linux-kernel - Re: [PATCH] sched/fair: properly serialize the cfs_rq h

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Message-ID: <20241122154253.GZ24774@noisy.programming.kicks-ass.net>
Date: Fri, 22 Nov 2024 16:42:53 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Daniel Vacek <neelx@...e.com>
Cc: 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>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: properly serialize the cfs_rq h_load
 calculation

On Fri, Nov 22, 2024 at 04:28:55PM +0100, Daniel Vacek wrote:
> Make sure the given cfs_rq's h_load is always correctly updated. This
> prevents a race between more CPUs eventually updating the same hierarchy
> of h_load_next return pointers.

Is there an actual problem observed?