ARMV7 PMU event counter always return 0

I am want to use arm pmu to profile checksum algorithm performance, but the event counter always return 0, only cycle counter is normal. The step i use as follows: 1. enable user enable by setting...
ARM v8 PMU Cycle counter

All, When I am using the cycle counter in AArch64, I am not getting cycles properly. I have enabled read of pmccntr_el0 in user space using a small kernel module. I have sample code like: asm volatile...
ARM v8 PMU Cycle counter

All, When I am using the cycle counter in AArch64, I am not getting cycles properly. I have enabled read of pmccntr_el0 in user space using a small kernel module. I have sample code like: asm volatile...
PMU's cycles counter showing unstable values

I'm trying to measure performance of my code by using pmu. Code placed in EL1. To test pmu I created simple loop of couple operations. I did it under spinlock with disabled interrupts to prevent any preemption...
PMU's cycles counter showing unstable values

I'm trying to measure performance of my code by using pmu. Code placed in EL1. To test pmu I created simple loop of couple operations. I did it under spinlock with disabled interrupts to prevent any preemption...