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Message-ID: <jhjd01eqk8m.mognet@arm.com>
Date: Mon, 19 Oct 2020 17:00:09 +0100
From: Valentin Schneider <valentin.schneider@....com>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Marc Zyngier <maz@...nel.org>,
LAK <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Russell King <linux@....linux.org.uk>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Sumit Garg <sumit.garg@...aro.org>,
Florian Fainelli <f.fainelli@...il.com>,
Gregory Clement <gregory.clement@...tlin.com>,
Andrew Lunn <andrew@...n.ch>,
Saravana Kannan <saravanak@...gle.com>,
Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 03/16] arm64: Allow IPIs to be handled as normal interrupts
Hi,
On 19/10/20 16:43, Vincent Guittot wrote:
> On Mon, 19 Oct 2020 at 15:04, Marc Zyngier <maz@...nel.org> wrote:
>> Since you are running perf, can you spot where the overhead occurs?
>
> hmm... Difficult to say because tracing the bench decreases a lot the
> result. I have pasted the perf reports.
>
<snip>
> I have only put symbol with overhead above 1%
>
> so _raw_spin_unlock_irq, schedule and __schedule seem the most
> impacted but i can't get any conclusion
>
AFAICT on TX2 you should be able to run these and get some more details
within IRQ-disabled regions:
https://lore.kernel.org/linux-arm-kernel/20200924110706.254996-1-alexandru.elisei@arm.com/
(they should be on linux-next)
> I can sent you perf.data files if you want
>
>
>>
>> Thanks,
>>
>> M.
>> --
>> Jazz is not dead. It just smells funny...
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