linux-kernel - Re: [PATCH 1/3] sched_ext: Minor cleanups in kernel/sched/ext.h

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Date: Sun, 23 Jun 2024 02:16:21 -0500
From: David Vernet <void@...ifault.com>
To: Tejun Heo <tj@...nel.org>
Cc: torvalds@...ux-foundation.org, mingo@...hat.com, peterz@...radead.org,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH 1/3] sched_ext: Minor cleanups in kernel/sched/ext.h

On Sat, Jun 22, 2024 at 03:50:20PM -1000, Tejun Heo wrote:
> - scx_ops_cpu_preempt is only used in kernel/sched/ext.c and doesn't need to
>   be global. Make it static.
> 
> - Relocate task_on_scx() so that the inline functions are located together.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: David Vernet <void@...ifault.com>

Acked-by: David Vernet <void@...ifault.com>

> ---
>  kernel/sched/ext.c |  2 +-
>  kernel/sched/ext.h | 12 +++++-------
>  2 files changed, 6 insertions(+), 8 deletions(-)
> 
> diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c
> index 28f7a4266fde..d4c645f9e031 100644
> --- a/kernel/sched/ext.c
> +++ b/kernel/sched/ext.c
> @@ -771,7 +771,7 @@ static bool scx_warned_zero_slice;
>  
>  static DEFINE_STATIC_KEY_FALSE(scx_ops_enq_last);
>  static DEFINE_STATIC_KEY_FALSE(scx_ops_enq_exiting);
> -DEFINE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
> +static DEFINE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
>  static DEFINE_STATIC_KEY_FALSE(scx_builtin_idle_enabled);
>  
>  struct static_key_false scx_has_op[SCX_OPI_END] =
> diff --git a/kernel/sched/ext.h b/kernel/sched/ext.h
> index 0a7b9a34b18f..229007693504 100644
> --- a/kernel/sched/ext.h
> +++ b/kernel/sched/ext.h
> @@ -26,13 +26,6 @@ DECLARE_STATIC_KEY_FALSE(__scx_switched_all);
>  #define scx_enabled()		static_branch_unlikely(&__scx_ops_enabled)
>  #define scx_switched_all()	static_branch_unlikely(&__scx_switched_all)
>  
> -DECLARE_STATIC_KEY_FALSE(scx_ops_cpu_preempt);
> -
> -static inline bool task_on_scx(const struct task_struct *p)
> -{
> -	return scx_enabled() && p->sched_class == &ext_sched_class;
> -}
> -
>  void scx_tick(struct rq *rq);
>  void init_scx_entity(struct sched_ext_entity *scx);
>  void scx_pre_fork(struct task_struct *p);
> @@ -54,6 +47,11 @@ static inline u32 scx_cpuperf_target(s32 cpu)
>  		return 0;
>  }
>  
> +static inline bool task_on_scx(const struct task_struct *p)
> +{
> +	return scx_enabled() && p->sched_class == &ext_sched_class;
> +}
> +
>  static inline const struct sched_class *next_active_class(const struct sched_class *class)
>  {
>  	class++;
> -- 
> 2.45.2
> 

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