From: Felix Fietkau <nbd@nbd.name>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: perf regression after "genirq/affinity: Handle affinity setting on inactive interrupts correctly"
Date: Fri, 21 Aug 2020 19:38:44 +0200 [thread overview]
Message-ID: <c3bd7f1d-3126-d20d-67f3-2fed967a3ab9@nbd.name> (raw)
Hi Thomas,
after updating my MT7622 ARM64 device from Linux 5.4.52 to 5.4.59, perf
stopped working. Whenever I started it, I got an IRQ storm on the second
arm-pmu IRQ. After some digging, I figured out that reverting commit
9f8d3d2f79ba189ecc122d214d32396e5737963b ("genirq/affinity: Handle
affinity setting on inactive interrupts correctly") made it work again.
Without the revert, the IRQ storm triggered on CPU0 (no interrupts on
CPU1).
With the revert, IRQs fire normally on CPU1 and perf works again.
It seems that setting the IRQ affinity for the arm-pmu IRQs does not
work anymore.
Please let me know if you need me to test anything.
- Felix
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-08-21 17:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 17:38 Felix Fietkau [this message]
2020-08-21 17:49 ` perf regression after "genirq/affinity: Handle affinity setting on inactive interrupts correctly" Felix Fietkau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=c3bd7f1d-3126-d20d-67f3-2fed967a3ab9@nbd.name \
--to=nbd@nbd.name \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox