Re: [PATCH 5/5] Only call rebalance_domains when needed from scheduler_tick

[Nick Piggin]

Christoph Lameter wrote:
> On Thu, 26 Oct 2006, Nick Piggin wrote:
>
>
> > > Call rebalance_domains from a tasklet with interrupt enabled.
> > > Only call it when one of the sched domains is to be rebalanced.
> > > The jiffies when the next balancing action is to take place is
> > > kept in a per cpu variable next_balance.
> >
> > sched-domains was supposed to be able to build a whacky topology
> > so you didn't have to take the occasional big latency hit when
> > scanning 512 CPUs...
>
>
> How is that supposed to work? The load calculations will be off
> in that case and also the load balancing algorithm wont work anymore. 
> This is going to be a pretty significant rework of how the scheduler 
> works but given the problems with pinned tasks... maybe that is 
> necessary?
> duler?

What will the problem be? Sure it may pull tasks fom one group to
another when both could actually be pulling from a third, but it
the load balancing algorithm should work fine and not require any
rework.

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SUSE Labs, Novell Inc.
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