linux-kernel - Re: fadvise DONTNEED implementation (or lack thereof)

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Message-ID: <4CE40129.9060103@redhat.com>
Date:	Wed, 17 Nov 2010 11:22:01 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ben Gamari <bgamari.foss@...il.com>,
	linux-kernel@...r.kernel.org, rsync@...ts.samba.org,
	linux-mm@...ck.org, Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: fadvise DONTNEED implementation (or lack thereof)

On 11/17/2010 05:16 AM, Minchan Kim wrote:

> Absolutely. But how about rsync's two touch?
> It can evict working set.
>
> I need the time for investigation.
> Thanks for the comment.

Maybe we could exempt MADV_SEQUENTIAL and FADV_SEQUENTIAL
touches from promoting the page to the active list?

Then we just need to make sure rsync uses fadvise properly
to keep the working set protected from rsync.

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