On 01/17/2012 07:18 PM, KAMEZAWA Hiroyuki wrote:

On Wed, 18 Jan 2012 08:08:01 +0900
Minchan Kim[off-list ref]  wrote:

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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.

I think you are getting hung up on a word here.

As I understand it, the goal is to push out the point where
we start doing heavier swap IO, allowing us to overcommit
memory more heavily before things start really slowing down.

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