linux-kernel - Re: [RFC 2/3] vmscan hook

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Message-Id: <20120118091824.0bde46f7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 18 Jan 2012 09:18:24 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Minchan Kim <minchan@...nel.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	leonid.moiseichuk@...ia.com, penberg@...nel.org,
	Rik van Riel <riel@...hat.com>, mel@....ul.ie,
	rientjes@...gle.com, KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ronen Hod <rhod@...hat.com>
Subject: Re: [RFC 2/3] vmscan hook

On Wed, 18 Jan 2012 08:08:01 +0900
Minchan Kim <minchan@...nel.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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