From: Will Deacon <will@kernel.org>
To: "Bouska, Zdenek" <zdenek.bouska@siemens.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Catalin Marinas <catalin.marinas@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Kiszka, Jan" <jan.kiszka@siemens.com>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
Nishanth Menon <nm@ti.com>, Puranjay Mohan <p-mohan@ti.com>
Subject: Re: Unfair qspinlocks on ARM64 without LSE atomics => 3ms delay in interrupt handling
Date: Thu, 27 Apr 2023 11:06:57 +0100 [thread overview]
Message-ID: <20230427100656.GA10855@willie-the-truck> (raw)
In-Reply-To: <AS1PR10MB5675F26ADC112F008B52F195EB6A9@AS1PR10MB5675.EURPRD10.PROD.OUTLOOK.COM>
On Thu, Apr 27, 2023 at 09:38:59AM +0000, Bouska, Zdenek wrote:
> > Why is this interrupt handling specific? Just because it's the place
> > where you observed it?
> Yes.
>
> > So if that helps, then this needs to be addressed globaly and not with
> > some crude hack in the interrupt handling code.
> I just wrote, what helps for me. I didn't mean it as a proposal for merge.
> Sorry for confusion.
>
> I tried using Will's cpu_relax() implementation [1] everywhere but I was not
> successful with that yet. ARM64's VDSO makes it complicating and even
> if I left original cpu_relax() just in VDSO, Linux did not boot for me.
It definitely seemed to work when I posted it all those years ago, but I'm
not surprised if it needs some TLC to revive it on more recent kernels.
Will
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next prev parent reply other threads:[~2023-04-27 10:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AS1PR10MB567534190B05A4493674173BEB659@AS1PR10MB5675.EURPRD10.PROD.OUTLOOK.COM>
2023-04-26 21:29 ` Unfair qspinlocks on ARM64 without LSE atomics => 3ms delay in interrupt handling Thomas Gleixner
2023-04-27 9:38 ` Bouska, Zdenek
2023-04-27 10:06 ` Will Deacon [this message]
2023-04-27 13:14 ` Jan Kiszka
2023-04-27 13:45 ` Kurt Kanzenbach
2023-04-28 7:30 ` Sebastian Andrzej Siewior
2023-04-28 7:37 ` Kurt Kanzenbach
2023-03-24 8:43 Bouska, Zdenek
2023-03-24 17:01 ` Catalin Marinas
2023-03-24 18:09 ` Will Deacon
2023-03-28 9:39 ` Bouska, Zdenek
2023-03-27 5:44 ` Bouska, Zdenek
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