linux-kernel - Re: [PATCH] sched/cputime: Make IRQ time accounting configurable at boot time

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Message-ID: <20230616074518.GW4253@hirez.programming.kicks-ass.net>
Date:   Fri, 16 Jun 2023 09:45:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     linux-kernel@...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>
Subject: Re: [PATCH] sched/cputime: Make IRQ time accounting configurable at
 boot time

On Thu, Jun 15, 2023 at 01:37:26PM -0700, Bart Van Assche wrote:
> Some producers of Android devices want IRQ time accounting enabled while
> others want IRQ time accounting disabled. Hence, make IRQ time accounting
> configurable at boot time.

Why would they want this disabled? IRQ time accounting avoids a number
of issues under high irq/softirq pressure.

Disabling this makes no sense.