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Date: Wed, 14 Mar 2012 10:14:31 -0300
From: Luiz Capitulino <lcapitulino@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH/RFC 0/7] Screendump to UNIX socket & in PNG
 format
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To: Kevin Wolf <kwolf@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org, =?ISO-8859-1?B?TWFyYy1BbmRy6Q==?= Lureau <mlureau@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, =?ISO-8859-1?B?TWFyYy1BbmRy6Q==?= Lureau <marcandre.lureau@redhat.com>, =?ISO-8859-1?B?TWFyYy1BbmRy6Q==?= Lureau <marcandre.lureau@gmail.com>

On Wed, 14 Mar 2012 12:42:36 +0100
Kevin Wolf <kwolf@redhat.com> wrote:

> Am 14.03.2012 10:42, schrieb Stefan Hajnoczi:
> > On Tue, Mar 13, 2012 at 1:17 PM, Gerd Hoffmann <kraxel@redhat.com> wrot=
e:
> >>  Hi,
> >>
> >>> If you want to do it as part of the QEMU codebase then a thread is
> >>> probably the best way - it avoids the troubles of forking a
> >>> multithreaded program and letting go of resources (guest memory, file
> >>> descriptors) that aren't needed across fork.
> >>
> >> That pretty much requires async monitor command support though, so the
> >> iothread can continue driving guest i/o while the new worker thread
> >> scales/compresses/writes the screendump.
> >=20
> > The most practical first step would be simply sending the ppm over a
> > socket from ppm_save().  The 'screendump' command today already blocks
> > so no new badness is being added.  There would be no threads or fancy
> > image encoding.
>=20
> Saving PNGs would be useful even without a management tool.

=46rom HMP you mean? This should be possible, the HMP implementation could
save the image received via fd to a file.