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Bug#960152: linux-image-5.6.0-1-arm64: Enable compressed modules

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  Bug#960152: linux-image-5.6.0-1-arm64: Enable compressed modules Vagrant Cascadian <vagrant@debian.org> - 2020-05-10 01:20 +0200
    Bug#960152: linux-image-5.6.0-1-arm64: Enable compressed modules Aurelien Jarno <aurelien@aurel32.net> - 2020-05-19 18:40 +0200

#67035 — Bug#960152: linux-image-5.6.0-1-arm64: Enable compressed modules

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Package: src:linux
Version: 5.6.7-1
Severity: wishlist

The on-disk kernel modules take up a significant amount of the package
installation size, and most modules aren't actively used on any given
system. In debian-installer, the "on-disk" modules take up space in ram
during the installation.

From the linux Makefile:

  # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
  # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
  # or CONFIG_MODULE_COMPRESS_XZ.

I'm not sure how to enable it; I don't see it mentioned in any Kconfig
files. It does appear possible to manually compress the individual .ko
files as an alternative method, if that is somehow more flexible.


The kmod utility supports xz compressed modules since version 25-1 (26-1
is present in buster, the current debian stable release). Unfortunately,
gzip isn't supported in kmod yet (patch submitted in #960149).

What other software needs support enabled in order to support on-disk
compressed modules in the linux kernel packages?


live well,
  vagrant

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#67124

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On 2020-05-09 16:09, Vagrant Cascadian wrote:
> Package: src:linux
> Version: 5.6.7-1
> Severity: wishlist
> 
> The on-disk kernel modules take up a significant amount of the package
> installation size, and most modules aren't actively used on any given
> system. In debian-installer, the "on-disk" modules take up space in ram
> during the installation.
> 
> From the linux Makefile:
> 
>   # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
>   # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
>   # or CONFIG_MODULE_COMPRESS_XZ.
> 
> I'm not sure how to enable it; I don't see it mentioned in any Kconfig
> files. It does appear possible to manually compress the individual .ko
> files as an alternative method, if that is somehow more flexible.
> 
> 
> The kmod utility supports xz compressed modules since version 25-1 (26-1
> is present in buster, the current debian stable release). Unfortunately,

Note that this is not true for the kmod udeb. For that a liblzma5-udeb
package has to be created first.

Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

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