Re: [RFC][PATCH] O(1) Entitlement Based Scheduler

[Nuno Silva]

Timothy Miller wrote:

[..]

> It's a security concern to have to login as root unnecessarily.  It's 
> bad enough we have to do that to change X11 configuration, but we 
> shouldn't have to do that every time we want to start xmms.  And just 
> suid root is also a security concern.

Maybe I'm missing something, but xmms run OK with zero load, right? The 
problem is that, when building the kernel and the entire kde tree, each 
with make -j 16, xmms skips a few times? Well, tough luck...

And the user *can* do something about it, just nice -n 19 the builds and 
left xmms alone. (Or you can use other player... :-)

With this patch you can even say that each of the build processes can 
only hog 5% (at the most!) of the CPU (maybe the build is not a good 
example for mandatory CPU time caps, but it is usefull).

Besides, this implements a true run-only-when-noone-else-wants-to-run 
nice mode wich, combined with the absolut cpu time caps, hits some of my 
wish list for a complete scheduler :-) so I can't wait to test it :-)

A final note to John Lee: you may want to check the Class-based Kernel 
Resource Management (CKRM) at:
	http://ckrm.sourceforge.net/

Thanks,
Nuno Silva



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