> Claudio Fontana <address@hidden> writes: > > Shehbaz Jaffer wrote: > > > >> I want to determine the amount of screen activity taking place on VGA > >> monitor/ Screen for different applications (eg. playing vlc video, normal > >> typing.) > >> > >> When I do not start the X server, I can easily determine the screen > >> activity > >> by counting the number of pages accessed in the region 0xA0000 - 0xBffff > >> (This is the VGA Monitor region in boot screen). > >> > >> However when I start the X Server, A diffrent set of pages are hit. Could > >> anyone please explain how the VGA Monitor works in QEMU? Or if someone > >> could > >> suggest an alternate solution to determine amount of screen activity while > >> playing diffrent applications? > >> > >> [NOTE : I have already checked for the region where X server pages are > >> mapped using cat /proc/iomem. But pages are not getting written to the > >> "possible" X server mmapped region.] > >> > >> Regards, > > > > If you define "screen activity" = "number of pages accessed in the > > range 0xa0000-0xbffff per unit of time", you could keep your thing > > going by just using the generic "vga" driver in your Xorg > > configuration, and that would keep your model valid I think. > > Pretty sure the vga driver will use VESA interfaces and the VESA BIOS > will use PCI bar mapping.
you are thinking of the generic 'vesa' driver: http://cgit.freedesktop.org/xorg/driver/xf86-video-vesa/ There is also a generic 'vga' driver: http://cgit.freedesktop.org/xorg/driver/xf86-video-vga/ That said, I was being semi-serious: an Xorg running on plain vga driver is hardly a realistic use-case. > You could also trap accesses to where the BAR gets mapped on the PCI > device. Far better to just register a DisplayChangeListener though and > let QEMU do the heavy lifting. > > Or use VNC as Richard mentioned elsewhere. > > Regards, > > Anthony Liguori > > > > > Claudio
