On Mon, Oct 05, 2015 at 01:56:56AM +0800, Yuyang Du wrote: > Metric needs certain resolution to allow detail we can look into, > which also determines the range of the metric. > > For instance, increasing the resolution of [0, 1] (two levels), one > can multiply 1024 and get [0..1024] (1025 levels). >
> /* > + * Integer metrics need certain resolution to allow how much detail we > + * can look into, e.g., load, load_avg, util_avg, freq, and capacity. > + * We define a basic resolution constant number, and then formalize > + * all these metrics based on that basic resolution. > + */ > +# define SCHED_RESOLUTION_SHIFT 10 > +# define SCHED_RESOLUTION_SCALE (1L << SCHED_RESOLUTION_SHIFT) > + > +/* I find all that most confusing, maybe just refer to fixed point arithmetic, that's a well defined and well understood concept. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
