On Mittwoch 18 November 2009, Alan McKinnon wrote: > On Wednesday 18 November 2009 01:16:04 Stefan G. Weichinger wrote: > > Volker Armin Hemmann schrieb: > > > Namespaces - you don't need it? Kick 'em out. > > > > hmm, interesting ... ;-) > > > > for sure I also want to decrapify my kernel-config ... > > > > To disable namespaces I would have to set CONFIG_EMBEDDED=y ... correct? > > > > This is rather counterintuitive to me, as my main workstation is far > > from an embedded or small system (ok, not compared to the > > 4096-cpu-clusters in http://xkcd.com/619/ , but compared to, for > > example, my embedded ALIX-PC I use as fw/router/something ...). > > > > So you suggest I set CONFIG_EMBEDDED=y and in turn get several new > > options/defaults to choose and get right or wrong ... ? > > > > ;-) > > > > I am quite sure to have at least *some* crap in my config as I tend to > > always do something like > > > > zcat /proc/config.gz >> /usr/src/linux-new-shiny-version/.config > > make oldconfig > > > > .... > > > > This gives me expected results and a "it boots OK" experience, getting > > rid of unused crap is another issue, yes. > > > > I wonder which EMBEDDED options would help me ... > > Likely none of them. > > The embedded menu is the most counter-intuitive thing in the whole kernel > config. It does not supply a list of things you may enable, instead it > activates a menu that allows you to switch stuff OFF that is normally ON. > > The rationale is that embedded devices need to get by on a very slim kernel > and with some magic trickery they can successfully disable some features > that are usually considered perfectly normal for regular desktop use. > > For example: CONFIG_HOTPLUG. It's unthinkable to remove this for a desktop, > but does your TomTom need it? Does a GPS even have hotplug facilities? How > about ADSL router/modems? > > To disable namespace, enable embedded, leave everything on, and you will > find you can now disable namespaces. >
you can disable: - Enable 16-bit UID system calls - Sysctl syscall support without negative impact on a desktop. Most of it is broken for years anyway. - Core dumps are another feature that most people never use - Load all symbols for debugging/ksymoops and - Do an extra kallsyms pass stuff you can deactivate if you don't plan to send crash reports. - Enable PC-Speaker support oh hell - away with that one! Who needs beeps anyway?
