You should be able to call seL4 syscalls from a CAmkES component. Just include the right headers (and link the library if necesary).
Note that if the syscalls require caps, then you are on your own wrt how to get the caps. Ihor > On 18 Jan 2017, at 12:29 pm, Andrew Gacek <[email protected]> wrote: > > Thanks Adrian. This is a useful start. It sounds like the easiest > thing may be to overwrite some syscall that I don't use to loop over > all the threads in the kernel and print out their debugging info. > > Also, I've never called raw seL4 system calls from a camkes component > before. Is it just a matter of calling seL4_BenchmarkResetLog() or > seL4_BenchmarkFinalizeLog() directly in the control code for one of my > components? > > -Andrew > > On Tue, Jan 17, 2017 at 7:23 PM, <[email protected]> wrote: >> Hi Andrew, >> >> There is some code already in the kernel to help you do this, although it is >> tested and fixed on an as used basis so may or may not work as I describe. >> You can enable the the thread utilization tracking with >> make menuconfig -> seL4 Kernel -> Build Options -> Enable benchmarks -> >> Track threads and kernel utilisation time >> Once enabled you gain the following relevant functions >> >> seL4_BenchmarkResetLog() >> Reset idle time and total run time and start capturing utilization >> information >> >> seL4_BenchmarkFinalizeLog() >> Calculate idle time, total run time and stop capturing utilization >> information >> >> seL4_BenchmarkGetThreadUtilisation(seL4_Word tcb_cptr) >> Retrieve the utilization for a particular thread where >> seL4_GetMR(0) == Thread utilization (in cycles) of this (tcb_cptr) thread >> seL4_GetMR(1) == Idle thread utilization (in cycles) between the last call >> to Reset and Finalize log >> seL4_GetMR(2) == Totall execution time (in cycles) between the last call to >> Reset and Finalize log >> >> seL4_BenchmarkResetThreadUtilisation(seL4_Word tcb_cptr) >> Reset the utilization of this thread. >> >> The main problem with this API is that it requires you to have caps to all >> the threads you wish to get the information of, which in CAmkES is generally >> only the capdl-loader application. It is also designed with the idea that >> you want to reset the utilization counts at the point you're querying them, >> i.e. you're doing some kind of benchmark and you just want utilization over >> that benchmark. >> >> Hope this provides some use to you. >> >> Adrian >> >> >> On Wed 18-Jan-2017 9:59 AM, Andrew Gacek wrote: >> >> Hi, >> >> I'm interested in seeing how much of the CPU is being used by the >> various threads in my (camkes) application. I'd like a simple "Task >> Manager" style report of the form: >> >> 70% idle >> 25% can_obj_7_0_control_9_tcb >> 5% can_obj_7_Int_3_0000_tcb >> 0% can_obj_7_0_fault_handler_15_ >> 0000_tcb >> etc >> >> I've tried poking around libsel4bench, but I don't see any obvious way >> of benchmarking the whole system. From what I can tell, it's mostly >> designed to get cycle counts from specific code segments. Is that >> right? What's the best way to go about benchmarking the whole system? >> It's only for debugging, so I'm willing to make some quick-and-dirty >> changes to the kernel just to see the results. >> >> Thanks, >> Andrew >> >> _______________________________________________ >> Devel mailing list >> [email protected] >> https://sel4.systems/lists/listinfo/devel >> >> > > _______________________________________________ > Devel mailing list > [email protected] > https://sel4.systems/lists/listinfo/devel _______________________________________________ Devel mailing list [email protected] https://sel4.systems/lists/listinfo/devel
