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

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Message-ID: <20231003112033.GH27267@noisy.programming.kicks-ass.net>
Date:   Tue, 3 Oct 2023 13:20:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Haifeng Xu <haifeng.xu@...pee.com>
Cc:     hannes@...xchg.org, surenb@...gle.com, zhouchengming@...edance.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] sched/psi: bail out early from irq time accounting

On Tue, Sep 26, 2023 at 11:57:22AM +0000, Haifeng Xu wrote:
> We could bail out early when psi was disabled.
> 
> Signed-off-by: Haifeng Xu <haifeng.xu@...pee.com>

Thanks!

> ---
>  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;
>  
> -- 
> 2.25.1
>