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

[Rik van Riel]

On 05/11/2012 05:11 PM, Satoru Moriya wrote:
> On 04/20/2012 08:21 PM, Satoru Moriya wrote:
> > Ah yes, it is not so small now.
> > On 4GB server, without THP min_free_kbytes is 8113 but with THP it is
> > 67584.
> >
> > How about using low watermark or min watermark?
> > Are they still big?
> >
> > ...or should we use other value?
>
> What do you think of the idea above?

I believe that using the high watermark is just fine.

We want to start swapping, before the page cache is so
small that we start thrashing from that.

> So, I propose that we start with applying this patch first
> and then discuss/improve the threshold.
>
> The patch may not be perfect but, at least, we can improve
> the kernel behavior in the enough filebacked memory case
> with this patch. I believe it's better than nothing.

Agreed.

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