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SubjectRe: [RFC][PATCH] page reclaim throttle take2
On Wed, 27 Feb 2008, Balbir Singh wrote:

> Let's forget node hotplug for the moment, but what if someone
> 1. Changes the machine configuration and adds more nodes, do we expect the
> kernel to be recompiled? Or is it easier to update /etc/sysctl.conf?
> 2. Uses fake NUMA nodes and increases/decreases the number of nodes across
> reboots. Should the kernel be recompiled?

That is why the proposal was made to make this a static configuration
option, such as CONFIG_NUM_RECLAIM_THREADS_PER_NODE, that will handle both

> I am afraid it doesn't. Consider as you scale number of CPU's with the same
> amount of memory, we'll end up making the reclaim problem worse.

The benchmark that have been posted suggest that memory locality is more
important than lock contention, as I've already mentioned.


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