Re: [RFC] 2.3.39 zone balancing

[Peter Rival <frival@zk3.dec.com>]

Sorry to be late on this thread...

Ingo Molnar wrote:

> On Thu, 13 Jan 2000, Kanoj Sarcar wrote:
>
> > There's been some arguments against per-zone, or per-node kswapd's,
> > so the other alternative is to pass the list of unbalanced zones to
> > kswapd, which can then scan only the unbalanced ones. This is the
> > best solution when there are fairly large number of nodes.
>
> the current kswapd is not quite suited to go per-zone and/or per-node, i
> agree. But the swap_out() logic itself i believe has to be per-node in the
> long term. Especially as we are already able to allocate from a given
> node. Thus it would be natural to be able to do swap_out() from a given
> node - both page tables and pages will likely be bound to a node. Per-node
> kswapds are simple - they only have to take a look at p->node or
> p->processor to pick up the right mm. This means that every kswapd would
> pick up preferred mm's from it's own node.
>

Just don't forget about memory-only nodes (i.e., don't use p->processor :)

 - Pete

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