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Because I experiment with btrfs in my 12.04 server, I use recent 3.6.3-030603-generic kernel found in the kernel-ppa/mainline - Kernel Ubuntu (intended for 12.10 Quantal). I also use the LXC, which works better when the kernel is compiled with CONFIG_MEMCG and CONFIG_MEMCG_SWAP flags compiled (which are absent in the mentioned kernel).

I'd like to try to recompile the kernel with those flags in the way as Ubuntu-compatible as possible. How to do it? How to get the sources from 12.04 (Or should I install 12.10 just for this process?)

(All the tutorials I found on the Net eighter assume I use the newest kernel, or some specific version (different from mine) or that the kernel source is taken from apt-source)

Adam Ryczkowski
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If you want to just use linus' tree and to tweak the config to your own perferences then here is a method I use:

git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux

checkout the version you require, e.g.

git checkout -b v3.6 v3.6

grab a copy of an existing Ubuntu config

cp /boot/config-3.5.0-17-generic .config

..and modify it to if you want to add or remove various config options. You probably need to interactively answer some config option questions too.

and build:

make oldconfig
make deb-pkg INSTALL_MOD_STRIP=1

Note you won't be getting any of the Ubuntu kernel team fixes, CVE updates and SAUCE patches this way, so you are pretty well on your own to maintain this yourself.

Colin Ian King
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