[Devel] Re: [PATCH 2/2] move unneeded data to initdata section

[Sam Ravnborg]

On Thu, Nov 15, 2007 at 05:42:04PM +0300, Denis V. Lunev wrote:
> Eric W. Biederman wrote:
> > "Denis V. Lunev" <den at openvz.org> writes:
> > 
> >> This patch reverts Eric's commit 2b008b0a8e96b726c603c5e1a5a7a509b5f61e35
> >>
> >> It diets .text & .data section of the kernel if CONFIG_NET_NS is not set.
> >> This is safe after list operations cleanup.
> > 
> > Ok.  This patch is technically safe because none of the touched
> > code can live in a module and so we never touch the exit code path.
> > 
> > However in the general case and as a code idiom this __net_initdata
> > on struct pernet_operations is fundamentally horribly broken.
> > 
> > Look at what happens if we use this idiom in module.  There
> > is only one definition of __initdata ".init.data".  The module
> > loader places all sections that begin with .init in a region of
> > memory that will be discarded after module initialization.  
> 
> nothing is discarded after module load. Though, I can be wrong. Could
> you point me to the exact place?
If __initdata is not discarded after module load then we should do it.
There is no reason to waste __initdata RAM when the module is loaded.

	Sam
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