Re: [git pull] scheduler fixes

[Ingo Molnar]

* Mike Galbraith <efault@xxxxxx> wrote:

> On Sat, 2009-01-17 at 04:43 -0800, Andrew Morton wrote:
> > http://bugzilla.kernel.org/show_bug.cgi?id=12465 just popped up - another
> > scheduler regression.  It has been bisected.
> 
> Seems pretty clear.  I'd suggest reverting it.

We can revert it (and will revert it if no solution is found), but i'd 
also like to understand why it happens, because that kind of regression 
from this change is unexpected - we might be hiding some bug that could 
pop up under less debuggable circumstances, so we need to understand it 
while we have a chance.

Below is the commit in question. Avi, any ideas what makes KVM special 
here? Perhaps its use of "preempt notifiers" is causing a problem somehow?

	Ingo

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