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commit 4ee6c62c9d14ba0cd2086333b8f8e4cdd18471f8 Author: Marco Casaroli <[email protected]> AuthorDate: Tue Nov 3 17:32:09 2026 +0100 arch/arm64/qemu: Give up_perf_init() the 1 GHz rate of the QEMU PMU. QEMU counts the PMU cycle counter (PMCCNTR_EL0) at a fixed 1 GHz, with TCG and with HVF. qemu_boot.h gives up_perf_init() 62.5 MHz, so perf_convert() and the CPU-time clocks of SCHED_CRITMONITOR run 16 times too fast: a busy loop of 200 ms gives 3200 ms of CPU time. Set CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC to 1 GHz. In arch/arm64/src/qemu only up_perf_init() uses it. Assisted-by: Claude Code:claude-opus-5-5 Signed-off-by: Marco Casaroli <[email protected]> --- arch/arm64/src/qemu/qemu_boot.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/src/qemu/qemu_boot.h b/arch/arm64/src/qemu/qemu_boot.h index 760155e049f..63a235530d2 100644 --- a/arch/arm64/src/qemu/qemu_boot.h +++ b/arch/arm64/src/qemu/qemu_boot.h @@ -38,7 +38,9 @@ * Pre-processor Definitions ****************************************************************************/ -#define CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC 62500000 +/* QEMU counts the PMU cycle counter (PMCCNTR_EL0) at 1 GHz */ + +#define CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC 1000000000 /**************************************************************************** * Public Function Prototypes
