From: Jeff Dike <jdike@addtoit.com>
To: Rob Landley <rob@landley.net>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
user-mode-linux-devel@lists.sourceforge.net,
Yasunori Goto <y-goto@jp.fujitsu.com>,
Dave Hansen <haveblue@us.ibm.com>, Ingo Molnar <mingo@elte.hu>,
Mel Gorman <mel@csn.ul.ie>, "Martin J. Bligh" <mbligh@mbligh.org>,
Andrew Morton <akpm@osdl.org>,
kravetz@us.ibm.com, linux-mm <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
lhms <lhms-devel@lists.sourceforge.net>
Subject: [uml-devel] Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19
Date: Thu, 3 Nov 2005 00:26:49 -0500 [thread overview]
Message-ID: <20051103052649.GA16508@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200511021728.36745.rob@landley.net>
On Wed, Nov 02, 2005 at 05:28:35PM -0600, Rob Landley wrote:
> With fragmentation reduction and prezeroing, UML suddenly gains the option of
> calling madvise(DONT_NEED) on sufficiently large blocks as A) a fast way of
> prezeroing, B) a way of giving memory back to the host OS when it's not in
> use.
DONT_NEED is insufficient. It doesn't discard the data in dirty
file-backed pages.
Badari Pulavarty has a test patch (google for madvise(MADV_REMOVE))
which does do the trick, and I have a UML patch which adds memory
hotplug. This combination does free memory back to the host.
Jeff
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next prev parent reply other threads:[~2005-11-03 5:26 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1130917338.14475.133.camel@localhost>
[not found] ` <20051102172729.9E7C.Y-GOTO@jp.fujitsu.com>
[not found] ` <43687C3D.7060706@yahoo.com.au>
2005-11-02 23:28 ` [uml-devel] Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 Rob Landley
2005-11-03 5:26 ` Jeff Dike [this message]
2005-11-03 5:41 ` Rob Landley
2005-11-04 3:26 ` Blaisorblade
2005-11-04 15:50 ` Rob Landley
2005-11-04 17:18 ` Blaisorblade
2005-11-04 17:44 ` Rob Landley
2005-11-04 19:10 ` Blaisorblade
2005-11-04 20:41 ` Rob Landley
2005-11-04 20:57 ` Rob Landley
2005-11-04 23:42 ` Blaisorblade
2005-11-05 1:45 ` Rob Landley
2005-11-05 5:23 ` Jeff Dike
2005-11-05 5:45 ` Jeff Dike
2005-11-05 11:30 ` Blaisorblade
2005-11-05 23:44 ` Rob Landley
2005-11-06 17:18 ` Blaisorblade
2005-11-08 0:32 ` Rob Landley
2005-11-08 15:56 ` Blaisorblade
2005-11-09 0:50 ` Rob Landley
2005-11-05 18:57 ` Rob Landley
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