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Date: Wed, 22 Apr 2020 17:52:55 +0200 From: Vincent Guittot <vincent.guittot@...aro.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Ingo Molnar <mingo@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Steven Rostedt <rostedt@...dmis.org>, Qais Yousef <qais.yousef@....com>, Juri Lelli <juri.lelli@...hat.com>, Dietmar Eggemann <dietmar.eggemann@....com>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, John Stultz <john.stultz@...aro.org> Subject: Re: [PATCH 13/23] sched,ion: Convert to sched_set_normal() On Wed, 22 Apr 2020 at 17:39, Peter Zijlstra <peterz@...radead.org> wrote: > > On Wed, Apr 22, 2020 at 05:09:15PM +0200, Vincent Guittot wrote: > > > It's not unbounded, like a true idle-time scheduler would be, but it can > > > still be pretty horrible. nice19 has some of that too of course, but > > > idle has it worse, esp. also because it begs others to preempt it. > > > > Yeah... you have to pay the benefit of letting other tasks to preempt > > faster. But both sched_idle and nice19 have the same weight > > #define WEIGHT_IDLEPRIO 3 > > /* 15 */ 36, 29, 23, 18, 15, > > 15 != 3 Good point Don't know why I thought they had same weight > > Also, like said elsewhere, idle is much more eager to let itself be > preempted.
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