On Tue, 2004-10-05 at 15:15 -0400, Owen Taylor wrote: > Well, the biggest problem with backing store is that it is per-window > not per *toplevel* window. In X, toplevel windows can have subwindows Hmm, interesting. It seems, though, that the X11 forefathers have thought of that, to a degree. There used to be (still are?) the "WhenMapped" and "WhenUseful" backing store attributes. There still seems to be the -wm server switch, turning on "WhenMapped" for all windows. > In certain circumstances, X can end up storing huge amounts of entirely > useless pixel data for subwindows because it mistakes them for > obscured toplevels. How much of an issue is this? I vaguely remember reading once that backing store uses off-screen frame buffer memory (there should be plenty of that on a 128MB graphics card running at 1280x1024). Does backing store actually affect the X server memory footprint? Then again, doesn't the reported memory footprint of the X server contain all the mapped in frame buffer memory as well? The more I think about it the more I realise my utter ignorance in all of this... Cheers Steffen.
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