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Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback |
Date: |
Mon, 20 Feb 2012 14:29:11 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1 |
On 02/20/2012 04:32 AM, Gerd Hoffmann wrote:
> Hmm, that is pretty lame. There are users like autotest which expect
> the screen dump being there when the monitor command is finished, that
> change will break them.
Libvirt is another such user.
>
> Unfortunaly there is no easy way out. I think the options are:
>
> (1) Keep existing behavior. That means the screenshot might show old
> screen content. Not very nice too. Would work sort-of ok for
> autotest though as autotest does screenshots every second and thus
> the screen content wouldn't be older than a second.
>
> (2) Async monitor command. Keeps interface and works nicely. A bunch
> of QAPI bits tickled into master meanwhile, so we could look at
> this again. Luiz? What is the status here?
>
> (3) Something like this patch + additionally introduce a
> "your-screenshot-is-finished-now" qmp event. Will break existing
> users too. But at least they can be adapted without requiring
> some external, nonportable service like inotify ...
Libvirt would want 3) - any command that becomes async also needs an
event to tell us when the command is completed, so that libvirt can
maintain the synchronous interface to the user (and/or expose a new flag
to allow the user to also benefit from the asynchronous command).
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, (continued)
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Gerd Hoffmann, 2012/02/20
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Alon Levy, 2012/02/20
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Gerd Hoffmann, 2012/02/21
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Alon Levy, 2012/02/21
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Gerd Hoffmann, 2012/02/21
- Re: [Qemu-devel] [RFC 7/7] qxl: add allocator, Alon Levy, 2012/02/21
[Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/19
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Gerd Hoffmann, 2012/02/20
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback,
Eric Blake <=
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/21
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Eric Blake, 2012/02/21
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/21
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Luiz Capitulino, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Luiz Capitulino, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Gerd Hoffmann, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Luiz Capitulino, 2012/02/22
- Re: [Qemu-devel] [RFC 5/7] qxl-render: call ppm_save on callback, Alon Levy, 2012/02/22