From: "Bouska, Zdenek" <zdenek.bouska@siemens.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>
Cc: "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 09:38:59 +0000 [thread overview]
Message-ID: <AS1PR10MB5675F26ADC112F008B52F195EB6A9@AS1PR10MB5675.EURPRD10.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <87pm7qxrg6.ffs@tglx>
> 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.
Thank you all!
[1] https://lore.kernel.org/lkml/20170728092831.GA24839@arm.com/
Zdenek Bouska
--
Siemens, s.r.o
Siemens Advanta Development
next prev parent reply other threads:[~2023-04-27 9:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-26 12:03 Bouska, Zdenek
2023-04-26 21:29 ` Thomas Gleixner
2023-04-27 9:38 ` Bouska, Zdenek [this message]
2023-04-27 10:06 ` Will Deacon
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
-- strict thread matches above, loose matches on Subject: below --
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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