Re: [patch 2/2] sched: Scale the nohz_tracker logic by making itper NUMA node

[Peter Zijlstra]

On Thu, 2009-12-10 at 17:27 -0800, venkatesh.pallipadi@xxxxxxxxx wrote:
> Having one idle CPU doing the rebalancing for all the idle CPUs in
> nohz mode does not scale well with increasing number of cores and
> sockets. Make the nohz_tracker per NUMA node. This results in multiple
> idle load balancing happening at NUMA node level and idle load balancer
> only does the rebalance domain among all the other nohz CPUs in that
> NUMA node.
> 
> This addresses the below problem with the current nohz ilb logic
> * The lone balancer may end up spending a lot of time doing the
> * balancing on
>   behalf of nohz CPUs, especially with increasing number of sockets and
>   cores in the platform.

If the purpose is to keep sockets idle, doing things per node doesn't
seem like a fine plan, since we're having nodes <= socket machines these
days.



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