[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20231205182835.DNCNokiI@linutronix.de>
Date: Tue, 5 Dec 2023 19:28:35 +0100
From: Sebastian Siewior <bigeasy@...utronix.de>
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>,
Frederic Weisbecker <frederic@...nel.org>,
Rik van Riel <riel@...riel.com>,
Steven Rostedt <rostedt@...dmis.org>,
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 17/32] timers: Introduce add_timer() variants which
modify timer flags
On 2023-12-01 10:26:39 [+0100], Anna-Maria Behnsen wrote:
> Timer might be used as pinned timer (using add_timer_on()) and later on as
> non pinned timers using add_timer(). When the NOHZ timer pull at expiry
> model is in place, TIMER_PINNED flag is required to be used whenever a
> timer needs to expire on a dedicated CPU. Flag must no be set, if
> expiration on a dedicated CPU is not required.
Slightly reworded.
| A timer might be used as a pinned timer (using add_timer_on()) and later
| on as non-pinned timer using add_timer(). When the "NOHZ timer pull at
| expiry model" is in place, the TIMER_PINNED flag is required to be used
| whenever a timer needs to expire on a dedicated CPU. Otherwise the flag
| must not be set if expiration on a dedicated CPU is not required.
> add_timer_on()'s behavior will be changed during the preparation patches
> for the NOHZ timer pull at expiry model to unconditionally set TIMER_PINNED
> flag. To be able to reset/set the flag when queueing a timer, two variants
> of add_timer() are introduced.
and here.
| add_timer_on()'s behavior will be changed during the preparation patches
| for the "NOHZ timer pull at expiry model" to unconditionally set
| TIMER_PINNED flag. To be able to clear/ set the flag when queueing a
| timer, two variants of add_timer() are introduced.
I let you be judge of this.
Sebastian
Powered by blists - more mailing lists