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

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Message-ID: <20250609175251.1fc90ca5@gandalf.local.home>
Date: Mon, 9 Jun 2025 17:52:51 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Prakash Sangappa <prakash.sangappa@...cle.com>,
 "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 Mon, 9 Jun 2025 16:55:32 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> So I applied your patches and fixed up my "extend-sched.c" program to use
> your method. I booted on bare-metal PREEMPT_RT and ran:

In case anyone else wants to play, I'm attaching the source of extend-sched.c

I ran it with: sleep 5; ./extend-sched

Then switched over to cyclic test, counted to five and it was pretty
noticeable when it triggered.

To build, simply do:

  $ cd linux.git
  $ mkdir /tmp/extend
  $ cp tools/testing/selftests/rseq/rseq-abi.h /tmp/extend
  $ cd /tmp/extend

  [ download extend-sched.c here ]

  $ gcc extend-sched.c -o extend-sched


-- Steve

View attachment "extend-sched.c" of type "text/x-c++src" (9189 bytes)