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