linux-kernel - Re: [RFC PATCH 3/3] sched/fair: Change @running of __update_load_avg() to @update

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Message-ID: <57506C8B.4050407@arm.com>
Date:	Thu, 2 Jun 2016 18:27:39 +0100
From:	Dietmar Eggemann <dietmar.eggemann@....com>
To:	Juri Lelli <juri.lelli@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Ben Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Yuyang Du <yuyang.du@...el.com>
Subject: Re: [RFC PATCH 3/3] sched/fair: Change @running of
 __update_load_avg() to @update_util

On 02/06/16 10:25, Juri Lelli wrote:

[...]

>> @@ -2757,7 +2754,7 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
>>  						weight * scaled_delta_w;
>>  			}
>>  		}
>> -		if (update_util && running)
>> +		if (update_util == 0x3)
> 
> How about a define for these masks?

Something like this?

+#define UTIL_RUNNING   1
+#define UTIL_UPDATE    2
+
 /*
  * We can represent the historical contribution to runnable average as the
  * coefficients of a geometric series.  To do this we sub-divide our runnable
@@ -2724,7 +2727,7 @@ static u32 __compute_runnable_contrib(u64 n)
  */
 static __always_inline int
 __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
-                 unsigned long weight, int update_util, struct cfs_rq *cfs_rq)
+                 unsigned long weight, int util_flags, struct cfs_rq *cfs_rq)
 {
        u64 delta, scaled_delta, periods;
        u32 contrib;
@@ -2775,7 +2778,7 @@ __update_load_avg(u64 now, int cpu, struct sched_avg *sa,
                                                weight * scaled_delta_w;
                        }
                }
-               if (update_util == 0x3)
+               if (util_flags == (UTIL_UPDATE | UTIL_RUNNING))
                        sa->util_sum += scaled_delta_w * scale_cpu;
...