linux-kernel - Re: [PATCH v6 2/2] sched: update the rq->avg_idle when a task is moved to an idle CPU

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Message-ID: <66c6e93c-1f9b-4252-8b28-3097565b81f3@amperemail.onmicrosoft.com>
Date: Tue, 16 Dec 2025 14:22:18 +0800
From: Shijie Huang <shijie@...eremail.onmicrosoft.com>
To: Vincent Guittot <vincent.guittot@...aro.org>,
 Huang Shijie <shijie@...amperecomputing.com>
Cc: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
 patches@...erecomputing.com, cl@...ux.com, Shubhang@...amperecomputing.com,
 dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
 mgorman@...e.de, linux-kernel@...r.kernel.org, vschneid@...hat.com,
 vineethr@...ux.ibm.com, kprateek.nayak@....com
Subject: Re: [PATCH v6 2/2] sched: update the rq->avg_idle when a task is
 moved to an idle CPU


On 13/12/2025 09:36, Vincent Guittot wrote:
> put_prev_task_idle() would be a better place to call
> update_rq_avg_idle() because this is when we leave idle.

The update_rq_avg_idle() is not only called by current CPU, but also 
called by

other CPUs. For example, the try_to_wake_up(), update_rq_avg_idle() is 
called by

the other CPUs. So enqueue_task() is a good place.


Thanks

Huang Shijie