Re: [RFC] CPU controllers?

[Nick Piggin]

Mike Galbraith wrote:
> On Sat, 2006-06-17 at 23:42 -0700, Andrew Morton wrote:
>
> > On Sun, 18 Jun 2006 16:11:18 +1000
> > Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
>
>
> > > Again, I don't care about the solutions at this stage. I want to know
> > > what the problem is. Please?
> >
> > Isolation.  To prevent one group of processes from damaging the performance
> > of other groups, by providing manageability of the resource consumption of
> > each group.  There are plenty of applications of this, not just
> > server-consolidation-via-server-virtualisation.
>
>
> Scheduling contexts do sound useful.  They're easily defeated though, as
> evolution mail demonstrates to me every time it's GUI hangs and I see
> that a nice 19 find is running, eating very little CPU, but effectively
> DoSing evolution nonetheless (journal).  I wonder how often people who
> tried to distribute CPU would likewise be stymied by other resources.

Not entirely infrequently. Which is why it really doesn't seem like
it could be useful from a security point of view without a *huge*
amount of work and complexity... and even from a guaranteed-service
point of view, it still seems (to me) like a pretty big and complex
problem.

As a check box for marketing it sounds pretty cool though, I admit ;)

--
SUSE Labs, Novell Inc.
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