From: Thomas Gleixner <tglx@linutronix.de>
To: Chris Friesen <chris.friesen@windriver.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: IRQs in /proc/irq/* that aren't listed in /proc/interrupts?
Date: Mon, 12 Oct 2020 21:37:38 +0200 [thread overview]
Message-ID: <87wnzvp75p.fsf@nanos.tec.linutronix.de> (raw)
In-Reply-To: <c74773ba-10ff-ba3a-b144-da5c2a34c74e@windriver.com>
Chris,
On Mon, Oct 12 2020 at 12:40, Chris Friesen wrote:
> On one of my X86-64 systems /proc/interrupts starts with the following
> interrupts (per-cpu info snipped):
>
> 0: IR-IO-APIC-edge timer
> 4: IR-IO-APIC-edge serial
> 8: IR-IO-APIC-edge rtc0
> 9: IR-IO-APIC-fasteoi acpi
> 17: IR-IO-APIC-fasteoi ehci_hcd:usb1, hpilo
>
>
> On this same system /proc/irq shows these interrupts:
>
> 0-15, 17
>
> Is there any way to determine what the interrupts are that aren't listed
> in /proc/interrupts?
They are simply unused.
> Six of them are affined to all CPUs, and I'm trying to affine as many
> interrupts as possible to housekeeping CPUs to free up application
> CPUs for low-latency operations.
Affining unused and therefore disabled interrupts is a pretty pointless
exercise.
Thanks,
tglx
next prev parent reply other threads:[~2020-10-12 19:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 18:40 IRQs in /proc/irq/* that aren't listed in /proc/interrupts? Chris Friesen
2020-10-12 19:37 ` Thomas Gleixner [this message]
2020-10-13 6:21 ` Chris Friesen
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