linux-kernel - Re: [PATCH v2 3/3] sched/fair: break out of newidle balancing if an RT task appears

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Message-ID: <752d89013a703a2a4bd32b4be196e84a9065b060.camel@gmx.de>
Date:   Sat, 15 May 2021 10:36:19 +0200
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>,
        Scott Wood <swood@...hat.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mel Gorman <mgorman@...e.de>,
        Valentin Schneider <valentin.schneider@....com>,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 3/3] sched/fair: break out of newidle balancing if an
 RT task appears

P.S. The largest I spotted before boredom won:

     kworker/3:1-22161   [003] d...2.. 11559.111261: load_balance: NEWIDLE rq:4 lock acquired
     kworker/0:0-21137   [000] d...1.. 11559.111262: load_balance: NEWIDLE rq:4 locked - aborting
     kworker/7:1-20870   [007] d...1.. 11559.111262: load_balance: NEWIDLE rq:4 locked - aborting
           <...>-22133   [002] d...1.. 11559.111263: load_balance: NEWIDLE rq:4 locked - aborting
     kworker/6:1-22213   [006] d...1.. 11559.111263: load_balance: NEWIDLE rq:4 locked - aborting

5/8 of a 128 rq box meeting like that is.. hopefully impossible :)

	-Mike