linux-kernel - Re: [PATCH 2/7] sched/fair: prepare throttle path for task based throttle

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250523123516.GK39944@noisy.programming.kicks-ass.net>
Date: Fri, 23 May 2025 14:35:16 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Aaron Lu <ziqianlu@...edance.com>
Cc: Valentin Schneider <vschneid@...hat.com>,
	Ben Segall <bsegall@...gle.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Josh Don <joshdon@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Xi Wang <xii@...gle.com>, linux-kernel@...r.kernel.org,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>, Mel Gorman <mgorman@...e.de>,
	Chengming Zhou <chengming.zhou@...ux.dev>,
	Chuyi Zhou <zhouchuyi@...edance.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Florian Bezdeka <florian.bezdeka@...mens.com>
Subject: Re: [PATCH 2/7] sched/fair: prepare throttle path for task based
 throttle

On Tue, May 20, 2025 at 06:41:05PM +0800, Aaron Lu wrote:
>  static int tg_throttle_down(struct task_group *tg, void *data)
>  {
>  	struct rq *rq = data;
>  	struct cfs_rq *cfs_rq = tg->cfs_rq[cpu_of(rq)];
>  
> +	cfs_rq->throttle_count++;
> +	if (cfs_rq->throttle_count > 1)
> +		return 0;

	if (cfs_rq->throttle_count++)
		return 0;

vs
	
	if (--cfs_rq->throttle_count)
		return;