From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
Cc: Marcelo Tosatti <marcelo-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
kvm-devel
<kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [PATCH] KVM simplified virtio balloon driver
Date: Sat, 19 Jan 2008 09:02:29 +0200 [thread overview]
Message-ID: <4791A085.8060502@qumranet.com> (raw)
In-Reply-To: <200801171245.59510.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
Rusty Russell wrote:
> After discussions with Anthony Liguori, it seems that the virtio
> balloon can be made even simpler. Here's my attempt.
>
> Since the balloon requires Guest cooperation anyway, there seems
> little reason to force it to tell the Host when it wants to reuse a
> page. It can simply fault it in.
>
>
Faulting is synchronous, while deflating is (or can be made)
asynchronous. If the host needs to do some work to get the memory, the
guest will be slowed down considerably.
If we have explicit deflate, the host can call madvise(MADV_WILLNEED) or
actually touch the pages before the guest accesses them.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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next prev parent reply other threads:[~2008-01-19 7:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20080114200357.GA18354@dmt>
[not found] ` <200801151032.09495.rusty@rustcorp.com.au>
[not found] ` <20080115190102.GA27645@dmt>
2008-01-16 23:12 ` [PATCH] KVM virtio balloon driver Dor Laor
[not found] ` <1200525166.26281.103.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-01-17 1:45 ` [PATCH] KVM simplified " Rusty Russell
[not found] ` <200801171245.59510.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-01-17 2:14 ` Anthony Liguori
[not found] ` <478EBA22.30301-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-01-17 3:29 ` Rusty Russell
[not found] ` <200801171429.32888.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-01-17 4:01 ` Anthony Liguori
[not found] ` <478ED32A.1060803-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-01-17 5:59 ` Rusty Russell
2008-01-19 7:05 ` Avi Kivity
2008-01-17 9:32 ` Christian Borntraeger
[not found] ` <200801171032.26198.borntraeger-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
2008-01-17 10:25 ` Martin Schwidefsky
2008-01-17 11:40 ` Dor Laor
2008-01-17 13:56 ` Anthony Liguori
[not found] ` <478F5E85.9020009-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-01-17 23:01 ` Dor Laor
[not found] ` <1200610891.26281.171.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-01-17 23:35 ` Anthony Liguori
2008-01-19 7:02 ` Avi Kivity [this message]
[not found] ` <4791A085.8060502__30665.5007684187$1200726687$gmane$org@qumranet.com>
[not found] ` <4791A085.8060502__30665.5007684187$1200726687$gmane$org-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-19 22:37 ` Anthony Liguori
[not found] ` <47927BB7.7060805-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-01-20 0:24 ` Marcelo Tosatti
2008-01-20 0:40 ` Anthony Liguori
[not found] ` <47929884.2010908-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2008-01-24 1:58 ` Rusty Russell
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