PERF_CPUM_SF_FREQ_MODE   74 arch/s390/include/asm/perf_event.h #define SAMPLE_FREQ_MODE(hwc)	(SAMPL_FLAGS(hwc) & PERF_CPUM_SF_FREQ_MODE)
PERF_CPUM_SF_FREQ_MODE  750 arch/s390/kernel/perf_cpum_sf.c 		SAMPL_FLAGS(hwc) |= PERF_CPUM_SF_FREQ_MODE;