[uml-devel] Current state of UML

[Jeff Garzik <jgarzik@pobox.com>]

Just a FWIW...

Using the latest UML code in 2.6.x BitKeeper (2.6.9-rc1-bk), things are 
looking pretty darn good.  I was able to boot a Fedora Core userland 
with "init=/bin/sh", set up networking easily [uml_net helper worked], 
and ssh into my virtual host.

To problems, one major and two minor:

(major)
1) Using standard Fedora Core SysvInit, rc.sysinit will proceed to 
completion, then the userland boot halts.  ps shows the virtual host's 
/sbin/init process in constant run state, chewing CPU time like mad. 
Didn't investigate further, simply booted with init=/bin/sh and moved on.

(minor)
2) The Makefiles appear to add "-um1" to the kernel version for some 
reason, and IMHO violates the Principle of Least Surprise.  This breaks 
several of my scripts :(

3) The arch/um build is verbose, showing each gcc command line as it is 
executed.  This is incorrect when KBUILD_VERBOSE or similar setting are 
not enabled.  As a result, the arch/um is verbose, but the rest is not, 
by default.

Overall I am really impressed.  Like other arches in the Linux kernel, 
it is IMO very important to be able to work "out of the box", without 
patches.

	Jeff





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