linux-kernel - Re: [PATCH v2] sched/clock: Avoid false sharing for sched_clock

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Message-ID: <20260113100755.GV830755@noisy.programming.kicks-ass.net>
Date: Tue, 13 Jan 2026 11:07:55 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Wangyang Guo <wangyang.guo@...el.com>
Cc: K Prateek Nayak <kprateek.nayak@....com>,
	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,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Benjamin Lei <benjamin.lei@...el.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Tianyou Li <tianyou.li@...el.com>
Subject: Re: [PATCH v2] sched/clock: Avoid false sharing for
 sched_clock_irqtime

On Tue, Jan 13, 2026 at 03:48:07PM +0800, Wangyang Guo wrote:
> Read-mostly sched_clock_irqtime may share the same cacheline with
> frequently updated nohz struct. Mark it as __read_mostly to avoid
> false sharing issue.
> 

Is there a reason that thing can't be a static_key or so?