linux-kernel - Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice

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Message-ID: <20250204081653.18dfe905@gandalf.local.home>
Date: Tue, 4 Feb 2025 08:16:53 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, Thomas
 Gleixner <tglx@...utronix.de>, Ankur Arora <ankur.a.arora@...cle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, linux-mm@...ck.org,
 x86@...nel.org, akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
 dave.hansen@...ux.intel.com, hpa@...or.com, juri.lelli@...hat.com,
 vincent.guittot@...aro.org, willy@...radead.org, mgorman@...e.de,
 jon.grimm@....com, bharata@....com, raghavendra.kt@....com,
 boris.ostrovsky@...cle.com, konrad.wilk@...cle.com, jgross@...e.com,
 andrew.cooper3@...rix.com, Joel Fernandes <joel@...lfernandes.org>, Vineeth
 Pillai <vineethrp@...gle.com>, Suleiman Souhlal <suleiman@...gle.com>, Ingo
 Molnar <mingo@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Clark Williams
 <clark.williams@...il.com>, bigeasy@...utronix.de, daniel.wagner@...e.com,
 joseph.salisbury@...cle.com, broonie@...il.com
Subject: Re: [RFC][PATCH 1/2] sched: Extended scheduler time slice

On Tue, 4 Feb 2025 07:51:00 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> > I'm so confused, WTF do you then need the lazy crap?

IOW, the "lazy crap" was created to solve this very issue. The holding of
sleeping spin locks interrupted by a scheduler tick. I'm just giving user
space the same feature that we gave the kernel in PREEMPT_RT.

-- Steve