linux-kernel - Re: userspace pagecache management tool

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Message-Id: <20070303203556.8648c9a2.akpm@linux-foundation.org>
Date:	Sat, 3 Mar 2007 20:35:56 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Lee Revell" <rlrevell@...-job.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: userspace pagecache management tool

On Sat, 3 Mar 2007 21:35:59 -0500 "Lee Revell" <rlrevell@...-job.com> wrote:

> On 3/3/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > But yes, updatedb's pagecache usage will be mainly metadata, and this tool
> > doesn't address metadata pagecache, although it could do so.
> >
> 
> With no kernel changes?  How?  I can't find an equivalent API to
> posix_fadvise() for metadata.
> 

We can use mincore and fadvise against /dev/sda1, too.

mincore's linear search would hurt but you could just run fadvise
regularly.  A lot of the blockdev pagecache is pretty useless anyway: we've
already copied it much of it into dentries and inodes, and some of ext2/3/4's
pagecache is already pinned by the fs.

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