linux-kernel - Re: [tip: locking/urgent] futex: Optimize per-cpu reference counting

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Message-ID: <5cf46757-6029-4ea6-9006-5dc36b00e664@linux.ibm.com>
Date: Thu, 6 Nov 2025 20:56:11 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org
Subject: Re: [tip: locking/urgent] futex: Optimize per-cpu reference counting



On 11/6/25 5:10 PM, tip-bot2 for Peter Zijlstra wrote:
> The following commit has been merged into the locking/urgent branch of tip:
> 
> Commit-ID:     4cb5ac2626b5704ed712ac1d46b9d89fdfc12c5d
> Gitweb:        https://git.kernel.org/tip/4cb5ac2626b5704ed712ac1d46b9d89fdfc12c5d
> Author:        Peter Zijlstra <peterz@...radead.org>
> AuthorDate:    Wed, 16 Jul 2025 16:29:46 +02:00
> Committer:     Peter Zijlstra <peterz@...radead.org>
> CommitterDate: Thu, 06 Nov 2025 12:30:54 +01:00
> 
> futex: Optimize per-cpu reference counting
> 
> Shrikanth noted that the per-cpu reference counter was still some 10%
> slower than the old immutable option (which removes the reference
> counting entirely).
> 

Thanks for picking it up.