Hi YanQing,
+ LAKML + Mark + Will
Am 04.12.19 um 05:55 schrieb Wang YanQing:
> I use "perf record" to debug performance issue on RTD1296 SOC, it does't work, but
> the "perf stat" is ok!
Thanks for the report - which board, branch and (base) tag are you
testing against? And are you building perf yourself from kernel sources,
or are you using some distro package?
I only have Busybox in my initrd on DS418; I have not tested perf.
> After some dig in the kernel, I find the reason is no pmu overflow interrupt, I think
> below pmu configuration isn't right for RTD1296:
> "
> arm_pmu: arm-pmu {
> compatible = "arm,cortex-a53-pmu";
> interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
> };
> "
>
> We need 4 PMU SPI for RTD1296 (4 cores), and I guess the 48 isn't right too.
Note that above rtd129x.dtsi snippet is not complete. See rtd1296.dtsi:
&arm_pmu {
interrupt-affinity = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>;
};
48 and high/4 match what I see in the latest BSP:
https://github.com/BPI-SINOVOIP/BPI-M4-bsp/blob/master/linux-rtk/arch/arm64/boot/dts/realtek/rtd129x/rtd-1296.dtsi#L116
> Any suggestion is welcome.
>
> Thanks!
The only difference I see is "arm,cortex-a53-pmu" vs. "arm,armv8-pmuv3".
By my reading of arch/arm64/kernel/perf_event.c the only difference
between the two should be the name and an extra cache_map. You could try
the other compatible string in your .dts, but I doubt it'll help.
Hopefully the Realtek or Arm guys can shed some light.
Regards,
Andreas
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