linux-kernel - Re: [RFC PATCH 00/14] Introducing TIF_NOTIFY

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Date: Wed, 6 Mar 2024 10:44:50 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: linux-kernel@...r.kernel.org, "Gautham R. Shenoy" <gautham.shenoy@....com>, 
	Richard Henderson <richard.henderson@...aro.org>, Russell King <linux@...linux.org.uk>, 
	Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Ard Biesheuvel <ardb@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, x86@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 00/14] Introducing TIF_NOTIFY_IPI flag

Hi K Prateek,

I trimmed down the recipient list so we don't bounce.

On Tue, Feb 20, 2024 at 6:15 PM K Prateek Nayak <kprateek.nayak@...com> wrote:

> Same experiment was repeated on an dual socket ARM server (2 x 64C)
> which too saw a significant improvement in the ipistorm performance:
>
>   ==================================================================
>   Test          : ipistorm (modified)
>   Units         : Normalized runtime
>   Interpretation: Lower is better
>   Statistic     : AMean
>   ==================================================================
>   kernel:                               time [pct imp]
>   tip:sched/core                        1.00 [0.00]
>   tip:sched/core + TIF_NOTIFY_IPI       0.41 [59.29]

Is that a 64bit ARM64 system or really an ARM 32-bit 64-core system?

I'm confused because:

> K Prateek Nayak (10):
>   arm/thread_info: Introduce TIF_NOTIFY_IPI flag

There is no arm64 patch in the patch series.

I can perhaps test the patches on an ARM32 system but all I have is dualcore
I think.

Yours,
Linus Walleij