On 07/01/2011 11:49 AM, David Quigley wrote: > On Fri, 01 Jul 2011 16:01:32 +0100, agraham wrote: >> On 07/01/2011 04:12 AM, Dave Quigley wrote: >>> Hello, >>> I will be teaching a one day class in a few weeks and I am >>> going to >>> have the students do some kernel programming. Since it is only a one >>> day >>> course I need to pack as much info into it as possible so I would >>> like >>> to minimize the build times as much as possible. The modifications >>> that >>> they will be making will be touching core kernel headers so it will >>> have >>> to rebuild almost all of the kernel every time. Because of this I'd >>> like >>> to get a kernel config that can get F14 booting (the minimal >>> install) in >>> KVM with the shortest build time possible. I've gotten the build >>> down to >>> 9 minutes and 55 seconds but I would like it sub 5 minutes. Does >>> anyone >>> have or know of a place where I can find a bare minimum config. I've >>> been working on trimming down the stock F14 kernel but there is so >>> much >>> to go through I'm thinking it might be best to build it up from an >>> allnoconfig instead. >>> >>> Dave >> When making the kernel use make -j8 (assuming you have 8 cores) that >> should reduce your time by running 8 parallel processes, in addition, >> install ccache, that only compiles the code if it has changed or is >> dependant on some other change, this should result in recompile of >> only >> a few mins. >> >> Albert. > I doubt that people will be allocating 8 cores to a VM. I have 2 cores > and 1GB of memory allocated at the moment and use -j3 to compile. The > problem is they will be touching security.h which in one way or another > is pretty much included by every source file in the Linux kernel so > ccache won't be of much help (my normal dev box has ccache installed and > it doesn't save me much time). The biggest way to cut down on time seems > to be remove all the drivers that I can from being built. I think I have > this almost complete. It would be nice if there was a make kvmconfig > which gave you the base for an x86 or x86_64 kvm kernel config and then > you can turn on whatever else you want filesystem and driver wise for > passthrough devices. > > Dave > Maybe you could try building allmodconfig, then boot the kernel and lsmod to see what has been loaded. Then disable everything except for those modules. --Eamon -- Eamon Walsh National Security Agency -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
