linux-kernel - Re: [PATCH V5 1/6] Sched: Scheduler time slice extension

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Message-ID: <DA7ED2D1-BCF3-486F-83FC-51CC8AF09FEE@oracle.com>
Date: Tue, 1 Jul 2025 00:48:30 +0000
From: Prakash Sangappa <prakash.sangappa@...cle.com>
To: Steven Rostedt <rostedt@...dmis.org>
CC: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "kprateek.nayak@....com"
	<kprateek.nayak@....com>,
        "vineethr@...ux.ibm.com" <vineethr@...ux.ibm.com>
Subject: Re: [PATCH V5 1/6] Sched: Scheduler time slice extension



> On Jun 10, 2025, at 9:40 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> On Tue, 10 Jun 2025 16:31:05 +0000
> Prakash Sangappa <prakash.sangappa@...cle.com> wrote:
> 
>> Ok, adding load also seems to increase the max latency.
> 
> Right.
> 
>> 
>> It is up to Peter to decide if scheduler time extension should be restricted to non RT threads.
> 
> Peter was against restricting it to just non RT threads because he said it
> wouldn't make a difference. He asked for benchmarks that says otherwise.
> 
> I'm now supplying the benchmarks that say it does make a difference.
> 
> Hopefully Peter will now change his mind.

Did not see a response from Peter.

I sent out  V6 version which adds a config option for this feature.
https://lore.kernel.org/all/20250701003749.50525-1-prakash.sangappa@oracle.com/

-Prakash
> 
> -- Steve