From: Avi Kivity <avi@qumranet.com>
To: Chris Wright <chrisw@sous-sol.org>
Cc: Izik Eidus <izike@qumranet.com>,
kvm-devel <kvm-devel@lists.sourceforge.net>,
andrea@qumranet.com, dor.laor@qumranet.com, linux-mm@kvack.org,
yaniv@qumranet.com
Subject: Re: [kvm-devel] [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@sequoia.sous-sol.org>
Chris Wright wrote:
> * Izik Eidus (izike@qumranet.com) 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 Izik Eidus
2008-01-23 17:05 ` [kvm-devel] " Rik van Riel
2008-01-23 17:54 ` Andrea Arcangeli
2008-01-23 18:11 ` Izik Eidus
2008-01-24 5:38 ` Avi Kivity
2008-01-23 23:10 ` Chris Wright
2008-01-24 5:40 ` Avi Kivity [this message]
2008-01-24 9:26 ` Izik Eidus
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