[Lse-tech] NUMA inter-node load balance

[Monica C. <mc...@in...>]

Hi, I'm a brazilian student and my research area is scalable operating=20
systems. Currently, I'm studing the kernel 2.6.7 scheduler (specially=20
for NUMA systems) and I din't find where inter-node load balance is=20
done. There was a routine called balance_node in sched.c file in kernel=20
2.6.5, but in version 2.6.7 the scheduler works with scheduler domains=20
and CPU groups.
I read the sched.c code and I think the load balance is done for=20
specific scheduler domain's CPU groups, but in the=20
arch_init_sched_domains routine the highest level scheduler domain=20
created is node scheduler domain. So, I can't understand how and when=20
the inter-node load balance is performed. Is there a scheduler domain=20
for the entire system? Where is it set up?

Sorry if this is a stupid question, I'm just a beginner and the Linux=20
scheduler don=B4t have a good documentation, so I decided to ask to you.

Sorry too my terrible english and thank very much if someone read all=20
this message! :)

I hope to receive an answer...

Thanks again.

Monica