linux-kernel - Re: userspace pagecache management tool

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Message-Id: <20070307105035.5f5b31d4.akpm@linux-foundation.org>
Date:	Wed, 7 Mar 2007 10:50:35 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pádraig Brady <P@...igBrady.com>
Cc:	bert hubert <bert.hubert@...herlabs.nl>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: userspace pagecache management tool

On Wed, 07 Mar 2007 11:39:02 +0000 Pádraig Brady <P@...igBrady.com> wrote:

> Andrew Morton wrote:
> > On Tue, 06 Mar 2007 12:10:49 +0000
> > P__draig Brady <P@...igBrady.com> wrote:
> >> Perhaps one could possibly just evict pages with _mapcount==0 ?
> > 
> > That is the present fadvise(FADV_DONTNEED) behaviour.
> 
> Ah right. It doesn't invalidate page_mapped() pages.

yup

> If that means it doesn't invalidate pages previously cached
> by other processes, then great.

It will do that.  This is why I point out that this userspace tool
could (easily) be enhanced to not invalidate pages which were
in pagecache prior to their being read by the managed application.
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