linux-kernel - Re: [PATCH] hrtimers: Make hrtimer_update

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Message-ID: <b6f4b197-becb-4150-8986-2c568f7e738c@kernel.dk>
Date: Sat, 8 Feb 2025 08:18:36 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Thomas Gleixner <tglx@...utronix.de>, Nam Cao <namcao@...utronix.de>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Frederic Weisbecker <frederic@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hrtimers: Make hrtimer_update_function() less expensive

On 2/7/25 2:16 PM, Thomas Gleixner wrote:
> The sanity checks in hrtimer_update_function() are expensive for high
> frequency usage like in the io/uring code due to locking.
> 
> Hide the sanity checks behind CONFIG_PROVE_LOCKING, which has a decent
> chance to be enabled on a regular basis for testing.

Looks good to me, thanks Thomas. On my side, I always have a debug run
done with PROVE_LOCKING and KASAN, fwiw.

-- 
Jens Axboe