[PATCH] xkb: Check and load precompiled .xkm during startup if available

Mikhail Gusarov dottedmag at dottedmag.net
Mon Mar 15 23:04:53 PDT 2010

Twas brillig at 10:12:14 16.03.2010 UTC+10 when peter.hutterer at who-t.net did gyre and gimble:

 >> New 'precompiled' subdir is added to xkb data dir, allowing to
 >> pre-compile keymaps to be loaded when server starts and hence avoid
 >> running xkbcomp, saving a bit of time.

 PH> Good idea. Do you have any numbers on how much time this actually
 PH> saves?

I can't measure it -- see below.

 PH> IIRC we only run xkbcomp once at the moment and then re-used the
 PH> cached values.  Is skipping this one run beneficial?

Not for my case, I don't have xkbcomp at all, as it needs Xlib (which I
managed to avoid entirely so far).

 PH> What happens if xkeyboard-config is updated after an xkm has been
 PH> precompiled? Do the users need to recompile? This is my main worry,
 PH> it'll make triaging of nonworking keyboard layouts quite tricky.

Yes. Probably this need to be handled, so it was more RFC actually, than
actual patch.

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