struct hrtimer_clock_base — the timer base for a specific clock
struct hrtimer_clock_base {
struct hrtimer_cpu_base * cpu_base;
int index;
clockid_t clockid;
struct timerqueue_head active;
ktime_t resolution;
ktime_t (* get_time) (void);
ktime_t softirq_time;
ktime_t offset;
}; per cpu clock base
clock type index for per_cpu support when moving a timer to a base on another cpu.
clock id for per_cpu support
red black tree root node for the active timers
the resolution of the clock, in nanoseconds
function to retrieve the current time of the clock
the time when running the hrtimer queue in the softirq
offset of this clock to the monotonic base