linux-kernel - Re: [PATCH] sched/topology: Switch to sched_debug() for conditional sched domain printk

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Message-ID: <20210203095256.vzduw2gpcpum6a7g@linux.vnet.ibm.com>
Date:   Wed, 3 Feb 2021 15:22:56 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Yue Hu <zbestahu@...il.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org,
        huyue2@...ong.com, zbestahu@....com, srikar@...ux.vnet.ibm.com
Subject: Re: [PATCH] sched/topology: Switch to sched_debug() for conditional
 sched domain printk

* Yue Hu <zbestahu@...il.com> [2021-02-03 12:20:10]:

> From: Yue Hu <huyue2@...ong.com>
> 
> Currently, the macro sched_debug_enabled has same function as
> sched_debug() with return false for !SCHED_DEBUG. And sched_debug()
> is a wapper of variable sched_debug_enabled for SCHED_DEBUG. We
> can use the sched_debug() for all cases. So, let's remove the
> unnecessary marco, also use sched_debug() in sched_domain_debug()
> for code consistency.
> 
> Signed-off-by: Yue Hu <huyue2@...ong.com>
> ---
>  kernel/sched/topology.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> index 5d3675c..402138c 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -131,7 +131,7 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
>  {
>  	int level = 0;
>  
> -	if (!sched_debug_enabled)
> +	if (!sched_debug())
>  		return;
>  

sched_debug() would only be present in CONFIG_SCHED_DEBUG. Right?
In which case there would be a build failure with your change in
!CONFIG_SCHED_DEBUG config.

or Am I missing something?

>  	if (!sd) {
> @@ -152,7 +152,6 @@ static void sched_domain_debug(struct sched_domain *sd, int cpu)
>  }
>  #else /* !CONFIG_SCHED_DEBUG */
>  
> -# define sched_debug_enabled 0
>  # define sched_domain_debug(sd, cpu) do { } while (0)
>  static inline bool sched_debug(void)
>  {
> @@ -2113,7 +2112,7 @@ static bool topology_span_sane(struct sched_domain_topology_level *tl,
>  	if (has_asym)
>  		static_branch_inc_cpuslocked(&sched_asym_cpucapacity);
>  
> -	if (rq && sched_debug_enabled) {
> +	if (rq && sched_debug()) {

Same as above.

>  		pr_info("root domain span: %*pbl (max cpu_capacity = %lu)\n",
>  			cpumask_pr_args(cpu_map), rq->rd->max_cpu_capacity);
>  	}
> -- 
> 1.9.1
> 

-- 
Thanks and Regards
Srikar Dronamraju