Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus

From	Chen Yu <yu.c.chen@intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus
Date	2017-07-05 16:20 +0200
Message-ID	<tZTjR-7oP-15@gated-at.bofh.it> (permalink)
References	(1 earlier) <tOK0y-1qd-19@gated-at.bofh.it> <tZa3s-2gz-117@gated-at.bofh.it> <tZrQC-5Zf-25@gated-at.bofh.it> <tZJaO-CS-3@gated-at.bofh.it> <tZMil-2GU-3@gated-at.bofh.it>
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On Wed, Jul 05, 2017 at 08:46:08AM +0200, Thomas Gleixner wrote:
> On Wed, 5 Jul 2017, Chen Yu wrote:
> > On Tue, Jul 04, 2017 at 10:50:33AM +0200, Thomas Gleixner wrote:
> > Here's the test result for affinity:
> > # uname -r
> > 4.12.0+
> > # cat /proc/irq/32/smp_affinity
> > 00000000,80000000
> > # echo 0 > /sys/devices/system/cpu/cpu31/online 
> > # cat /proc/irq/32/smp_affinity
> > 00000000,ffffffff
> > Looks like cpu31 is till included in the irq mask.
> 
> Yes, because the offline broke affinity and now it's reset to the default
> affinity mask. /proc/irq/*/affinity is the affinity which is allowed by the
> admin, not the one which is effective.
> 
> Look at /proc/irq/32/effective_affinity to see where it's really routed to.
>
ok, got it, this is normal now.
cat /proc/irq/32/effective_affinity
00000000,00000001

Thanks,
	Yu

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Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus Chen Yu <yu.c.chen@intel.com> - 2017-07-03 16:00 +0200
  Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus Thomas Gleixner <tglx@linutronix.de> - 2017-07-04 11:00 +0200
    Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus Chen Yu <yu.c.chen@intel.com> - 2017-07-05 05:30 +0200
      Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus Thomas Gleixner <tglx@linutronix.de> - 2017-07-05 08:50 +0200
        Re: [PATCH][RFC] x86: Fix the irq affinity in fixup_cpus Chen Yu <yu.c.chen@intel.com> - 2017-07-05 16:20 +0200

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