Re: MM VM patches was: 2.6.3-mm4

[Nick Piggin]

Nick Piggin wrote:

> There are a few things backed out now in 2.6.4-rc1-mm1, and quite a
> few other changes. I hope we can trouble you to test 2.6.4-rc1-mm1?
>
> Tell me, do you have highmem enabled on this system? If so, swapping
> might be explained by the batching patch. With it, a small highmem
> zone could possibly place quite a lot more pressure on a large
> ZONE_NORMAL.
>
> 2.6.4-rc1-mm1 sould do much better here.


Gah no. It would have the same problem actually, if that is indeed
what is happening.

It will take a bit more work to solve this in rc1-mm1. You would
probably want to explicitly use incremental min limits for kswapd.

(background info in kswapd-avoid-higher-zones.patch)

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