From: Puyou Lu <puyou.lu@gmail.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Robert Richter <rrichter@cavium.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] irqchip/gic-v3: do runtime cpu cap check only when necessary
Date: Mon, 29 Aug 2022 11:52:33 +0800 [thread overview]
Message-ID: <20220829035232.GA13376@dell-PowerEdge-T440> (raw)
In-Reply-To: <87r110qong.wl-maz@kernel.org>
On Sun, Aug 28, 2022 at 06:11:15PM +0100, Marc Zyngier wrote:
> Well, what you got wrong is that these instructions are stepped over
> two branches when the caps are finalised, and that doesn't appear in
> the disassembly (you need to look at the code that is actually
> executed).
>
> Now, any optimisation of the sort must be backed by some performance
> numbers. If you can show that this has a meaningful impact on a given
> workload, I'm happy to look into it. But only if you can show that
> data.
>
> Thanks,
>
> M.
>
> --
> Without deviation from the norm, progress is not possible.
Thank you very much for correcting me, and sorry for wasting your time, I
got it now.
prev parent reply other threads:[~2022-08-29 3:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-27 5:19 [PATCH] irqchip/gic-v3: do runtime cpu cap check only when necessary Puyou Lu
2022-08-27 15:13 ` Marc Zyngier
2022-08-28 7:56 ` Puyou Lu
2022-08-28 17:11 ` Marc Zyngier
2022-08-29 3:52 ` Puyou Lu [this message]
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