linux-kernel - Re: [PATCH V3 4/4] Sched: Add tracepoint for sched time slice extension

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Message-ID: <20250502111044.GY4198@noisy.programming.kicks-ass.net>
Date: Fri, 2 May 2025 13:10:44 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Prakash Sangappa <prakash.sangappa@...cle.com>,
	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	mathieu.desnoyers@...icios.com, tglx@...utronix.de,
	kprateek.nayak@....com
Subject: Re: [PATCH V3 4/4] Sched: Add tracepoint for sched time slice
 extension

On Fri, May 02, 2025 at 01:02:10PM +0200, Sebastian Andrzej Siewior wrote:
> On 2025-05-02 11:14:34 [+0200], Peter Zijlstra wrote:
> > This is horrific coding style. But really why do we need this? I'm not,
> > in general, a fan of tracepoints.
> 
> I suggested a tracepoint so that we see why the NEED_RESCHED flag
> disappeared. The trace would show a wakeup, the need_resched flag would
> be set and the flag would disappear without an explanation.

Would we not see a timer_start event for the hrtick or somesuch?