Re: [PATCH 2/2] sched/fair: util_est: add running_sum tracking

[kbuild test robot]

Hi Patrick,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/sched/core]
[also build test ERROR on next-20180604]
[cannot apply to v4.17]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Patrick-Bellasi/sched-fair-pelt-use-u32-for-util_avg/20180605-082640
config: i386-randconfig-a1-06041847 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/sched/fair.c: In function 'enqueue_task_fair':
>> kernel/sched/fair.c:5450:2: error: implicit declaration of function 'util_est_enqueue_running' [-Werror=implicit-function-declaration]
     util_est_enqueue_running(p);
     ^
   cc1: some warnings being treated as errors

vim +/util_est_enqueue_running +5450 kernel/sched/fair.c

  5389	
  5390	/*
  5391	 * The enqueue_task method is called before nr_running is
  5392	 * increased. Here we update the fair scheduling stats and
  5393	 * then put the task into the rbtree:
  5394	 */
  5395	static void
  5396	enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
  5397	{
  5398		struct cfs_rq *cfs_rq;
  5399		struct sched_entity *se = &p->se;
  5400	
  5401		/*
  5402		 * The code below (indirectly) updates schedutil which looks at
  5403		 * the cfs_rq utilization to select a frequency.
  5404		 * Let's add the task's estimated utilization to the cfs_rq's
  5405		 * estimated utilization, before we update schedutil.
  5406		 */
  5407		util_est_enqueue(&rq->cfs, p);
  5408	
  5409		/*
  5410		 * If in_iowait is set, the code below may not trigger any cpufreq
  5411		 * utilization updates, so do it here explicitly with the IOWAIT flag
  5412		 * passed.
  5413		 */
  5414		if (p->in_iowait)
  5415			cpufreq_update_util(rq, SCHED_CPUFREQ_IOWAIT);
  5416	
  5417		for_each_sched_entity(se) {
  5418			if (se->on_rq)
  5419				break;
  5420			cfs_rq = cfs_rq_of(se);
  5421			enqueue_entity(cfs_rq, se, flags);
  5422	
  5423			/*
  5424			 * end evaluation on encountering a throttled cfs_rq
  5425			 *
  5426			 * note: in the case of encountering a throttled cfs_rq we will
  5427			 * post the final h_nr_running increment below.
  5428			 */
  5429			if (cfs_rq_throttled(cfs_rq))
  5430				break;
  5431			cfs_rq->h_nr_running++;
  5432	
  5433			flags = ENQUEUE_WAKEUP;
  5434		}
  5435	
  5436		for_each_sched_entity(se) {
  5437			cfs_rq = cfs_rq_of(se);
  5438			cfs_rq->h_nr_running++;
  5439	
  5440			if (cfs_rq_throttled(cfs_rq))
  5441				break;
  5442	
  5443			update_load_avg(cfs_rq, se, UPDATE_TG);
  5444			update_cfs_group(se);
  5445		}
  5446	
  5447		if (!se)
  5448			add_nr_running(rq, 1);
  5449	
> 5450		util_est_enqueue_running(p);
  5451	
  5452		hrtick_update(rq);
  5453	}
  5454	

---
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