linux-kernel - Re: Affine issues

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Message-ID: <20130528142752.GA16951@dhcp22.suse.cz>
Date:	Tue, 28 May 2013 16:27:52 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Ryan <ryanphilips19@...glemail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Affine issues

On Mon 27-05-13 18:41:35, Ryan wrote:
> When do we get the message:
> 
> IRQ79 no longer affine to CPU1
> 
> 
> Is this a hard error?

No.

> As i understand this comes during CPU hotplug.
> 
> Can anyone explain when this happens.

AFAIU this happens when an IRQ is bound to a particular CPU(s) and the
last allowed CPU is offlined. The IRQ handling would be migrated to
another allowed CPU but if there is no such then it has to break the
affinity requirements.

> I am not interrester in IRQ79, But more interested in why this occurs?
> 
> 
> Thanks,
> Ryan
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-- 
Michal Hocko
SUSE Labs
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