linux-kernel - Re: [PATCH v2] sched/core: Skip sched_core_fork/free() when core sched is disabled

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Message-ID: <20220425081410.GA2731@worktop.programming.kicks-ass.net>
Date:   Mon, 25 Apr 2022 10:14:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Cruz Zhao <CruzZhao@...ux.alibaba.com>
Cc:     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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched/core: Skip sched_core_fork/free() when core
 sched is disabled

On Mon, Apr 25, 2022 at 04:17:34AM +0800, Cruz Zhao wrote:
> As __put_task_struct() and copy_process() are hot path functions,
> the call of sched_core_fork/free() will bring overhead when core
> sched is disabled, and we skip them in these cases.

Only if you have profile data.. mostly these functions do whole lot of
nothing.