linux-kernel - Re: [PATCH v2 5/7] sched: Implement shared runqueue in CFS

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Message-ID: <20230713082954.GE3139243@hirez.programming.kicks-ass.net>
Date:   Thu, 13 Jul 2023 10:29:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Vernet <void@...ifault.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        gautham.shenoy@....com, kprateek.nayak@....com, aaron.lu@...el.com,
        clm@...a.com, tj@...nel.org, roman.gushchin@...ux.dev,
        kernel-team@...a.com
Subject: Re: [PATCH v2 5/7] sched: Implement shared runqueue in CFS

On Mon, Jul 10, 2023 at 03:03:40PM -0500, David Vernet wrote:
> +struct shared_runq {
> +	struct list_head list;
> +	spinlock_t lock;

FWIW, this really needs to be raw_spinlock_t.

> +} ____cacheline_aligned;