linux-kernel - Re: Re: [PATCH-RT sched v3 0/2] Optimize the RT group scheduling

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Message-ID: <20240716102506.GE26750@noisy.programming.kicks-ass.net>
Date: Tue, 16 Jul 2024 12:25:06 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Xavier <xavier_qy@....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, vschneid@...hat.com,
	linux-kernel@...r.kernel.org, oliver.sang@...el.com
Subject: Re: Re: [PATCH-RT sched v3 0/2] Optimize the RT group scheduling

On Tue, Jul 16, 2024 at 05:17:50PM +0800, Xavier wrote:
> 
> Hi Peter,
> 
> Your meaning is, will the RT scheduling policy be removed? I see that the
> current kernel already includes the deadline and EEVDF scheduling policies.
> I noticed that the enqueue and dequeue operations for RT are quite
> complicated, so I proposed this patch for optimization.

No, not the policy, but we would really like to completely redo the
group scheduling part for RT.

For UP it is trivial, but we're not completely sure how to best do it
for SMP yet.

Anyway, I had gotten the impression that very few people indeed were
using the RT group scheduling feature, so I was surprised so see your
patches.