HRTIME_SCALE
ret = (MAX_INCACHE_TIME - elapsed) * HRTIME_SCALE;
secs = (secs + HRTIME_SCALE - 1) / HRTIME_SCALE;
#define GET_SCALED_HRTIME() (int)(gethrtime() / (HRTIME_SCALE * NANOSEC))
#define MAX_INCACHE_TIME (300 / HRTIME_SCALE)