Thanks for clearing that up for me, Philipp, that saved some time in figuring out what I was doing wrong....:-)
I've upgraded our zPDT box here to the latest IBM version so it now supports the instructions, etc. of the new IBM EC12 systems, and I'd like to try building Debian in that environment. What's involved in doing a complete Debian build on the s390x architecture? Thanks and have a good weekend, too. DJ On 10/25/2012 05:17 PM, Philipp Kern wrote: > Hi, > > On Tue, Oct 23, 2012 at 08:45:25PM -0700, Jonathan Nieder wrote: >> Dave Jones wrote: >>> Can the wheezy s390x kernel be saved as an NSS? If so, how? >> Based on [1], it looks like the answer is currently no, based on the >> following line in the kernel config file: >> >> # CONFIG_SHARED_KERNEL is not set >> >> The description of that option says >> >> Select this option, if you want to share the text segment of the >> Linux kernel between different VM guests. This reduces memory >> usage with lots of guests but greatly increases kernel size. >> >> You can build a custom kernel using that option if you wish. It works >> like this[2]: >> >> $ apt-get source linux >> # apt-get install build-essential fakeroot >> # apt-get build-dep linux >> $ cd linux-<version> >> $ fakeroot debian/rules source >> $ fakeroot make -f debian/rules.gen setup_s390_none_s390x > > as we're talking about s390x here that would be setup_s390x_none_s390x. > >> $ cd debian/build/build_s390_none_s390x > > Same here. > >> $ scripts/config --disable DEBUG_INFO >> $ scripts/config --enable SHARED_KERNEL > > That's «../source_none/scripts/config». > >> $ cd ../../.. >> $ fakeroot make -f debian/rules.gen binary-arch_s390_none_s390x > > And again s390x_none_s390x instead of s390_none_s390x. > > I just did the recompilation. AFAICS the kernel size is indeed increased quite > a bit. We currently have: > > -rw-r--r-- root/root 6303232 2012-10-22 15:36 ./boot/vmlinuz-3.2.0-4-s390x > > With SHARED_KERNEL on and DEBUG_INFO off as above: > > -rw-r--r-- root/root 7945728 2012-10-25 21:53 ./boot/vmlinuz-3.2.0-4-s390x > > So a NSS shareable kernel is 1.26 times larger than a plain one. And I fear > that the additional bits cannot be discarded at runtime neither, but I cannot > test this right now. > > Interestingly enough the kernel is already in its plain form 2.23 times bigger > than an amd64 build of vmlinuz-3.2.0-3-amd64. > > Kind regards > Philipp Kern > >> [1] http://www.vm.ibm.com/linux/linuxnss.html >> [2] http://kernel-handbook.alioth.debian.org/ch-common-tasks.html > > -- Dave Jones V/Soft Software www.vsoft-software.com Houston, TX 281.578.7544 -- To UNSUBSCRIBE, email to debian-s390-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/50942c03.2030...@vsoft-software.com
