linux-kernel - RE: la la la la ... swappiness

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Message-Id: <200612041439.kB4EdGFn025092@ms-smtp-03.texas.rr.com>
Date:	Mon, 4 Dec 2006 08:39:24 -0600
From:	"Aucoin" <Aucoin@...ston.RR.com>
To:	"'Kyle Moffett'" <mrmacman_g4@....com>
Cc:	"'Tim Schmielau'" <tim@...sik3.uni-rostock.de>,
	"'Andrew Morton'" <akpm@...l.org>, <torvalds@...l.org>,
	<linux-kernel@...r.kernel.org>, <clameter@....com>
Subject: RE: la la la la ... swappiness

 > PS: No need to put a copy of the entire message

Apologies for the lapse in protocol.

> The point you're missing is that an "inactive" page is a free 
> page that happens to have known clean data on it 

I understand now where the inactive page count is coming from.
I don't understand why there is no way for me to make the kernel
prefer to reclaim inactive pages before choosing swap.

> In this case you're telling the kernel to go beyond its 
> normal housekeeping and delete perfectly good data from 
> memory.  The only reason to do that is usually to make 

The definition of perfectly good here may be up for debate or
someone can explain it to me. This perfectly good data was
cached under the tar yet hours after the tar has completed the
pages are still cached.

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