From: Andy Isaacson <adi@hexapodia.org>
To: "Samuel Thibault" <samuel.thibault@ens-lyon.org>,
"Jörn Engel" <joern@wohnheim.fh-wedel.de>,
"Robert Love" <rml@novell.com>,
linux-kernel@vger.kernel.org
Subject: Re: wrong madvise(MADV_DONTNEED) semantic
Date: Tue, 28 Jun 2005 13:37:07 -0700 [thread overview]
Message-ID: <20050628203707.GD30079@hexapodia.org> (raw)
In-Reply-To: <20050628202053.GO4645@bouh.labri.fr>
On Tue, Jun 28, 2005 at 10:20:53PM +0200, Samuel Thibault wrote:
> Jörn Engel, le Tue 28 Jun 2005 22:17:04 +0200, a écrit :
> > If the application knows 100% that it is the _only_ possible user of
> > this data and will never again use it, dropping dirty pages might be a
> > sane option. Effectively that translates to anonymous memory only.
>
> And private file mappings?
So long as the mapping exists, the data should not disappear. So a
MAP_PRIVATE mapping should behave just like a MAP_SHARED mapping, and
both need to be fixed to not lose data due to madvise(MADV_DONTNEED).
(I agree with Joern, MADV_FREE seems like an ill-advised extension.)
If this means some swap needs to be allocated, well, so be it.
-andy
next prev parent reply other threads:[~2005-06-28 20:38 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-28 13:43 wrong madvise(MADV_DONTNEED) semantic Samuel Thibault
2005-06-28 14:38 ` [Patch] Hotfix for " Jörn Engel
2005-06-28 18:16 ` Andy Isaacson
2005-06-28 18:28 ` Robert Love
2005-06-28 18:53 ` Andy Isaacson
2005-06-28 19:23 ` Robert Love
2005-06-28 19:41 ` Samuel Thibault
2005-06-28 20:03 ` Jörn Engel
2005-06-28 20:05 ` Robert Love
2005-06-28 20:17 ` Jörn Engel
2005-06-28 20:20 ` Samuel Thibault
2005-06-28 20:30 ` Jörn Engel
2005-06-28 20:37 ` Andy Isaacson [this message]
2005-07-05 23:39 ` Darren Hart
2005-06-29 16:53 ` wrong madvise(MADV DONTNEED) semantic Michael Kerrisk
2005-06-29 17:22 ` Jamie Lokier
2005-06-29 16:34 ` Michael Kerrisk
2005-06-28 18:54 ` wrong madvise(MADV_DONTNEED) semantic Samuel Thibault
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