linux-kernel - Re: [PATCH v8 04/15] futex: Allow automatic allocation of process wide futex hash.

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Message-ID: <20250203143602.GK7145@noisy.programming.kicks-ass.net>
Date: Mon, 3 Feb 2025 15:36:02 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: linux-kernel@...r.kernel.org,
	André Almeida <andrealmeid@...lia.com>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>, Ingo Molnar <mingo@...hat.com>,
	Juri Lelli <juri.lelli@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>
Subject: Re: [PATCH v8 04/15] futex: Allow automatic allocation of process
 wide futex hash.

On Mon, Feb 03, 2025 at 02:59:24PM +0100, Sebastian Andrzej Siewior wrote:
> Allocate a default futex hash if a task forks its first thread.

This makes it so that private futexes are *always* on the mm local hash;
there is no way to disable this.

This seems somewhat extreme.