linux-kernel - Re: [PATCH] Compress kernel modules on installation.

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Date:	Sun, 18 Jan 2009 22:04:16 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Steve Brokenshire <sbrokenshire@...tia.co.uk>,
	linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH] Compress kernel modules on installation.

On Fri, Dec 26, 2008 at 08:50:34PM +0100, Jan Engelhardt wrote:
> 
> On Friday 2008-12-26 20:48, Sam Ravnborg wrote:
> >> >> 
> >> >> This patch allows kernel modules to be compressed when 'make
> >> >> modules_install' is run after being copied to
> >> >> the /lib/module/<version>/<...> directory which is useful if you have
> >> >> module-init-tools installed with --enable-zlib. This patch adds an
> >> >> option (MODULE_COMPRESS) to the kernel configuration file (specifically
> >> >> init/Kconfig) so that the kernel modules will compressed if
> >> >> MODULE_COMPRESS is set.
> >> 
> >> I recently started compressing my kernel modules and that saved me
> >> at least 70 MB of disk space on mostlyallmodconfig.
> >> (And no, the argument of disks being cheap is not so true with
> >> CF or SSD.)
> >> Distro is lazy and wants to wait for upstream to have it,
> >> so is there any chance of getting this proposal in?
> >
> >Steve said he wanted to try to make the solution more
> >scalable so I am awaiting a new patch.
> 
> Hm, all I needed was this patch. It might fire up some people,
> but it's got all the scalability I could think of..

Can I ask you to redo this patch.
I want a way to swith off compression, but it should default be enable.
So if KBUILD_MODULE_NOCOMPRESS is undefined we will compress the modules
when we install them.

Something like:

      cmd_modules_install =                                               \
         mkdir -p $(2); cp $@ $(2) ;                                      \
         $(mod_strip_cmd) $(2)/$(notdir $@)                               \
         $(if $(KBUILD_MODULES_NOCOMPRESS),, ;gzip -9f $(2)/$(notdir $@))

And add documentation to Documentation/kbuild/kbuild.txt too...

Thanks,
	Sam
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