linux-kernel - Re: [PATCH v2 2/3] Mutually exclude cpu online and suspend/hibernate

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Date:	Thu, 13 Oct 2011 21:07:38 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Borislav Petkov <bp@...64.org>, Tejun Heo <tj@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"pavel@....cz" <pavel@....cz>,
	"len.brown@...el.com" <len.brown@...el.com>,
	"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 2/3] Mutually exclude cpu online and suspend/hibernate

On Thursday, October 13, 2011, Alan Stern wrote:
> On Thu, 13 Oct 2011, Borislav Petkov wrote:
> 
> > On Thu, Oct 13, 2011 at 12:06:02PM -0400, Tejun Heo wrote:
> > > I hate to sound like a broken recorder but the above patch isn't
> > > strictly correct for hot-swap cases, right?
> > 
> > hpa is working on a ucode loading solution which will take care of your
> > hotswap case too.
> 
> You know, it would be a good idea to take a step back and think about a 
> broader picture.  Suspend and hibernate need to be mutually exclusive 
> with other things as well.  The two examples which people have been 
> talking about are firmware updates (if the computer goes to sleep 
> while the firmware is being changed, it ends up as a brick) and battery 
> recharging (the CPU needs to respond quickly to temperature and charger 
> events).
> 
> There ought to be a general-purpose "prevent system sleep" mechanism 
> usable both from within the kernel and from userspace.

I have a patch for that ready, will post it later today.

Thanks,
Rafael
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