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Message-ID: <20151005105209.GG2903@worktop.programming.kicks-ass.net> Date: Mon, 5 Oct 2015 12:52:09 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Yuyang Du <yuyang.du@...el.com> Cc: mingo@...nel.org, linux-kernel@...r.kernel.org, pjt@...gle.com, bsegall@...gle.com, morten.rasmussen@....com, vincent.guittot@...aro.org, dietmar.eggemann@....com Subject: Re: [PATCH 1/4] sched/fair: Generalize the load/util averages resolution definition 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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