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Re: [Qemu-devel] linux guests and ksm performance
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] linux guests and ksm performance |
Date: |
Tue, 28 Feb 2012 15:14:07 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 |
On 02/23/2012 06:42 PM, Stefan Hajnoczi wrote:
> On Thu, Feb 23, 2012 at 3:40 PM, Peter Lieven <address@hidden> wrote:
> > However, in a virtual machine I have not observed the above slow down to
> > that extend
> > while the benefit of zero after free in a virtualisation environment is
> > obvious:
> >
> > 1) zero pages can easily be merged by ksm or other technique.
> > 2) zero (dup) pages are a lot faster to transfer in case of migration.
>
> The other approach is a memory page "discard" mechanism - which
> obviously requires more code changes than zeroing freed pages.
>
> The advantage is that we don't take the brute-force and CPU intensive
> approach of zeroing pages. It would be like a fine-grained ballooning
> feature.
>
> I hope someone will follow up saying this has already been done or
> prototyped :).
It already exists - that's the balloon code. Right now it's host
driven, but maybe we can modify it to allow the guest to initiate
balloon inflations.
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] linux guests and ksm performance, (continued)
- Re: [Qemu-devel] linux guests and ksm performance, address@hidden, 2012/02/23
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Stefan Hajnoczi, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/24
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
- Message not available
- Message not available
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
- Re: [Qemu-devel] linux guests and ksm performance, Avi Kivity, 2012/02/28
- Re: [Qemu-devel] linux guests and ksm performance, Peter Lieven, 2012/02/28
Re: [Qemu-devel] linux guests and ksm performance, Gleb Natapov, 2012/02/24
Re: [Qemu-devel] linux guests and ksm performance,
Avi Kivity <=