linux-kernel - Re: [PATCH v9 04/32] tracing/timers: Enhance timer

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Date: Wed, 20 Dec 2023 14:35:08 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
	John Stultz <jstultz@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <edumazet@...gle.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Rik van Riel <riel@...riel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	Giovanni Gherdovich <ggherdovich@...e.cz>,
	Lukasz Luba <lukasz.luba@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Srinivas Pandruvada <srinivas.pandruvada@...el.com>,
	K Prateek Nayak <kprateek.nayak@....com>
Subject: Re: [PATCH v9 04/32] tracing/timers: Enhance timer_start tracepoint

Le Fri, Dec 01, 2023 at 10:26:26AM +0100, Anna-Maria Behnsen a écrit :
> For starting a timer, the timer is enqueued into a bucket of the timer
> wheel. The bucket expiry is the defacto expiry of the timer but it is not
> equal the timer expiry because of increasing granularity when bucket is in
> a higher level of the wheel. To be able to figure out in a trace whether a
> timer expired in time or not, the bucket expiry time is required as well.
> 
> Add bucket expiry time to the timer_start tracepoint and thereby simplify
> the arguments.
> 
> Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>

Reviewed-by: Frederic Weisbecker <frederic@...nel.org>