linux-kernel - Re: [PATCH v2 0/3] Freezer, CPU hotplug, x86 Microcode: Fix task freezing failures

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Message-ID: <1318324674.14400.73.camel@laptop>
Date:	Tue, 11 Oct 2011 11:17:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Borislav Petkov <bp@...64.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"rjw@...k.pl" <rjw@...k.pl>, "pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"tj@...nel.org" <tj@...nel.org>, "mingo@...e.hu" <mingo@...e.hu>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"suresh.b.siddha@...el.com" <suresh.b.siddha@...el.com>,
	"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"vatsa@...ux.vnet.ibm.com" <vatsa@...ux.vnet.ibm.com>,
	"ashok.raj@...el.com" <ashok.raj@...el.com>,
	"tigran@...azian.fsnet.co.uk" <tigran@...azian.fsnet.co.uk>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 0/3] Freezer, CPU hotplug, x86 Microcode: Fix task
 freezing failures

On Mon, 2011-10-10 at 18:53 +0200, Borislav Petkov wrote:
> 
> Yes, agreed. And more: I'm still trying to understand why a test case
> like that is relevant and needs to be fixed at all. Let me re-formulate
> the question: what real world scenario(s) does the case of hibernating
> _while_ off- and onlining cores cover? Or are you simply doing kernel
> resiliency testing and thought that offlining cores while hibernating
> might make sense? 

It can happen, therefore it will. We had better deal with it.

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