linux-kernel - Re: [patch V4 10/20] sched/mmcid: Convert mm CID mask to a bitmap

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Message-ID: <0ca25c9d-0ffc-4693-afde-2806e2b0bc2d@efficios.com>
Date: Mon, 17 Nov 2025 11:51:34 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
 Gabriele Monaco <gmonaco@...hat.com>, Michael Jeanson
 <mjeanson@...icios.com>, Jens Axboe <axboe@...nel.dk>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 "Gautham R. Shenoy" <gautham.shenoy@....com>,
 Florian Weimer <fweimer@...hat.com>, Tim Chen <tim.c.chen@...el.com>,
 Yury Norov <yury.norov@...il.com>, Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: Re: [patch V4 10/20] sched/mmcid: Convert mm CID mask to a bitmap

On 2025-11-16 15:48, Thomas Gleixner wrote:
> This is truly a bitmap and just conveniently uses a cpumask because the
> maximum size of the bitmap is nr_cpu_ids.
> 
> But that prevents to do searches for a zero bit in a limited range, which
> is helpful to provide an efficient mechanism to consolidate the CID space
> when the number of users decreases.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Acked-by: Yury Norov (NVIDIA) <yury.norov@...il.com>

Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com