DEFAULT_MAX_SAMPLE_RATE  416 kernel/events/core.c #define DEFAULT_SAMPLE_PERIOD_NS	(NSEC_PER_SEC / DEFAULT_MAX_SAMPLE_RATE)
DEFAULT_MAX_SAMPLE_RATE  419 kernel/events/core.c int sysctl_perf_event_sample_rate __read_mostly	= DEFAULT_MAX_SAMPLE_RATE;
DEFAULT_MAX_SAMPLE_RATE  421 kernel/events/core.c static int max_samples_per_tick __read_mostly	= DIV_ROUND_UP(DEFAULT_MAX_SAMPLE_RATE, HZ);