linux-kernel - Re: [PATCH v8 03/15] futex: Add basic infrastructure for local task local hash.

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Message-ID: <20250204084135.GN7145@noisy.programming.kicks-ass.net>
Date: Tue, 4 Feb 2025 09:41:35 +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 03/15] futex: Add basic infrastructure for local task
 local hash.

On Mon, Feb 03, 2025 at 04:52:51PM +0100, Sebastian Andrzej Siewior wrote:
> On 2025-02-03 15:41:01 [+0100], Peter Zijlstra wrote:
> > Notably, I'm also still thikning about all that pending FUTEX2_NUMA
> > stuff.
> 
> With local-hash there is still room for FUTEX2_NUMA?

Yes, single process can span multiple nodes, and then you still get the
cross node contention issues.