From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Chris Wright <chrisw-69jw2NvuJkxg9hUCZPvPmw@public.gmane.org>
Cc: andrea-atKUWr5tajBWk0Htik3J/w@public.gmane.org,
yaniv-atKUWr5tajBWk0Htik3J/w@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: [RFC][PATCH 0/5] Memory merging driver for Linux
Date: Thu, 24 Jan 2008 07:40:58 +0200 [thread overview]
Message-ID: <479824EA.7070603@qumranet.com> (raw)
In-Reply-To: <20080123231037.GA3629-JyIX8gxvWYPr2PDY2+4mTGD2FQJk+8+b@public.gmane.org>
Chris Wright wrote:
> * Izik Eidus (izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org) wrote:
>
>> this module find this identical data (pages) and merge them into one
>> single page
>> this new page is write protected so in any case the guest will try to
>> write to it do_wp_page will duplicate the page
>>
>
> What happens if you've merged more pages than you can recover on write
> faults?
>
You start to swap. Just like Linux when you start to write on fork()ed
memory.
A management application may start taking measures, like inflating
balloons and migrating to other hosts, but swapping is needed as a last
resort measure.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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next prev parent reply other threads:[~2008-01-24 5:40 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-21 16:05 [RFC][PATCH 0/5] Memory merging driver for Linux Izik Eidus
[not found] ` <4794C2E1.8040607-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-23 17:05 ` Rik van Riel
[not found] ` <20080123120510.4014e382-Fuq27k0DHcCSkoNiqTzCLQ@public.gmane.org>
2008-01-23 17:54 ` Andrea Arcangeli
[not found] ` <20080123175444.GH7141-lysg2Xt5kKMAvxtiuMwx3w@public.gmane.org>
2008-01-23 18:11 ` Izik Eidus
2008-01-24 5:38 ` Avi Kivity
2008-01-23 23:10 ` Chris Wright
[not found] ` <20080123231037.GA3629-JyIX8gxvWYPr2PDY2+4mTGD2FQJk+8+b@public.gmane.org>
2008-01-24 5:40 ` Avi Kivity [this message]
[not found] ` <479824EA.7070603-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-24 9:26 ` Izik Eidus
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