From: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
To: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@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 16:37:43 -0600 [thread overview]
Message-ID: <47927BB7.7060805@codemonkey.ws> (raw)
In-Reply-To: <4791A085.8060502__30665.5007684187$1200726687$gmane$org-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Avi Kivity wrote:
> 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.
Good point. Basically, we have two page hinting operations which
roughly correspond to madvise(MADV_DONTNEED) and madvise(MADV_WILLNEED).
Regards,
Anthony Liguori
> If we have explicit deflate, the host can call madvise(MADV_WILLNEED) or
> actually touch the pages before the guest accesses them.
>
>
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next prev parent reply other threads:[~2008-01-19 22:37 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-14 20:03 [PATCH] KVM virtio balloon driver Marcelo Tosatti
2008-01-14 21:29 ` Anthony Liguori
2008-01-15 14:22 ` Marcelo Tosatti
2008-01-14 23:32 ` Rusty Russell
2008-01-15 19:01 ` Marcelo Tosatti
2008-01-16 23:12 ` Dor Laor
[not found] ` <1200525166.26281.103.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-01-17 1:45 ` [PATCH] KVM simplified " Rusty Russell
2008-01-17 2:14 ` [kvm-devel] " Anthony Liguori
[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
2008-01-17 4:01 ` [kvm-devel] " Anthony Liguori
[not found] ` <200801171429.32888.rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
2008-01-17 4:01 ` Anthony Liguori
2008-01-17 5:59 ` [kvm-devel] " Rusty Russell
2008-01-19 7:05 ` Avi Kivity
[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 3:29 ` [kvm-devel] " Rusty Russell
2008-01-17 9:32 ` Christian Borntraeger
2008-01-17 10:25 ` Martin Schwidefsky
[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 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
2008-01-17 23:35 ` Anthony Liguori
[not found] ` <1200610891.26281.171.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2008-01-17 23:35 ` Anthony Liguori
2008-01-17 23:01 ` Dor Laor
2008-01-19 7:02 ` Avi Kivity
2008-01-17 9:32 ` Christian Borntraeger
2008-01-19 7:02 ` [kvm-devel] " Avi Kivity
2008-01-19 22:37 ` Anthony Liguori
2008-01-19 22:37 ` Anthony Liguori
[not found] ` <4791A085.8060502__30665.5007684187$1200726687$gmane$org-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-19 22:37 ` Anthony Liguori [this message]
[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
2008-01-24 1:58 ` [kvm-devel] " Rusty Russell
2008-01-20 0:40 ` Anthony Liguori
2008-01-20 0:24 ` Marcelo Tosatti
2008-01-17 1:45 ` Rusty Russell
2008-01-16 23:12 ` [PATCH] KVM " Dor Laor
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