linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Message-ID: <alpine.DEB.2.00.1008041650470.6545@asgard.lang.hm>
Date:	Wed, 4 Aug 2010 16:53:37 -0700 (PDT)
From:	david@...g.hm
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	pavel@....cz, florian@...kler.org, stern@...land.harvard.edu,
	swetland@...gle.com, peterz@...radead.org, tglx@...utronix.de,
	alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

On Thu, 5 Aug 2010, Rafael J. Wysocki wrote:

> On Thursday, August 05, 2010, david@...g.hm wrote:
>>
>> My proposal would never freeze a subset of processes.
>>
>> what my proposal:
>>
>> only consider the activity of a subset of processes when deciding if we
>> should suspend or not. If the decision is to suspend, freeze everything.
>
> That alone doesn't allow you to handle the race Matthew was referring to
> (ie. wakeup event happening right after you've decided to suspend).
>
> A mechanism of making a decision alone is not sufficient, you also need a
> mechanism to avoid races between wakeup events and suspend process.
>

I thought you just posted that there was a new feature that would be able 
to abort the suspend and so that race was closed.

David Lang
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