Re: [Qemu-devel] [Spice-devel] [RFC v4 0/9] qxl: fix hangs caused by qxl_render_update

[Alon Levy]

On Tue, Feb 21, 2012 at 11:39:28PM +0200, Alon Levy wrote:
> This is the second attempt to fix this issue, as a lesson from the last time 
> it doesn't try to use an async monitor command. So with this patchset, in qxl 
> mode, a screendump monitor command will complete before the file is written 
> to disk. This is much better then a hang. To fix it does require asynchronous 
> monitor command completion.
> 
> Changes from previous RFC (v4 to match my internal patches, it's actually the 
> second):
Forgot:
 depend on spice-server >= 0.8.2

Last patch has an ugly hack in the ppm_save bh, that does flipping,
since I missed something somewhere.. Also the whole flipping assumes
that qxl always has negative stride and the displaysurface always has
positive stride, no checks anywhere..

>  - dropped the DisplayAllocator
>  - dropping flip (Gerd Hoffman suggestion)
>  - dropping needless call to console_select (from Gerd)
>  - use a bh for the bug fix itself, previously called dpy_update
>   and wrote to vga->ds.surface->data from spice server thread, a no no.
>  - last patch uses a bh for the ppm_save as well, same problem as one
>   in the previous round. I'm going to work on a solution to that as discussed
>   on the list (either a QAPI equivalent of the old async monitor or a new 
> really
>   async command with completion event that libvirt/autotest/etc would have to
>   use), but didn't want to wait for that with the already prolonged wait from 
> the last
>   RFC.
> 
> Please review,
> 
> Alon Levy (8):
>   sdl: remove NULL check, g_malloc0 can't fail
>   qxl: drop qxl_spice_update_area_async definition
>   qxl: screen_dump in vga: do a single ppm_save
>   qxl: require spice >= 0.8.2
>   qxl: remove flipped
>   qxl: introduce QXLCookie
>   qxl: make qxl_render_update async
>   qxl-render: call ppm_save on bh
> 
> Gerd Hoffman (1):
>   console: don't call console_select unnecessarily
> 
>  configure          |    2 +-
>  console.c          |    6 +-
>  hw/qxl-render.c    |  228 
> ++++++++++++++++++++++++++++++++++++++--------------
>  hw/qxl.c           |  189 ++++++++++++++++++++++++++++++-------------
>  hw/qxl.h           |   28 ++++---
>  ui/sdl.c           |    4 -
>  ui/spice-display.c |   34 +++++----
>  ui/spice-display.h |   22 +++++
>  8 files changed, 359 insertions(+), 154 deletions(-)
> 
> -- 
> 1.7.9.1
> 
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