linux-kernel - Re: [PATCH] sched/psi: bail out early from irq time accounting

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Message-ID: <4f5b8a45-4952-43b0-8818-b78d85fbbf74@bytedance.com>
Date:   Mon, 25 Sep 2023 21:56:57 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     Haifeng Xu <haifeng.xu@...pee.com>, hannes@...xchg.org
Cc:     surenb@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/psi: bail out early from irq time accounting

On 2023/9/25 18:21, Haifeng Xu wrote:
> We could bail out early when psi was disabled.
> 
> Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>
> ---
>  kernel/sched/psi.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
> index 81fca77397f6..e74e14762d49 100644
> --- a/kernel/sched/psi.c
> +++ b/kernel/sched/psi.c
> @@ -1005,6 +1005,9 @@ void psi_account_irqtime(struct task_struct *task, u32 delta)
>  	struct psi_group_cpu *groupc;
>  	u64 now;
>  
> +	if (static_branch_likely(&psi_disabled))
> +		return;
> +
>  	if (!task->pid)
>  		return;
>  

Reviewed-by: Chengming Zhou <zhouchengming@...edance.com>

Thanks.