Re: [RFC 2/3] vmscan hook

[KAMEZAWA Hiroyuki]

On Wed, 18 Jan 2012 08:08:01 +0900
Minchan Kim <minchan@xxxxxxxxxx> wrote:

> > 
> > 
> > > > 2. can't we measure page-in/page-out distance by recording something ?
> > > 
> > > I can't understand your point. What's relation does it with swapout prevent?
> > > 
> > 
> > If distance between pageout -> pagein is short, it means thrashing.
> > For example, recoding the timestamp when the page(mapping, index) was
> > paged-out, and check it at page-in.
> 
> Our goal is prevent swapout. When we found thrashing, it's too late.
> 

If you want to prevent swap-out, don't swapon any. That's all.
Then, you can check the number of FILE_CACHE and have threshold.

Thanks,
-Kame

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