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From: Peter Zijlstra <peterz@infradead.org>
To: Yafang Shao <laoar.shao@gmail.com>
Cc: mingo@redhat.com, mgorman@suse.de, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
	rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com,
	achaiken@aurora.tech, lkp@intel.com,
	linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: [PATCH v3 2/7] sched: make struct sched_statistics independent of fair sched class
Date: Tue, 31 Aug 2021 12:19:50 +0200	[thread overview]
Message-ID: <YS4CRi7nzfGk2o7u@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20210824112946.9324-3-laoar.shao@gmail.com>

On Tue, Aug 24, 2021 at 11:29:41AM +0000, Yafang Shao wrote:

> +#ifdef CONFIG_FAIR_GROUP_SCHED
> +static inline void
> +__schedstats_from_sched_entity(struct sched_entity *se,
> +			      struct sched_statistics **stats)
> +{
> +	struct task_group *tg;
> +	struct task_struct *p;
> +	struct cfs_rq *cfs;
> +	int cpu;
> +
> +	if (entity_is_task(se)) {
> +		p = task_of(se);
> +		*stats = &p->stats;
> +	} else {
> +		cfs = group_cfs_rq(se);
> +		tg = cfs->tg;
> +		cpu = cpu_of(rq_of(cfs));
> +		*stats = tg->stats[cpu];
> +	}
> +}
> +
> +#else
> +
> +static inline void
> +__schedstats_from_sched_entity(struct sched_entity *se,
> +			      struct sched_statistics **stats)
> +{
> +	struct task_struct *p;
> +
> +	p = task_of(se);
> +	*stats = &p->stats;
> +}
> +
> +#endif
> +
>  /*
>   * Update the current task's runtime statistics.
>   */
> @@ -826,6 +861,7 @@ static void update_curr(struct cfs_rq *cfs_rq)
>  {
>  	struct sched_entity *curr = cfs_rq->curr;
>  	u64 now = rq_clock_task(rq_of(cfs_rq));
> +	struct sched_statistics *stats = NULL;
>  	u64 delta_exec;
>  
>  	if (unlikely(!curr))
> @@ -837,8 +873,11 @@ static void update_curr(struct cfs_rq *cfs_rq)
>  
>  	curr->exec_start = now;
>  
> -	schedstat_set(curr->statistics.exec_max,
> -		      max(delta_exec, curr->statistics.exec_max));
> +	if (schedstat_enabled()) {
> +		__schedstats_from_sched_entity(curr, &stats);
> +		__schedstat_set(stats->exec_max,
> +				max(delta_exec, stats->exec_max));
> +	}
>  
>  	curr->sum_exec_runtime += delta_exec;
>  	schedstat_add(cfs_rq->exec_clock, delta_exec);


That's just really odd style; what's wrong with something like:

static inline struct sched_statistics *
__schedstats_from_se(struct sched_entity *se)
{
	...
}

	if (schedstats_enabled()) {
		struct sched_statistics *stats = __schedstats_from_se(curr);
		__schedstat_set(stats->exec_max, max(stats->exec_max, delta_exec));
	}



  parent reply	other threads:[~2021-08-31 10:20 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 11:29 [PATCH v3 0/7] sched: support schedstats for RT " Yafang Shao
2021-08-24 11:29 ` [PATCH v3 1/7] sched, fair: use __schedstat_set() in set_next_entity() Yafang Shao
2021-08-24 11:29 ` [PATCH v3 2/7] sched: make struct sched_statistics independent of fair sched class Yafang Shao
2021-08-31 10:14   ` Peter Zijlstra
2021-08-31 13:25     ` Yafang Shao
2021-08-31 10:19   ` Peter Zijlstra [this message]
2021-08-31 13:25     ` Yafang Shao
2021-08-24 11:29 ` [PATCH v3 3/7] sched: make schedstats helpers " Yafang Shao
2021-08-31 11:07   ` Peter Zijlstra
2021-08-31 13:27     ` Yafang Shao
2021-08-24 11:29 ` [PATCH v3 4/7] sched: make the output of schedstats " Yafang Shao
2021-08-31 11:08   ` Peter Zijlstra
2021-08-31 13:27     ` Yafang Shao
2021-08-24 11:29 ` [PATCH v3 5/7] sched: introduce task block time in schedstats Yafang Shao
2021-08-24 11:29 ` [PATCH v3 6/7] sched, rt: support sched_stat_runtime tracepoint for RT sched class Yafang Shao
2021-08-24 11:29 ` [PATCH v3 7/7] sched, rt: support schedstats " Yafang Shao
2021-08-31 10:08 ` [PATCH v3 0/7] sched: " Peter Zijlstra
2021-08-31 10:44   ` Peter Zijlstra
2021-08-31 13:21     ` Yafang Shao
2021-08-31 12:57   ` Yafang Shao

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