Messages in this thread | | | Date | Wed, 18 Jan 2012 09:18:24 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [RFC 2/3] vmscan hook |
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On Wed, 18 Jan 2012 08:08:01 +0900 Minchan Kim <minchan@kernel.org> 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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