linux-kernel - Re: [PATCH] sched/isolation: delete redundant housekeeping

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Message-ID: <20211123123852.11a84a9e@gandalf.local.home>
Date:   Tue, 23 Nov 2021 12:38:52 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Aili Yao <yaoaili126@...il.com>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, linux-kernel@...r.kernel.org,
        yaoaili@...gsoft.com
Subject: Re: [PATCH] sched/isolation: delete redundant
 housekeeping_overridden check

On Tue, 23 Nov 2021 15:45:35 +0800
Aili Yao <yaoaili126@...il.com> wrote:

> From: Aili Yao <yaoaili@...gsoft.com>
> 
> housekeeping_test_cpu is only called by housekeeping_cpu(),
> and in housekeeping_cpu(), there is already one same check;
> 
> So delete the redundant check.
> 
> Signed-off-by: Aili Yao <yaoaili@...gsoft.com>
> ---
>  kernel/sched/isolation.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
> index 7f06eaf..5c4d533 100644
> --- a/kernel/sched/isolation.c
> +++ b/kernel/sched/isolation.c
> @@ -56,9 +56,8 @@ void housekeeping_affine(struct task_struct *t, enum
> hk_flags flags) 
>  bool housekeeping_test_cpu(int cpu, enum hk_flags flags)
>  {
> -	if (static_branch_unlikely(&housekeeping_overridden))
> -		if (housekeeping_flags & flags)
> -			return cpumask_test_cpu(cpu,
> housekeeping_mask);

Not only is your email client broken, you don't seem to understand what
static_branch_unlikely() is.

NACK.

-- Steve


> +	if (housekeeping_flags & flags)
> +		return cpumask_test_cpu(cpu, housekeeping_mask);
>  	return true;
>  }
>  EXPORT_SYMBOL_GPL(housekeeping_test_cpu);