linux-kernel - Re: [patch 2/3] atomics: Provide rcuref

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Message-ID: <87pm9slocp.ffs@tglx>
Date:   Wed, 01 Mar 2023 12:09:42 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...uxfoundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Wangyang Guo <wangyang.guo@...el.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [patch 2/3] atomics: Provide rcuref - scalable reference counting

On Tue, Feb 28 2023 at 16:42, Linus Torvalds wrote:
> On Tue, Feb 28, 2023 at 6:33 AM Thomas Gleixner <tglx@...utronix.de> wrote:
> This may seem like nit-picking, but I absolutely *HATE* our current
> refcount interface for how absolutely horrid the code generation ends
> up being. It's gotten better, but it's still not great.
>
> So if we're introducing yet another refcount interface, and it's done
> in the name of efficiency, I would *really* want it to actually be
> exactly that: efficient. Not some half-way thing.
>
> And yes, that may mean that it should have some architecture-specific
> code (with fallback defaults for the generic case).

Let me stare at that some more.

Thanks,

        tglx