linux-kernel - Re: [RFC PATCH v3 10/10] sched/fair: Throttle CFS tasks on return to userspace

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Message-ID: <20240712171046.GV27299@noisy.programming.kicks-ass.net>
Date: Fri, 12 Jul 2024 19:10:46 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Valentin Schneider <vschneid@...hat.com>
Cc: linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Phil Auld <pauld@...hat.com>, Clark Williams <williams@...hat.com>,
	Tomas Glozar <tglozar@...hat.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
	Joel Fernandes <joel@...lfernandes.org>,
	Josh Triplett <josh@...htriplett.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>, Guo Ren <guoren@...nel.org>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>, Jens Axboe <axboe@...nel.dk>
Subject: Re: [RFC PATCH v3 10/10] sched/fair: Throttle CFS tasks on return to
 userspace

On Thu, Jul 11, 2024 at 03:00:04PM +0200, Valentin Schneider wrote:
> +static void task_throttle_cancel_irq_work_fn(struct irq_work *work)
> +{
> +	struct task_struct *p = container_of(work, struct task_struct, unthrottle_irq_work);
> +	int cpu = raw_smp_processor_id();
> +
> +	CLASS(task_rq_lock, rq_guard)(p);

	guard(task_rq_lock)(p);

> +	WARN_ON_ONCE(task_cpu(p) != cpu);
> +
> +	if (task_has_throttle_work(p) && !task_needs_throttling(p))
> +		task_throttle_do_cancel_work(p);
> +}