IRC log of #maemo-devel for Thursday, 2010-05-27

« Wednesday, 2010-05-26 Index Friday, 2010-05-28 »
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scooprsince pr1.2, in my app exit_app_view (task switcher) started going directly in to dashboard, instead of the task switcher. I found the culprit to be that my window is in portrait mode. If I unset portrait property before taskswitching, and then reset it on EnterNotify, it works as a workaround11:52
scooprbut if I do ctrl-backspace for taskswitcher, then it again goes to dashboard, because I won't know to unset the portrait mode property11:53
scooprthis used to work in pr1.1, so I would call this a regression11:53
scoopris there something magical that needs to change or should I just file a bug?11:53
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StippenG Hello! Is there a good way of counting cpu cycles between two points in a program on fremantle? I suppose it's possible using inline assembly at least, but are there some C functions for this too?15:05
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SpeedEvilyes15:10
SpeedEvilactually - what do you mean by cycles15:10
SpeedEvildo you mean one or two, or a few million?15:10
SpeedEvil /proc/nnn/stat may be useful for the latter15:11
StippenGI would like to time some opengl commands mostly, and I figure reading some cpu cycle count would be a good way. It doesn't have to be super accurate, but shouldn't have a high overhead either. I'll look at /proc/nnn/stat and see if that might be enough, but some function that just reads a clock value directly seems like a better idea if that exists15:14
Wolfiei'm assuming, you want to count the cpu clocks for your current process?15:15
Wolfieand not the whole system... multitasking might skew that number a bit ;)15:15
StippenGIf that is possible yes, otherwise I figure I will have to run the function multiple times and get an average time to account for other processes running in between15:17
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StippenGI'm a bit worried that multitasking could skew the results a bit yes :) since there are quite a few processes running on the N90015:17
StippenGShould still give me a nice idea of memory transfer times to the GPU for example I figure15:18
SpeedEvilgettimeofday before and after?15:20
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SpeedEvil /proc/timer_list has the time at the top. There is certainly a better way to call this thoushg. Wander around in the kernel docs15:24
StippenGAh, that would be a good backup plan if nothing better comes around. It seems to have microsecond precision at least ;) I just heard that for some systems you can quite easily recover a clock count since power on.15:24
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zokierclock_gettime can have up to nanosecond precision iirc15:27
StippenGAh, thanks! clock_gettime with CLOCK_PROCESS_CPUTIME_ID ("High-resolution per-process timer from the CPU.") seems like it would be worth trying15:30
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StippenGTrying to do some video decoding on the N900 GPU, and need to find out the cost of uploading textures and coordinates to GPU memory and such to decide if it's worth it :)15:33
zokierim not sure if cpu time is what you want if you want to account for time used by the gpu15:35
StippenGhmm, I guess it depends. If the cpu is blocked during a texture upload to the GPU, the CPU time will tell me how much time the upload took pretty much, right? If the CPU is not blocked, but only sets up some DMA transfer, I suppose I will have to use system time15:44
StippenGand figure out wether the transfer is actually completed when the function returns15:45
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SpeedEvilhas anyone else see anything touching /home deadlock?16:14
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