linux-kernel - Re: device struct bloat

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Message-Id: <1194208158.5911.63.camel@lappy>
Date:	Sun, 04 Nov 2007 21:29:18 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: device struct bloat


On Sat, 2007-11-03 at 12:48 -0700, Stephen Hemminger wrote:
> The sizeof(struct device) is way too big, especially in the network device case.
> We want to support 1000's of device's and the change from class_device to
> net_device has caused needless bloat.
> 
> sizeof(struct device) = 272
> sizeof(struct class_device) = 92
>   * not the class_id in class_device could also be removed or changed to
>      a ptr, since it is redundant for net_devices.

The thing that surprised me most was that it contains a struct
semaphore, Greg, is that really needed?



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