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

[Nick Piggin]

Christoph Lameter wrote:
> Only call rebalance_domains when needed from scheduler_tick.
>
> 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...

Ideas were: overlapping, non-covering top level domains, or a
SD_BALANCE_ROTOR, which scans only N (< all) groups on each
balance attempt, but more frequently.

--
SUSE Labs, Novell Inc.
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