linux-kernel - Re: [PATCH 2/6] futex: Implement FUTEX2

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Message-ID: <whmqaksbwuksdobz2fomqi3pa7btf2ucjtr3i4bz3oglidz3n2@27zggp5udztd>
Date: Sun, 27 Oct 2024 18:59:13 -0700
From: Davidlohr Bueso <dave@...olabs.net>
To: "Christoph Lameter (Ampere)" <cl@...two.org>
Cc: Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, dvhart@...radead.org, andrealmeid@...lia.com, 
	Andrew Morton <akpm@...ux-foundation.org>, urezki@...il.com, hch@...radead.org, lstoakes@...il.com, 
	Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org, linux-mm@...ck.org, 
	linux-arch@...r.kernel.org, malteskarupke@....de, llong@...hat.com
Subject: Re: [PATCH 2/6] futex: Implement FUTEX2_NUMA

On Fri, 25 Oct 2024, Christoph Lameter (Ampere) wrote:\n

>Would it be possible to follow the NUMA memory policy set up for a task
>when making these decisions? We may not need a separate FUTEX2_NUMA
>option. There are supportive functions in mm/mempolicy.c that will yield
>a node for the futex logic to use.

With numa-awareness, when would lookups ever want to be anywhere but
local? mempolicy is about allocations, futexes are not that.