From: "H. Peter Anvin" <hpa@zytor.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
David Woodhouse <dwmw2@infradead.org>,
Jeff Dike <jdike@karaya.com>, Benjamin LaHaise <bcrl@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] Arch option to touch newly allocated pages
Date: Thu, 07 Mar 2002 10:21:50 -0800 [thread overview]
Message-ID: <3C87AFBE.3000104@zytor.com> (raw)
In-Reply-To: <505.1015411792@redhat.com> <E16iecJ-0007Nn-00@the-village.bc.nu> <20020306222149.GC370@elf.ucw.cz>
Pavel Machek wrote:
> Hi!
>
>
>>>You say 'at once'. Does UML somehow give pages back to the host when they're
>>>freed, so the pages that are no longer used by UML can be discarded by the
>>>host instead of getting swapped?
>>>
>>Doesn't seem to but it looks like madvise might be enough to make that
>>happen. That BTW is an issue for more than UML - it has a bearing on
>>running lots of Linux instances on any supervisor/virtualising system
>>like S/390
>>
>
> I just imagined hardware which supports freeing memory -- just do not
> refresh it any more to conserve power ;-))).
>
> Granted, it would probably only make sense in big chunks, like 2MB or
> so... It might make sense for a PDA...
> Pavel
Unlikely. Also, if you're using ECC, then that really screws with you.
However, if it is an issue for more than UML (I still consider the
particular UML case "in case you have a UML on a tmpfs set up by an
idiot admin" completely bogus) then it's another issue. The S/390 issue
is real.
-hpa
next prev parent reply other threads:[~2002-03-07 18:22 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-03 21:12 [RFC] Arch option to touch newly allocated pages Jeff Dike
2002-03-03 22:01 ` Alan Cox
2002-03-03 23:27 ` Jeff Dike
2002-03-03 23:48 ` Alan Cox
2002-03-04 3:16 ` Jeff Dike
2002-03-04 3:35 ` Alan Cox
2002-03-04 5:04 ` Jeff Dike
2002-03-04 15:09 ` Alan Cox
2002-03-04 17:42 ` Jeff Dike
2002-03-04 18:29 ` Alan Cox
2002-03-04 18:36 ` Jeff Dike
2002-03-04 18:49 ` Alan Cox
2002-03-04 20:46 ` Jeff Dike
2002-03-04 22:49 ` Alan Cox
2002-03-04 17:46 ` H. Peter Anvin
2002-03-04 18:34 ` Jeff Dike
2002-03-04 18:33 ` H. Peter Anvin
2002-03-04 20:36 ` Jeff Dike
2002-03-04 22:51 ` Alan Cox
2002-03-05 4:15 ` Jeff Dike
2002-03-05 4:28 ` Benjamin LaHaise
2002-03-05 4:40 ` Jeff Dike
2002-03-05 5:34 ` H. Peter Anvin
2002-03-05 14:43 ` Jeff Dike
2002-03-05 16:37 ` H. Peter Anvin
2002-03-05 16:56 ` Wayne Whitney
2002-03-05 18:12 ` Jeff Dike
2002-03-05 18:30 ` Benjamin LaHaise
2002-03-06 14:59 ` Daniel Phillips
2002-03-06 15:24 ` Benjamin LaHaise
2002-03-06 15:24 ` Daniel Phillips
2002-03-06 16:36 ` Benjamin LaHaise
2002-03-06 23:14 ` Daniel Phillips
2002-03-06 23:20 ` Benjamin LaHaise
2002-03-06 23:26 ` Daniel Phillips
2002-03-06 23:33 ` H. Peter Anvin
2002-03-07 0:08 ` Daniel Phillips
2002-03-07 1:27 ` Jeff Dike
2002-03-07 1:52 ` Benjamin LaHaise
2002-03-08 19:17 ` Jeff Dike
2002-03-08 21:22 ` Benjamin LaHaise
2002-03-07 13:49 ` Alan Cox
2002-03-07 13:36 ` Daniel Phillips
2002-03-07 14:04 ` yodaiken
2002-03-07 14:21 ` Daniel Phillips
2002-03-07 14:38 ` yodaiken
2002-03-07 15:31 ` Daniel Phillips
2002-03-07 16:50 ` yodaiken
2002-03-07 18:07 ` Daniel Phillips
2002-03-07 18:15 ` yodaiken
2002-03-07 19:22 ` Alan Cox
2002-03-07 22:43 ` David Woodhouse
2002-03-07 23:09 ` Alan Cox
2002-03-07 22:57 ` David Woodhouse
2002-03-07 14:43 ` Alan Cox
2002-03-07 15:32 ` Daniel Phillips
2002-03-07 16:19 ` Alan Cox
2002-03-07 17:54 ` Daniel Phillips
2002-03-07 15:34 ` Daniel Phillips
2002-03-07 19:18 ` Andrew Morton
2002-03-07 20:10 ` Rik van Riel
2002-03-07 20:56 ` Andrew Morton
2002-03-07 21:23 ` Rik van Riel
2002-03-07 22:02 ` Andrew Morton
2002-03-07 22:10 ` Rik van Riel
2002-03-07 22:23 ` Andrew Morton
2002-03-07 22:27 ` Rik van Riel
2002-03-07 22:41 ` Andrew Morton
2002-03-07 22:42 ` David Lang
2002-03-06 16:03 ` Jesse Pollard
2002-03-06 17:08 ` Jeff Dike
2002-03-06 17:33 ` Alan Cox
2002-03-07 0:28 ` Jeff Dike
2002-03-07 0:44 ` Alan Cox
2002-03-05 18:46 ` H. Peter Anvin
2002-03-06 1:30 ` Alan Cox
2002-03-06 10:49 ` David Woodhouse
2002-03-06 14:26 ` Jeff Dike
2002-03-06 16:50 ` Alan Cox
2002-03-06 20:25 ` Jeff Dike
2002-03-06 20:54 ` Alan Cox
2002-03-06 21:27 ` Malcolm Beattie
2002-03-06 23:26 ` Jeff Dike
2002-03-06 21:27 ` David Woodhouse
2002-03-06 22:25 ` Joseph Malicki
2002-03-07 0:04 ` Richard Gooch
2002-03-07 0:28 ` Jeff Dike
2002-03-07 0:44 ` Alan Cox
2002-03-06 22:21 ` Pavel Machek
2002-03-07 11:30 ` Dave Jones
2002-03-07 18:21 ` H. Peter Anvin [this message]
2002-03-05 14:43 ` Jeff Dike
2002-03-05 16:57 ` H. Peter Anvin
2002-03-05 18:14 ` Jeff Dike
2002-03-05 18:45 ` H. Peter Anvin
2002-03-05 17:30 ` Jan Harkes
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