <htejun@...il.com> wrote:
> Hello, all.
>
> This patchset reduces the size of sysfs_dirent to 88 byte from 136 on
> 64bit and to 52 from 76 on 32bit.  Combined with forthcoming
> reclaimable sysfs directories, this will make sysfs much more scalable
> on very large machines and very small machines.
>
> This patchset contains the following three patches.
>
> #01: move-s_active-functions-to-fs-sysfs-dir-c, prep for #02
> #02: slim-down-sysfs_dirent-s_active
> #03: use-signly-linked-list-for-sysfs_dirent-tree
>
> I'm pretty sure #02 is a good idea but #03 is debatable.  The code
> doesn't look much uglier after the conversion tho.  Inputs welcome.
>

I think that #3 is a good idea as well - we have a lot of sysfs
objects on any given system and slimming down sysfs benefits everyone.

-- 
Dmitry
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