環境変数のCONCURRENCY_LEVELに数字を入れておくと並列makeをしてくれるようだ。
man make-kpkg
If defined, this environment variable sets the concurrency level of make used to compile the kernel and
the modules set using -j flags to the sub make in the build target of make-kpkg.
力技より良さそう。
未検証
参考
ccache な make-kpkg
http://blog.11n.jp/archives/205
time CONCURRENCY_LEVEL=4 MAKEFLAGS="CC=ccache\ gcc" fakeroot make-kpkg -append_to_version -3-noch-i686 -revision=1 -initrd kernel-image -config menuconfig
http://distcc.samba.org/faq.html
make-kpkg with distcc?
How to compile the debian kernel with make-kpkg using distcc?
Use the CONCURRENCY_LEVEL environment variable eg make-kpkg kernel_image CONCURRENCY_LEVEL=4 after installing distcc into a masquerade directory.
Implementation-Agnostic Support for Alternative Compilers: ccache, distcc, etc.
https://bugs.launchpad.net/ubuntu/+source/devscripts/+bug/182942
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=460719
