On Fri, Apr 19, 2013 at 2:27 PM, Jiří Zárevúcky <[email protected]> wrote: > On 19 April 2013 13:04, Jiří Zárevúcky <[email protected]> wrote: >>>> >>>> PS: The reason I want to disable compositor is because it still locks >>>> up for me (qemu i386 with or without kvm, updated Arch Linux). >>>> >>>> -- Jirka Z. >>> >>> Does it lock up on any input or just mouse input? Is it possible to >>> move windows with Alt+WSAD? If it is mouse exclusive, does it lock up >>> on mouse click, mouse move or mouse move with pressed button? Does it >>> happen even on the desktop background or just when you try to interact >>> with an active element? >>> >>> Petr >>> >> >> I can use keyboard, as long as I don't move the mouse. When I move the >> cursor just a tiny bit (no matter where), all inputs freeze. I am >> trying to find the cause now. Any hints on where to focus? >> > > So, I've learned that the problem is apparently in the i8042 driver itself. > The interrupt handler is not guaranteed to finish, ever. Nor is there > a bound on concurrently spawned handlers. With continuous mouse > movement, driver is flooded with requests, handlers are spawned but > never finished. Eventually, after a while, i8042 task crashes from > memory exhaustion.
If this is the case than you have uncovered a symptom not the real cause. The i8042 buffer size is limited to 12 bytes, that means 3 or 4 ps2 messages. It expects someone (xtkbd or ps2mouse) to read the data. so the real question is why they don't do this. Don't get me wrong, I agree that i8042 could be more robust, but that would only change crash to series of "data dropped" messages. Moreover, you need to be careful about dropping data, if you drop single bytes you break ps2 protocol, and the result is unusable mouse (or keyboard). That's why the buffer blocks. Jan > > -- Jirka Z. > > _______________________________________________ > HelenOS-devel mailing list > [email protected] > http://lists.modry.cz/cgi-bin/listinfo/helenos-devel _______________________________________________ HelenOS-devel mailing list [email protected] http://lists.modry.cz/cgi-bin/listinfo/helenos-devel
