linux-kernel - Re: [PATCH] mm/filemap.c: unconditionally call mark_page

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Message-Id: <200703151737.l2FHb81d001600@turing-police.cc.vt.edu>
Date:	Thu, 15 Mar 2007 13:37:08 -0400
From:	Valdis.Kletnieks@...edu
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
Cc:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	Ashif Harji <asharji@...uwaterloo.ca>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] mm/filemap.c: unconditionally call mark_page_accessed

On Wed, 14 Mar 2007 22:33:17 BST, Andreas Mohr said:

> it'd seem we need some kind of state management here to figure out good
> intervals of when to call mark_page_accessed() *again* for this page. E.g.
> despite non-changing access patterns you could still call mark_page_accessed(
)
> every 32 calls or so to avoid expiry, but this would need extra helper
> variables.

What if you did something like

	if (jiffies%32) {...

(Possibly scaling it so the low-order bits change).  No need to lock it, as
"right most of the time" is close enough.


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