linux-kernel - Re: [PATCH] sched/fair: avoid vruntime compensation for SCHED

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Message-ID: <20200820134341.GW2674@hirez.programming.kicks-ass.net>
Date:   Thu, 20 Aug 2020 15:43:41 +0200
From:   peterz@...radead.org
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Jiang Biao <benbjiang@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Jiang Biao <benbjiang@...cent.com>
Subject: Re: [PATCH] sched/fair: avoid vruntime compensation for SCHED_IDLE
 task

> That's been said, not compensating the vruntime for a sched_idle task
> makes sense for me. Even if that will only help for others task in the
> same cfs_rq

Yeah, but it is worth the extra pointer chasing and branches?

Then again, I suppose we started all that with the idle_h_nr_running
nonsense :/