Re: [PATCH] remove compaction from kswapd

[Andrea Arcangeli <aarcange@redhat.com>]

On Wed, Mar 02, 2011 at 07:33:13AM +0900, Minchan Kim wrote:
> Sorry for bothering you but I think you get the data.
> It helps someone in future very much to know why we determined to
> remove the feature at that time and they should do what kinds of
> experiment to prove it has a benefit to add compaction in kswapd
> again.

This is a benchmark I'm unsure if it's ok to publish results but it
should be possible to simulate it with a device driver.

Arthur provided kswapd load usage data too, so I hope that's enough.

My other patch (compaction-kswapd-3) is way better than current logic
and retains compaction in kswapd. That shows slightly higher
kswapd utilization with Arthur's multimedia workload, and a bit worse
performance on the network benchmark. So I thought it was better to go
with the fastest potion as long as we don't have a logic that uses
compaction and shows improved performance and lower latency than with
no compaction at all in kswapd.

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