From: Dan Magenheimer <dan.magenheimer@oracle.com>
To: Jamie Lokier <jamie@shareable.org>
Cc: chris.mason@oracle.com, viro@zeniv.linux.org.uk,
akpm@linux-foundation.org, adilger@sun.com, tytso@mit.edu,
mfasheh@suse.com, joel.becker@oracle.com, matthew@wil.cx,
linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
ocfs2-devel@oss.oracle.com, linux-mm@kvack.org,
ngupta@vflare.org, jeremy@goop.org, JBeulich@novell.com,
kurt.hackel@oracle.com, npiggin@suse.de,
dave.mccracken@oracle.com, riel@redhat.com, avi@redhat.com,
konrad.wilk@oracle.com
Subject: RE: [PATCH V2 0/7] Cleancache (was Transcendent Memory): overview
Date: Wed, 2 Jun 2010 08:35:43 -0700 (PDT) [thread overview]
Message-ID: <312cfff6-7ee7-4a6e-a3fd-fc9b6893f0b1@default> (raw)
In-Reply-To: <20100602130014.GB7238@shareable.org>
> From: Jamie Lokier [mailto:jamie@shareable.org]
> Subject: Re: [PATCH V2 0/7] Cleancache (was Transcendent Memory):
> overview
>=20
> Dan Magenheimer wrote:
> > Most important, cleancache is "ephemeral". Pages which are copied
> into
> > cleancache have an indefinite lifetime which is completely unknowable
> > by the kernel and so may or may not still be in cleancache at any
> later time.
> > Thus, as its name implies, cleancache is not suitable for dirty
> pages. The
> > pseudo-RAM has complete discretion over what pages to preserve and
> what
> > pages to discard and when.
>=20
> Fwiw, the feature sounds useful to userspace too, for those things
> with memory hungry caches like web browsers. Any plans to make it
> available to userspace?
No plans yet, though we agree it sounds useful, at least for
apps that bypass the page cache (e.g. O_DIRECT). If you have
time and interest to investigate this further, I'd be happy
to help. Send email offlist.
Thanks,
Dan
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next prev parent reply other threads:[~2010-06-02 15:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100528173510.GA12166@ca-server1.us.oracle.com>
2010-06-02 6:03 ` [PATCH V2 0/7] Cleancache (was Transcendent Memory): overview Minchan Kim
2010-06-02 15:27 ` Dan Magenheimer
2010-06-02 16:38 ` Minchan Kim
2010-06-02 23:02 ` Dan Magenheimer
2010-06-03 2:46 ` Nitin Gupta
2010-06-03 4:53 ` Andreas Dilger
2010-06-03 6:25 ` Nitin Gupta
2010-06-03 15:43 ` Dan Magenheimer
2010-06-04 9:36 ` Nitin Gupta
2010-06-04 13:45 ` Minchan Kim
2010-06-02 13:00 ` Jamie Lokier
2010-06-02 15:35 ` Dan Magenheimer [this message]
2010-06-02 13:24 ` Christoph Hellwig
2010-06-02 16:07 ` Dan Magenheimer
2010-05-28 17:35 Dan Magenheimer
[not found] <20100528173510.GA12166@ca-server1.us.oracle.comAANLkTilV-4_QaNq5O0WSplDx1Oq7JvkgVrEiR1rgf1up@mail.gmail.com>
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