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