Re: [RFC][PATCH] avoid swapping out with swappiness==0

[KOSAKI Motohiro]

(4/26/12 10:50 AM), Christoph Lameter wrote:
> On Tue, 24 Apr 2012, Richard Davies wrote:
>
> > I strongly believe that Linux should have a way to turn off swapping unless
> > absolutely necessary. This means that users like us can run with swap
> > present for emergency use, rather than having to disable it because of the
> > side effects.
>
> Agree. And this ooperation mode should be the default behavior given that
> swapping is a very slow and tedious process these days.

Even though current patch is not optimal, I don't disagree this opinion. Can
you please explain your use case? Why don't you use swapoff?

Off topic: I hope linux is going to aim good swap clustered io in future. Especially
when using THP, 4k size io is not really good.

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